diff --git a/common/pyproject.toml b/common/pyproject.toml
index 8d4fcb70..cecee75b 100644
--- a/common/pyproject.toml
+++ b/common/pyproject.toml
@@ -6,21 +6,21 @@ authors = [{ name = "Trail of Bits", email = "opensource@trailofbits.com" }]
 license = "AGPL-3.0-only"
 requires-python = ">=3.12,<3.13"
 dependencies = [
-    "pydantic-settings ~=2.7.1",
+    "pydantic-settings ~=2.10.1",
     "pymongo ~=4.10.1",
     "redis ~=5.2.1",
-    "langchain-core ~=0.3.81",
-    "langchain-openai ~=0.3.30",
-    "langchain ~=0.3.27",
-    "langfuse ~=2.59.2",
+    "langchain-core ~=1.2.13",
+    "langchain-openai ~=1.1.0",
+    "langchain ~=1.2.0",
     "six ~=1.17.0",
 ]
 
 [project.optional-dependencies]
 full = [
     "protobuf>=5.0",
-    # openlit 1.36.6+ breaks langgraph ToolNode: https://github.com/openlit/openlit/issues/986
-    "openlit >=1.36.0,<1.36.6",
+    "langfuse ~=3.14.0",
+    # openlit ToolNode fix landed in 1.36.8: https://github.com/openlit/openlit/pull/991
+    "openlit >=1.36.8",
 ]
 
 
@@ -34,6 +34,11 @@ buttercup-challenge-task = "buttercup.common.challenge_task_cli:main"
 buttercup-task-registry = "buttercup.common.task_registry:task_registry_cli"
 
 
+[tool.uv]
+# openlit pins langchain<0.4.0 but hasn't updated for langchain 1.x yet.
+# Override to allow langchain 1.x; openlit core telemetry still works.
+override-dependencies = ["langchain>=1.2.0"]
+
 [tool.hatch.build.targets.wheel]
 packages = ["src/buttercup"]
 
diff --git a/common/src/buttercup/common/llm.py b/common/src/buttercup/common/llm.py
index d075a13c..9bc6473d 100644
--- a/common/src/buttercup/common/llm.py
+++ b/common/src/buttercup/common/llm.py
@@ -5,11 +5,10 @@
 from typing import Any
 
 import requests
-from langchain.callbacks.base import BaseCallbackHandler
+from langchain_core.callbacks import BaseCallbackHandler
 from langchain_core.language_models import BaseChatModel
 from langchain_core.runnables import ConfigurableField, Runnable
 from langchain_openai.chat_models import ChatOpenAI
-from langfuse.callback import CallbackHandler
 from pydantic import SecretStr
 
 logger = logging.getLogger(__name__)
@@ -80,11 +79,11 @@ def get_langfuse_callbacks() -> list[BaseCallbackHandler]:
     """Get Langchain callbacks for monitoring LLM calls with LangFuse, if available."""
     if is_langfuse_available():
         try:
-            langfuse_handler = CallbackHandler(
-                public_key=os.getenv("LANGFUSE_PUBLIC_KEY"),
-                secret_key=os.getenv("LANGFUSE_SECRET_KEY"),
-                host=os.getenv("LANGFUSE_HOST"),
-            )
+            from langfuse.langchain import CallbackHandler
+
+            # langfuse 3.x reads LANGFUSE_PUBLIC_KEY, LANGFUSE_SECRET_KEY,
+            # and LANGFUSE_HOST from env vars automatically via get_client()
+            langfuse_handler = CallbackHandler()
             if langfuse_auth_check():
                 logger.info("Tracing with LangFuse enabled")
                 return [langfuse_handler]
diff --git a/common/uv.lock b/common/uv.lock
index 93eb281f..aa580ad6 100644
--- a/common/uv.lock
+++ b/common/uv.lock
@@ -2,6 +2,9 @@ version = 1
 revision = 3
 requires-python = "==3.12.*"
 
+[manifest]
+overrides = [{ name = "langchain", specifier = ">=1.2.0" }]
+
 [[package]]
 name = "annotated-types"
 version = "0.7.0"
@@ -184,7 +187,6 @@ dependencies = [
     { name = "langchain" },
     { name = "langchain-core" },
     { name = "langchain-openai" },
-    { name = "langfuse" },
     { name = "pydantic-settings" },
     { name = "pymongo" },
     { name = "redis" },
@@ -193,6 +195,7 @@ dependencies = [
 
 [package.optional-dependencies]
 full = [
+    { name = "langfuse" },
     { name = "openlit" },
     { name = "protobuf" },
 ]
@@ -212,13 +215,13 @@ dev = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain", specifier = "~=0.3.27" },
-    { name = "langchain-core", specifier = "~=0.3.81" },
-    { name = "langchain-openai", specifier = "~=0.3.30" },
-    { name = "langfuse", specifier = "~=2.59.2" },
-    { name = "openlit", marker = "extra == 'full'", specifier = ">=1.36.0,<1.36.6" },
+    { name = "langchain", specifier = "~=1.2.0" },
+    { name = "langchain-core", specifier = "~=1.2.13" },
+    { name = "langchain-openai", specifier = "~=1.1.0" },
+    { name = "langfuse", marker = "extra == 'full'", specifier = "~=3.14.0" },
+    { name = "openlit", marker = "extra == 'full'", specifier = ">=1.36.8" },
     { name = "protobuf", marker = "extra == 'full'", specifier = ">=5.0" },
-    { name = "pydantic-settings", specifier = "~=2.7.1" },
+    { name = "pydantic-settings", specifier = "~=2.10.1" },
     { name = "pymongo", specifier = "~=4.10.1" },
     { name = "redis", specifier = "~=5.2.1" },
     { name = "six", specifier = "~=1.17.0" },
@@ -347,23 +350,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/c4/ab/09169d5a4612a5f92490806649ac8d41e3ec9129c636754575b3553f4ea4/googleapis_common_protos-1.72.0-py3-none-any.whl", hash = "sha256:4299c5a82d5ae1a9702ada957347726b167f9f8d1fc352477702a1e851ff4038", size = 297515, upload-time = "2025-11-06T18:29:13.14Z" },
 ]
 
-[[package]]
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-version = "3.3.1"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/8a/99/1cd3411c56a410994669062bd73dd58270c00cc074cac15f385a1fd91f8a/greenlet-3.3.1.tar.gz", hash = "sha256:41848f3230b58c08bb43dee542e74a2a2e34d3c59dc3076cec9151aeeedcae98", size = 184690, upload-time = "2026-01-23T15:31:02.076Z" }
-wheels = [
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-]
-
 [[package]]
 name = "griffe"
 version = "1.15.0"
@@ -580,25 +566,21 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "0.3.27"
+version = "1.2.10"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
-    { name = "langchain-text-splitters" },
-    { name = "langsmith" },
+    { name = "langgraph" },
     { name = "pydantic" },
-    { name = "pyyaml" },
-    { name = "requests" },
-    { name = "sqlalchemy" },
 ]
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+    { url = "https://files.pythonhosted.org/packages/7c/06/c3394327f815fade875724c0f6cff529777c96a1e17fea066deb997f8cf5/langchain-1.2.10-py3-none-any.whl", hash = "sha256:e07a377204451fffaed88276b8193e894893b1003e25c5bca6539288ccca3698", size = 111738, upload-time = "2026-02-10T14:56:47.985Z" },
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 [[package]]
 name = "langchain-core"
-version = "0.3.83"
+version = "1.2.17"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -610,54 +592,100 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
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 [[package]]
 name = "langchain-openai"
-version = "0.3.35"
+version = "1.1.9"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
     { name = "openai" },
     { name = "tiktoken" },
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+version = "3.14.5"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "backoff" },
+    { name = "httpx" },
+    { name = "openai" },
+    { name = "opentelemetry-api" },
+    { name = "opentelemetry-exporter-otlp-proto-http" },
+    { name = "opentelemetry-sdk" },
+    { name = "packaging" },
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 [[package]]
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+name = "langgraph"
+version = "1.0.10"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
+    { name = "langgraph-checkpoint" },
+    { name = "langgraph-prebuilt" },
+    { name = "langgraph-sdk" },
+    { name = "pydantic" },
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 [[package]]
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+]
+
 [[package]]
 name = "zipp"
 version = "3.23.0"
diff --git a/fuzzer/pyproject.toml b/fuzzer/pyproject.toml
index 67ceefcd..ae949a14 100644
--- a/fuzzer/pyproject.toml
+++ b/fuzzer/pyproject.toml
@@ -8,7 +8,7 @@ requires-python = ">=3.12,<3.13"
 dependencies = [
     "common[full]",
     "redis ~=5.2.1",
-    "pydantic-settings ~=2.7.1",
+    "pydantic-settings ~=2.10.1",
     "beautifulsoup4 ~=4.13.3",
     "lxml ~=5.3.1",
     "cxxfilt>=0.3.0",
@@ -27,6 +27,10 @@ buttercup-corpus-sync = "buttercup.fuzzing_infra.corpus_sync:main"
 buttercup-corpus-merger = "buttercup.fuzzing_infra.corpus_merger:main"
 buttercup-fuzzer-utils = "buttercup.fuzzing_infra.utils_cli:main"
 
+[tool.uv]
+# openlit pins langchain<0.4.0 but hasn't updated for langchain 1.x yet
+override-dependencies = ["langchain>=1.2.0"]
+
 [tool.uv.sources]
 common = { path = "../common", editable = true }
 
diff --git a/fuzzer/uv.lock b/fuzzer/uv.lock
index bffc7af2..afaf4e15 100644
--- a/fuzzer/uv.lock
+++ b/fuzzer/uv.lock
@@ -2,6 +2,9 @@ version = 1
 revision = 3
 requires-python = "==3.12.*"
 
+[manifest]
+overrides = [{ name = "langchain", specifier = ">=1.2.0" }]
+
 [[package]]
 name = "annotated-types"
 version = "0.7.0"
@@ -197,7 +200,6 @@ dependencies = [
     { name = "langchain" },
     { name = "langchain-core" },
     { name = "langchain-openai" },
-    { name = "langfuse" },
     { name = "pydantic-settings" },
     { name = "pymongo" },
     { name = "redis" },
@@ -206,19 +208,20 @@ dependencies = [
 
 [package.optional-dependencies]
 full = [
+    { name = "langfuse" },
     { name = "openlit" },
     { name = "protobuf" },
 ]
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain", specifier = "~=0.3.27" },
-    { name = "langchain-core", specifier = "~=0.3.81" },
-    { name = "langchain-openai", specifier = "~=0.3.30" },
-    { name = "langfuse", specifier = "~=2.59.2" },
-    { name = "openlit", marker = "extra == 'full'", specifier = ">=1.36.0,<1.36.6" },
+    { name = "langchain", specifier = "~=1.2.0" },
+    { name = "langchain-core", specifier = "~=1.2.13" },
+    { name = "langchain-openai", specifier = "~=1.1.0" },
+    { name = "langfuse", marker = "extra == 'full'", specifier = "~=3.14.0" },
+    { name = "openlit", marker = "extra == 'full'", specifier = ">=1.36.8" },
     { name = "protobuf", marker = "extra == 'full'", specifier = ">=5.0" },
-    { name = "pydantic-settings", specifier = "~=2.7.1" },
+    { name = "pydantic-settings", specifier = "~=2.10.1" },
     { name = "pymongo", specifier = "~=4.10.1" },
     { name = "redis", specifier = "~=5.2.1" },
     { name = "six", specifier = "~=1.17.0" },
@@ -364,7 +367,7 @@ requires-dist = [
     { name = "common", extras = ["full"], editable = "../common" },
     { name = "cxxfilt", specifier = ">=0.3.0" },
     { name = "lxml", specifier = "~=5.3.1" },
-    { name = "pydantic-settings", specifier = "~=2.7.1" },
+    { name = "pydantic-settings", specifier = "~=2.10.1" },
     { name = "redis", specifier = "~=5.2.1" },
 ]
 
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 ]
 
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-
 [[package]]
 name = "griffe"
 version = "1.15.0"
@@ -612,25 +598,21 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "0.3.27"
+version = "1.2.10"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
-    { name = "langchain-text-splitters" },
-    { name = "langsmith" },
+    { name = "langgraph" },
     { name = "pydantic" },
-    { name = "pyyaml" },
-    { name = "requests" },
-    { name = "sqlalchemy" },
 ]
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 [[package]]
 name = "langchain-core"
-version = "0.3.83"
+version = "1.2.17"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -642,54 +624,100 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
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 [[package]]
 name = "langchain-openai"
-version = "0.3.35"
+version = "1.1.9"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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+    { name = "opentelemetry-exporter-otlp-proto-http" },
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+    { name = "langgraph-checkpoint" },
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+    { name = "langgraph-sdk" },
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diff --git a/fuzzer_runner/uv.lock b/fuzzer_runner/uv.lock
index 73e1c8a5..e2d40c4f 100644
--- a/fuzzer_runner/uv.lock
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     { name = "langchain-core" },
     { name = "langchain-openai" },
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     { name = "pydantic-settings" },
     { name = "pymongo" },
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+    { name = "langchain-core", specifier = "~=1.2.13" },
+    { name = "langchain-openai", specifier = "~=1.1.0" },
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@@ -517,23 +507,6 @@ grpc = [
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 [[package]]
diff --git a/orchestrator/pyproject.toml b/orchestrator/pyproject.toml
index d170dd8d..23fe3742 100644
--- a/orchestrator/pyproject.toml
+++ b/orchestrator/pyproject.toml
@@ -11,7 +11,7 @@ dependencies = [
     "common[full]",
     "fastapi ~=0.128.0",
     "pydantic ~=2.11.0",
-    "pydantic-settings ~=2.7.1",
+    "pydantic-settings ~=2.10.1",
     "python-dateutil ~=2.9.0",
     "pyyaml ~=6.0.1",
     "requests ~=2.32.3",
@@ -63,6 +63,10 @@ build-backend = "hatchling.build"
 [tool.hatch.build.targets.wheel]
 packages = ["src/buttercup"]
 
+[tool.uv]
+# openlit pins langchain<0.4.0 but hasn't updated for langchain 1.x yet
+override-dependencies = ["langchain>=1.2.0"]
+
 [tool.uv.sources]
 common = { path = "../common", editable = true }
 
diff --git a/orchestrator/uv.lock b/orchestrator/uv.lock
index 28e4cf5a..47dd4fe3 100644
--- a/orchestrator/uv.lock
+++ b/orchestrator/uv.lock
@@ -2,6 +2,9 @@ version = 1
 revision = 3
 requires-python = "==3.12.*"
 
+[manifest]
+overrides = [{ name = "langchain", specifier = ">=1.2.0" }]
+
 [[package]]
 name = "annotated-doc"
 version = "0.0.4"
@@ -226,7 +229,6 @@ dependencies = [
     { name = "langchain" },
     { name = "langchain-core" },
     { name = "langchain-openai" },
-    { name = "langfuse" },
     { name = "pydantic-settings" },
     { name = "pymongo" },
     { name = "redis" },
@@ -235,19 +237,20 @@ dependencies = [
 
 [package.optional-dependencies]
 full = [
+    { name = "langfuse" },
     { name = "openlit" },
     { name = "protobuf" },
 ]
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain", specifier = "~=0.3.27" },
-    { name = "langchain-core", specifier = "~=0.3.81" },
-    { name = "langchain-openai", specifier = "~=0.3.30" },
-    { name = "langfuse", specifier = "~=2.59.2" },
-    { name = "openlit", marker = "extra == 'full'", specifier = ">=1.36.0,<1.36.6" },
+    { name = "langchain", specifier = "~=1.2.0" },
+    { name = "langchain-core", specifier = "~=1.2.13" },
+    { name = "langchain-openai", specifier = "~=1.1.0" },
+    { name = "langfuse", marker = "extra == 'full'", specifier = "~=3.14.0" },
+    { name = "openlit", marker = "extra == 'full'", specifier = ">=1.36.8" },
     { name = "protobuf", marker = "extra == 'full'", specifier = ">=5.0" },
-    { name = "pydantic-settings", specifier = "~=2.7.1" },
+    { name = "pydantic-settings", specifier = "~=2.10.1" },
     { name = "pymongo", specifier = "~=4.10.1" },
     { name = "redis", specifier = "~=5.2.1" },
     { name = "six", specifier = "~=1.17.0" },
@@ -715,25 +718,21 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "0.3.27"
+version = "1.2.10"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
-    { name = "langchain-text-splitters" },
-    { name = "langsmith" },
+    { name = "langgraph" },
     { name = "pydantic" },
-    { name = "pyyaml" },
-    { name = "requests" },
-    { name = "sqlalchemy" },
 ]
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+sdist = { url = "https://files.pythonhosted.org/packages/16/22/a4d4ac98fc2e393537130bbfba0d71a8113e6f884d96f935923e247397fe/langchain-1.2.10.tar.gz", hash = "sha256:bdcd7218d9c79a413cf15e106e4eb94408ac0963df9333ccd095b9ed43bf3be7", size = 570071, upload-time = "2026-02-10T14:56:49.74Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/7c/06/c3394327f815fade875724c0f6cff529777c96a1e17fea066deb997f8cf5/langchain-1.2.10-py3-none-any.whl", hash = "sha256:e07a377204451fffaed88276b8193e894893b1003e25c5bca6539288ccca3698", size = 111738, upload-time = "2026-02-10T14:56:47.985Z" },
 ]
 
 [[package]]
 name = "langchain-core"
-version = "0.3.83"
+version = "1.2.17"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -745,54 +744,100 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
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+sdist = { url = "https://files.pythonhosted.org/packages/1d/93/36226f593df52b871fc24d494c274f3a6b2ac76763a2806e7d35611634a1/langchain_core-1.2.17.tar.gz", hash = "sha256:54aa267f3311e347fb2e50951fe08e53761cebfb999ab80e6748d70525bbe872", size = 836130, upload-time = "2026-03-02T22:47:55.846Z" }
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 [[package]]
 name = "langchain-openai"
-version = "0.3.35"
+version = "1.1.9"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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     { name = "openai" },
     { name = "tiktoken" },
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+wheels = [
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+]
+
+[[package]]
+name = "langfuse"
+version = "3.14.5"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "backoff" },
+    { name = "httpx" },
+    { name = "openai" },
+    { name = "opentelemetry-api" },
+    { name = "opentelemetry-exporter-otlp-proto-http" },
+    { name = "opentelemetry-sdk" },
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+]
+
 [[package]]
 name = "zipp"
 version = "3.23.0"
diff --git a/patcher/pyproject.toml b/patcher/pyproject.toml
index e1b1e9e8..2f603076 100644
--- a/patcher/pyproject.toml
+++ b/patcher/pyproject.toml
@@ -8,12 +8,12 @@ license = "AGPL-3.0-only"
 requires-python = ">=3.12,<3.13"
 dependencies = [
     "common[full]",
-    "langchain-community ~=0.3.27",
-    "langgraph ~=0.6.6",
-    "langgraph-checkpoint >=3.0.0",
-    "openai ~=1.100.2",
+    "langchain-community ~=0.4.0",
+    "langgraph ~=1.0.8",
+    "langgraph-checkpoint >=4.0.0",
+    "openai ~=1.109.1",
     "program-model",
-    "pydantic-settings ~=2.7.1",
+    "pydantic-settings ~=2.10.1",
     "python-dotenv ~=1.0.1",
     "unidiff ~=0.7.5",
 ]
@@ -59,6 +59,10 @@ ignore = [
 [tool.ruff.lint.per-file-ignores]
 "tests/**/*.py" = ["S101", "D"]  # Allow asserts, no docstrings in tests
 
+[tool.uv]
+# openlit pins langchain<0.4.0 but hasn't updated for langchain 1.x yet
+override-dependencies = ["langchain>=1.2.0"]
+
 [tool.uv.sources]
 common = { path = "../common", editable = true }
 program-model = { path = "../program-model", editable = true }
diff --git a/patcher/uv.lock b/patcher/uv.lock
index 340540e5..74d8aed8 100644
--- a/patcher/uv.lock
+++ b/patcher/uv.lock
@@ -2,6 +2,9 @@ version = 1
 revision = 3
 requires-python = "==3.12.*"
 
+[manifest]
+overrides = [{ name = "langchain", specifier = ">=1.2.0" }]
+
 [[package]]
 name = "aiohappyeyeballs"
 version = "2.6.1"
@@ -240,7 +243,6 @@ dependencies = [
     { name = "langchain" },
     { name = "langchain-core" },
     { name = "langchain-openai" },
-    { name = "langfuse" },
     { name = "pydantic-settings" },
     { name = "pymongo" },
     { name = "redis" },
@@ -249,19 +251,20 @@ dependencies = [
 
 [package.optional-dependencies]
 full = [
+    { name = "langfuse" },
     { name = "openlit" },
     { name = "protobuf" },
 ]
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain", specifier = "~=0.3.27" },
-    { name = "langchain-core", specifier = "~=0.3.81" },
-    { name = "langchain-openai", specifier = "~=0.3.30" },
-    { name = "langfuse", specifier = "~=2.59.2" },
-    { name = "openlit", marker = "extra == 'full'", specifier = ">=1.36.0,<1.36.6" },
+    { name = "langchain", specifier = "~=1.2.0" },
+    { name = "langchain-core", specifier = "~=1.2.13" },
+    { name = "langchain-openai", specifier = "~=1.1.0" },
+    { name = "langfuse", marker = "extra == 'full'", specifier = "~=3.14.0" },
+    { name = "openlit", marker = "extra == 'full'", specifier = ">=1.36.8" },
     { name = "protobuf", marker = "extra == 'full'", specifier = ">=5.0" },
-    { name = "pydantic-settings", specifier = "~=2.7.1" },
+    { name = "pydantic-settings", specifier = "~=2.10.1" },
     { name = "pymongo", specifier = "~=4.10.1" },
     { name = "redis", specifier = "~=5.2.1" },
     { name = "six", specifier = "~=1.17.0" },
@@ -638,7 +641,21 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "0.3.27"
+version = "1.2.10"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "langchain-core" },
+    { name = "langgraph" },
+    { name = "pydantic" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/16/22/a4d4ac98fc2e393537130bbfba0d71a8113e6f884d96f935923e247397fe/langchain-1.2.10.tar.gz", hash = "sha256:bdcd7218d9c79a413cf15e106e4eb94408ac0963df9333ccd095b9ed43bf3be7", size = 570071, upload-time = "2026-02-10T14:56:49.74Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/7c/06/c3394327f815fade875724c0f6cff529777c96a1e17fea066deb997f8cf5/langchain-1.2.10-py3-none-any.whl", hash = "sha256:e07a377204451fffaed88276b8193e894893b1003e25c5bca6539288ccca3698", size = 111738, upload-time = "2026-02-10T14:56:47.985Z" },
+]
+
+[[package]]
+name = "langchain-classic"
+version = "1.0.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
@@ -649,20 +666,20 @@ dependencies = [
     { name = "requests" },
     { name = "sqlalchemy" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/83/f6/f4f7f3a56626fe07e2bb330feb61254dbdf06c506e6b59a536a337da51cf/langchain-0.3.27.tar.gz", hash = "sha256:aa6f1e6274ff055d0fd36254176770f356ed0a8994297d1df47df341953cec62", size = 10233809, upload-time = "2025-07-24T14:42:32.959Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7c/4b/bd03518418ece4c13192a504449b58c28afee915dc4a6f4b02622458cb1b/langchain_classic-1.0.1.tar.gz", hash = "sha256:40a499684df36b005a1213735dc7f8dca8f5eb67978d6ec763e7a49780864fdc", size = 10516020, upload-time = "2025-12-23T22:55:22.615Z" }
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+    { url = "https://files.pythonhosted.org/packages/83/0f/eab87f017d7fe28e8c11fff614f4cdbfae32baadb77d0f79e9f922af1df2/langchain_classic-1.0.1-py3-none-any.whl", hash = "sha256:131d83a02bb80044c68fedc1ab4ae885d5b8f8c2c742d8ab9e7534ad9cda8e80", size = 1040666, upload-time = "2025-12-23T22:55:21.025Z" },
 ]
 
 [[package]]
 name = "langchain-community"
-version = "0.3.27"
+version = "0.4.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "aiohttp" },
     { name = "dataclasses-json" },
     { name = "httpx-sse" },
-    { name = "langchain" },
+    { name = "langchain-classic" },
     { name = "langchain-core" },
     { name = "langsmith" },
     { name = "numpy" },
@@ -672,14 +689,14 @@ dependencies = [
     { name = "sqlalchemy" },
     { name = "tenacity" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/5c/76/200494f6de488217a196c4369e665d26b94c8c3642d46e2fd62f9daf0a3a/langchain_community-0.3.27.tar.gz", hash = "sha256:e1037c3b9da0c6d10bf06e838b034eb741e016515c79ef8f3f16e53ead33d882", size = 33237737, upload-time = "2025-07-02T18:47:02.329Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/53/97/a03585d42b9bdb6fbd935282d6e3348b10322a24e6ce12d0c99eb461d9af/langchain_community-0.4.1.tar.gz", hash = "sha256:f3b211832728ee89f169ddce8579b80a085222ddb4f4ed445a46e977d17b1e85", size = 33241144, upload-time = "2025-10-27T15:20:32.504Z" }
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+    { url = "https://files.pythonhosted.org/packages/f0/a4/c4fde67f193401512337456cabc2148f2c43316e445f5decd9f8806e2992/langchain_community-0.4.1-py3-none-any.whl", hash = "sha256:2135abb2c7748a35c84613108f7ebf30f8505b18c3c18305ffaecfc7651f6c6a", size = 2533285, upload-time = "2025-10-27T15:20:30.767Z" },
 ]
 
 [[package]]
 name = "langchain-core"
-version = "0.3.83"
+version = "1.2.17"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -691,59 +708,61 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
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 ]
 
 [[package]]
 name = "langchain-openai"
-version = "0.3.32"
+version = "1.1.9"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "langchain-core" },
     { name = "openai" },
     { name = "tiktoken" },
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 [[package]]
 name = "langchain-text-splitters"
-version = "0.3.11"
+version = "1.1.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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-version = "2.59.7"
+version = "3.14.5"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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     { name = "backoff" },
     { name = "httpx" },
-    { name = "idna" },
+    { name = "openai" },
+    { name = "opentelemetry-api" },
+    { name = "opentelemetry-exporter-otlp-proto-http" },
+    { name = "opentelemetry-sdk" },
     { name = "packaging" },
     { name = "pydantic" },
     { name = "requests" },
     { name = "wrapt" },
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 [[package]]
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-version = "0.6.11"
+version = "1.0.10"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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@@ -753,48 +772,48 @@ dependencies = [
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 [[package]]
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@@ -922,9 +941,9 @@ dependencies = [
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+    { url = "https://files.pythonhosted.org/packages/1d/2a/7dd3d207ec669cacc1f186fd856a0f61dbc255d24f6fdc1a6715d6051b0f/openai-1.109.1-py3-none-any.whl", hash = "sha256:6bcaf57086cf59159b8e27447e4e7dd019db5d29a438072fbd49c290c7e65315", size = 948627, upload-time = "2025-09-24T13:00:50.754Z" },
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 [[package]]
@@ -947,7 +966,7 @@ wheels = [
 
 [[package]]
 name = "openlit"
-version = "1.36.3"
+version = "1.37.4"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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@@ -973,14 +992,15 @@ dependencies = [
     { name = "opentelemetry-instrumentation-urllib" },
     { name = "opentelemetry-instrumentation-urllib3" },
     { name = "opentelemetry-sdk" },
+    { name = "opentelemetry-semantic-conventions" },
     { name = "pydantic" },
     { name = "requests" },
     { name = "schedule" },
     { name = "xmltodict" },
 ]
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 [[package]]
@@ -1422,12 +1442,12 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "common", extras = ["full"], editable = "../common" },
-    { name = "langchain-community", specifier = "~=0.3.27" },
-    { name = "langgraph", specifier = "~=0.6.6" },
-    { name = "langgraph-checkpoint", specifier = ">=3.0.0" },
-    { name = "openai", specifier = "~=1.100.2" },
+    { name = "langchain-community", specifier = "~=0.4.0" },
+    { name = "langgraph", specifier = "~=1.0.8" },
+    { name = "langgraph-checkpoint", specifier = ">=4.0.0" },
+    { name = "openai", specifier = "~=1.109.1" },
     { name = "program-model", editable = "../program-model" },
-    { name = "pydantic-settings", specifier = "~=2.7.1" },
+    { name = "pydantic-settings", specifier = "~=2.10.1" },
     { name = "python-dotenv", specifier = "~=1.0.1" },
     { name = "unidiff", specifier = "~=0.7.5" },
 ]
@@ -1574,15 +1594,16 @@ wheels = [
 
 [[package]]
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+version = "2.10.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "pydantic" },
     { name = "python-dotenv" },
+    { name = "typing-inspection" },
 ]
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 [[package]]
diff --git a/program-model/pyproject.toml b/program-model/pyproject.toml
index 94aae60f..6f24a224 100644
--- a/program-model/pyproject.toml
+++ b/program-model/pyproject.toml
@@ -16,6 +16,10 @@ dependencies = [
 [project.scripts]
 buttercup-program-model = "buttercup.program_model.__cli__:main"
 
+[tool.uv]
+# openlit pins langchain<0.4.0 but hasn't updated for langchain 1.x yet
+override-dependencies = ["langchain>=1.2.0"]
+
 [tool.uv.sources]
 common = { path = "../common", editable = true }
 
diff --git a/program-model/uv.lock b/program-model/uv.lock
index 353ca441..efffb831 100644
--- a/program-model/uv.lock
+++ b/program-model/uv.lock
@@ -2,6 +2,9 @@ version = 1
 revision = 3
 requires-python = "==3.12.*"
 
+[manifest]
+overrides = [{ name = "langchain", specifier = ">=1.2.0" }]
+
 [[package]]
 name = "annotated-types"
 version = "0.7.0"
@@ -184,7 +187,6 @@ dependencies = [
     { name = "langchain" },
     { name = "langchain-core" },
     { name = "langchain-openai" },
-    { name = "langfuse" },
     { name = "pydantic-settings" },
     { name = "pymongo" },
     { name = "redis" },
@@ -193,19 +195,20 @@ dependencies = [
 
 [package.optional-dependencies]
 full = [
+    { name = "langfuse" },
     { name = "openlit" },
     { name = "protobuf" },
 ]
 
 [package.metadata]
 requires-dist = [
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-    { name = "langchain-core", specifier = "~=0.3.81" },
-    { name = "langchain-openai", specifier = "~=0.3.30" },
-    { name = "langfuse", specifier = "~=2.59.2" },
-    { name = "openlit", marker = "extra == 'full'", specifier = ">=1.36.0,<1.36.6" },
+    { name = "langchain", specifier = "~=1.2.0" },
+    { name = "langchain-core", specifier = "~=1.2.13" },
+    { name = "langchain-openai", specifier = "~=1.1.0" },
+    { name = "langfuse", marker = "extra == 'full'", specifier = "~=3.14.0" },
+    { name = "openlit", marker = "extra == 'full'", specifier = ">=1.36.8" },
     { name = "protobuf", marker = "extra == 'full'", specifier = ">=5.0" },
-    { name = "pydantic-settings", specifier = "~=2.7.1" },
+    { name = "pydantic-settings", specifier = "~=2.10.1" },
     { name = "pymongo", specifier = "~=4.10.1" },
     { name = "redis", specifier = "~=5.2.1" },
     { name = "six", specifier = "~=1.17.0" },
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 [[package]]
 name = "packaging"
 version = "24.2"
@@ -1242,15 +1288,16 @@ wheels = [
 
 [[package]]
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 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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     { name = "python-dotenv" },
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 ]
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+
 [[package]]
 name = "zipp"
 version = "3.23.0"
diff --git a/seed-gen/pyproject.toml b/seed-gen/pyproject.toml
index f1fa8a14..010d3d35 100644
--- a/seed-gen/pyproject.toml
+++ b/seed-gen/pyproject.toml
@@ -14,11 +14,15 @@ dependencies = [
     "program-model",
     "numpy ~=2.2.3",
     "rapidfuzz ~=3.12.2",
-    "langgraph ~=0.6.6",
+    "langgraph ~=1.0.8",
     "python-dotenv ~=1.0.1",
 ]
 requires-python = ">=3.12,<3.13"
 
+[tool.uv]
+# openlit pins langchain<0.4.0 but hasn't updated for langchain 1.x yet
+override-dependencies = ["langchain>=1.2.0"]
+
 [tool.uv.sources]
 common = { path = "../common", editable = true }
 program-model = { path = "../program-model", editable = true }
diff --git a/seed-gen/src/buttercup/seed_gen/task.py b/seed-gen/src/buttercup/seed_gen/task.py
index 4ef7fe9c..6bd5004c 100644
--- a/seed-gen/src/buttercup/seed_gen/task.py
+++ b/seed-gen/src/buttercup/seed_gen/task.py
@@ -12,9 +12,9 @@
 from buttercup.common.project_yaml import ProjectYaml
 from buttercup.program_model.codequery import CodeQueryPersistent
 from buttercup.program_model.utils.common import Function, TypeDefinition
-from langchain.prompts import ChatPromptTemplate
 from langchain_core.language_models import BaseChatModel
 from langchain_core.messages import BaseMessage, ToolMessage
+from langchain_core.prompts import ChatPromptTemplate
 from langchain_core.tools import BaseTool, tool
 from langchain_core.tools.base import InjectedToolCallId
 from langgraph.graph import add_messages
diff --git a/seed-gen/uv.lock b/seed-gen/uv.lock
index 135883b0..63d34e79 100644
--- a/seed-gen/uv.lock
+++ b/seed-gen/uv.lock
@@ -2,6 +2,9 @@ version = 1
 revision = 3
 requires-python = "==3.12.*"
 
+[manifest]
+overrides = [{ name = "langchain", specifier = ">=1.2.0" }]
+
 [[package]]
 name = "annotated-types"
 version = "0.7.0"
@@ -184,7 +187,6 @@ dependencies = [
     { name = "langchain" },
     { name = "langchain-core" },
     { name = "langchain-openai" },
-    { name = "langfuse" },
     { name = "pydantic-settings" },
     { name = "pymongo" },
     { name = "redis" },
@@ -193,19 +195,20 @@ dependencies = [
 
 [package.optional-dependencies]
 full = [
+    { name = "langfuse" },
     { name = "openlit" },
     { name = "protobuf" },
 ]
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain", specifier = "~=0.3.27" },
-    { name = "langchain-core", specifier = "~=0.3.81" },
-    { name = "langchain-openai", specifier = "~=0.3.30" },
-    { name = "langfuse", specifier = "~=2.59.2" },
-    { name = "openlit", marker = "extra == 'full'", specifier = ">=1.36.0,<1.36.6" },
+    { name = "langchain", specifier = "~=1.2.0" },
+    { name = "langchain-core", specifier = "~=1.2.13" },
+    { name = "langchain-openai", specifier = "~=1.1.0" },
+    { name = "langfuse", marker = "extra == 'full'", specifier = "~=3.14.0" },
+    { name = "openlit", marker = "extra == 'full'", specifier = ">=1.36.8" },
     { name = "protobuf", marker = "extra == 'full'", specifier = ">=5.0" },
-    { name = "pydantic-settings", specifier = "~=2.7.1" },
+    { name = "pydantic-settings", specifier = "~=2.10.1" },
     { name = "pymongo", specifier = "~=4.10.1" },
     { name = "redis", specifier = "~=5.2.1" },
     { name = "six", specifier = "~=1.17.0" },
@@ -325,23 +328,6 @@ wheels = [
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 ]
 
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