diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 2aca35a..d04f223 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.5.0"
+  ".": "0.5.1"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index 215938e..dea4d5c 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 14
 openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/vitable%2Fvitable-connect-e61b9afbfd2525af28aea98d7b106979d1fa2e15af61a2a14d129d64ed6a0a77.yml
 openapi_spec_hash: 0ff58ff57f78739499e3781e6bf00ba1
-config_hash: d2ce0848d5b4f2e1461c01f6eafd9b19
+config_hash: 210414fb2c2a37b4b4e772c15d0d47eb
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3165303..accd6d2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.5.1 (2026-04-08)
+
+Full Changelog: [v0.5.0...v0.5.1](https://github.com/Vitable-Inc/vitable-connect-python/compare/v0.5.0...v0.5.1)
+
+### Bug Fixes
+
+* **client:** preserve hardcoded query params when merging with user params ([a146ca8](https://github.com/Vitable-Inc/vitable-connect-python/commit/a146ca8b4396978eb085d9e35669b8de9b88eea6))
+
 ## 0.5.0 (2026-03-27)
 
 Full Changelog: [v0.4.0...v0.5.0](https://github.com/Vitable-Inc/vitable-connect-python/compare/v0.4.0...v0.5.0)
diff --git a/pyproject.toml b/pyproject.toml
index a1554e4..8be0322 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "vitable_connect"
-version = "0.5.0"
+version = "0.5.1"
 description = "The official Python library for the vitable-connect API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/vitable_connect/_base_client.py b/src/vitable_connect/_base_client.py
index 094e74e..5c2ff6e 100644
--- a/src/vitable_connect/_base_client.py
+++ b/src/vitable_connect/_base_client.py
@@ -558,6 +558,10 @@ def _build_request(
                 files = cast(HttpxRequestFiles, ForceMultipartDict())
 
         prepared_url = self._prepare_url(options.url)
+        # preserve hard-coded query params from the url
+        if params and prepared_url.query:
+            params = {**dict(prepared_url.params.items()), **params}
+            prepared_url = prepared_url.copy_with(raw_path=prepared_url.raw_path.split(b"?", 1)[0])
         if "_" in prepared_url.host:
             # work around https://github.com/encode/httpx/discussions/2880
             kwargs["extensions"] = {"sni_hostname": prepared_url.host.replace("_", "-")}
diff --git a/src/vitable_connect/_version.py b/src/vitable_connect/_version.py
index 0c2b02e..7ad0efb 100644
--- a/src/vitable_connect/_version.py
+++ b/src/vitable_connect/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "vitable_connect"
-__version__ = "0.5.0"  # x-release-please-version
+__version__ = "0.5.1"  # x-release-please-version
diff --git a/tests/test_client.py b/tests/test_client.py
index 4a271ae..2d04b70 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -429,6 +429,30 @@ def test_default_query_option(self) -> None:
 
         client.close()
 
+    def test_hardcoded_query_params_in_url(self, client: VitableConnect) -> None:
+        request = client._build_request(FinalRequestOptions(method="get", url="/foo?beta=true"))
+        url = httpx.URL(request.url)
+        assert dict(url.params) == {"beta": "true"}
+
+        request = client._build_request(
+            FinalRequestOptions(
+                method="get",
+                url="/foo?beta=true",
+                params={"limit": "10", "page": "abc"},
+            )
+        )
+        url = httpx.URL(request.url)
+        assert dict(url.params) == {"beta": "true", "limit": "10", "page": "abc"}
+
+        request = client._build_request(
+            FinalRequestOptions(
+                method="get",
+                url="/files/a%2Fb?beta=true",
+                params={"limit": "10"},
+            )
+        )
+        assert request.url.raw_path == b"/files/a%2Fb?beta=true&limit=10"
+
     def test_request_extra_json(self, client: VitableConnect) -> None:
         request = client._build_request(
             FinalRequestOptions(
@@ -1350,6 +1374,30 @@ async def test_default_query_option(self) -> None:
 
         await client.close()
 
+    async def test_hardcoded_query_params_in_url(self, async_client: AsyncVitableConnect) -> None:
+        request = async_client._build_request(FinalRequestOptions(method="get", url="/foo?beta=true"))
+        url = httpx.URL(request.url)
+        assert dict(url.params) == {"beta": "true"}
+
+        request = async_client._build_request(
+            FinalRequestOptions(
+                method="get",
+                url="/foo?beta=true",
+                params={"limit": "10", "page": "abc"},
+            )
+        )
+        url = httpx.URL(request.url)
+        assert dict(url.params) == {"beta": "true", "limit": "10", "page": "abc"}
+
+        request = async_client._build_request(
+            FinalRequestOptions(
+                method="get",
+                url="/files/a%2Fb?beta=true",
+                params={"limit": "10"},
+            )
+        )
+        assert request.url.raw_path == b"/files/a%2Fb?beta=true&limit=10"
+
     def test_request_extra_json(self, client: VitableConnect) -> None:
         request = client._build_request(
             FinalRequestOptions(