diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4538e90..018f221 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -12,12 +12,13 @@ on:
 
 jobs:
   build:
-    name: ${{ matrix.os }} py${{ matrix.python-version }}
+    name: ${{ matrix.os }} py${{ matrix.python-version }}${{ format(' ({0})', matrix.resolution)}}
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         python-version: ['3.10', '3.14']
+        resolution: ['lowest', 'highest']
 
     steps:
       - uses: actions/checkout@v4
@@ -55,9 +56,9 @@ jobs:
         uses: actions/cache@v4
         with:
           path: ~/.cache/uv
-          key: ${{ runner.os }}-py${{ matrix.python-version }}-uv-${{ hashFiles('**/pyproject.toml') }}
+          key: ${{ runner.os }}-py${{ matrix.python-version }}-uv-${{ matrix.resolution }}-${{ hashFiles('**/pyproject.toml') }}
           restore-keys: |
-            ${{ runner.os }}-py${{ matrix.python-version }}-uv-
+            ${{ runner.os }}-py${{ matrix.python-version }}-uv-${{ matrix.resolution }}-
 
       - name: Set up uv
         run: |
@@ -68,12 +69,10 @@ jobs:
         run: |
           uv tool install prysk
 
-      - name: Set up jgo
-        run: |
-          uv tool install --with-editable ".[cli]" jgo
-
       - name: Run tests
         shell: bash
+        env:
+          UV_RESOLUTION: ${{ matrix.resolution }}
         run: |
           bin/test.sh
 
diff --git a/Makefile b/Makefile
index ed6f369..865976c 100644
--- a/Makefile
+++ b/Makefile
@@ -4,6 +4,7 @@ help:
 		docs  - build documentation site locally\n\
 		lint  - run code formatters and linters\n\
 		test  - run automated test suite\n\
+		test-lowest - run tests with lowest dependency resolution\n\
 		dist  - generate release archives\n\
 	"
 
@@ -22,7 +23,10 @@ lint: check
 test: check
 	bin/test.sh
 
+test-lowest: check
+	UV_RESOLUTION=lowest bin/test.sh
+
 dist: check clean
 	bin/dist.sh
 
-.PHONY: help clean docs check lint test dist
+.PHONY: help clean docs check lint test test-lowest dist
diff --git a/bin/test.sh b/bin/test.sh
index 940ceb5..d426b2d 100755
--- a/bin/test.sh
+++ b/bin/test.sh
@@ -41,23 +41,5 @@ if [ ${#pytest_args[@]} -gt 0 ]; then
   fi
 fi
 
-# Run prysk if we have args and prysk is installed
-if [ ${#prysk_args[@]} -gt 0 ] && command -v prysk; then
-  # NB: We cannot add prysk to pyproject.toml because
-  # prysk depends on an incompatible version of rich.
-  # Use `uv tool install prysk` instead.
-  #
-  # We set COLOR=never by default to avoid ANSI codes in test output.
-  # We set NO_PROGRESS=1 to disable progress bars in test output.
-  # This is especially important for CI, which may or may not detect
-  # as ANSI-color-compatible compared to local usage of prysk.
-  # Tests can override this (e.g., color.t does).
-  COLOR="${COLOR:-never}" NO_PROGRESS="${NO_PROGRESS:-1}" prysk -v "${prysk_args[@]}"
-  prysk_status=$?
-  if [ $prysk_status -ne 0 ]; then
-    exit_status=$prysk_status
-  fi
-fi
-
 # Exit with appropriate status
 exit $exit_status
diff --git a/pyproject.toml b/pyproject.toml
index 2820d8e..d3a8872 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,34 +37,32 @@ classifiers = [
 requires-python = ">=3.10"
 dependencies = [
   "cjdk>=0.4.0",
-  "psutil",
-  "requests",
+  "psutil>=7",
+  # Previous versions vendored urllib3/packages/six.py, resulting in failures
+  "requests>=2.16.0",
   "semver>=3.0.0",
   "tomli>=2.0.0; python_version<'3.11'",
   "tomli-w>=1.0.0",
-]
-
-[project.optional-dependencies]
-cli = [
-  "rich>=14.2.0",
-  "rich-click>=1.9.5",
+  "urllib3>=2",
 ]
 
 [dependency-groups]
 cli = [
-    "rich>=14.2.0",
+    "rich>=13.3.1",
     "rich-click>=1.9.5",
 ]
 dev = [
-    "build",
-    "mypy",
-    "pytest",
-    "ruff",
-    "types-Pygments",
-    "types-colorama",
-    "types-psutil",
-    "types-requests",
-    "validate-pyproject[all]",
+    "build>=1.2.2",
+    "mypy>=1.20.2",
+    "prysk>=0.20.0",
+    "pytest>=9.0.3",
+    "pytest-prysk>=0.4.0",
+    "ruff>=0.15.12",
+    "types-Pygments>=2.20.0",
+    "types-colorama>=0.4.15",
+    "types-psutil>=7.2.2",
+    "types-requests>=2.33.0",
+    "validate-pyproject[all]>=0.25",
     {include-group = "cli"},
 ]
 
diff --git a/tests/conftest.py b/tests/conftest.py
index 93838ad..f8df3df 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,5 +1,6 @@
 """Pytest configuration and shared fixtures."""
 
+import os
 import shutil
 import subprocess
 from pathlib import Path
@@ -12,6 +13,20 @@
 _BOOTSTRAP_SENTINEL = Path(".cache/m2_repo/.bootstrapped")
 
 
+@pytest.fixture(scope="session", autouse=True)
+def prysk_env():
+    """Set default env vars for prysk tests, matching the old shell script invocation."""
+    old = {k: os.environ.get(k) for k in ("COLOR", "NO_PROGRESS")}
+    os.environ.setdefault("COLOR", "never")
+    os.environ.setdefault("NO_PROGRESS", "1")
+    yield
+    for k, v in old.items():
+        if v is None:
+            os.environ.pop(k, None)
+        else:
+            os.environ[k] = v
+
+
 @pytest.fixture(scope="session")
 def thicket_poms(tmp_path_factory):
     """