diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 88ba116a..1679a2f9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -138,21 +138,17 @@ jobs:
       - run: mkdir junit-xml
       - run: poe test -s --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
       - run: poe test -s --workflow-environment time-skipping --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}--time-skipping.xml
-      # This must remain the last step since it downgrades pydantic
-      - name: Uninstall pydantic
-        shell: bash
-        run: |
-          echo y | uv run pip uninstall pydantic
-          echo y | uv run pip uninstall pydantic-core
-          uv run pip install pydantic==1.10
-          poe test -s --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}--pydantic-v1.xml tests/pydantic_converter_v1/workflow_test.py
+      # Pydantic 1 cannot share a virtualenv with the project's Pydantic 2, so
+      # run this one test with Pydantic 1 layered over the project environment
+      # instead of downgrading it in place. The langsmith pytest plugin needs
+      # Pydantic 2, so it is disabled for this run (its entry point is langsmith_plugin).
+      - name: Test the Pydantic v1 sample
+        run: uv run --with "pydantic>=1.10,<2" pytest -s -p no:langsmith_plugin --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}--pydantic-v1.xml tests/pydantic_converter_v1/workflow_test.py
 
-      # On latest, run gevent test
+      # Run the gevent sample's test on the newest Python in the matrix.
       - name: Gevent test
-        if: ${{ matrix.python == '3.12' }}
-        run: |
-          uv sync --group gevent
-          uv run gevent_async/test/run_combined.py
+        if: ${{ matrix.python == '3.14' }}
+        run: uv run --group gevent gevent_async/test/run_combined.py
 
       - name: Upload junit-xml artifacts
         uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7