diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bcda378124..e852e0f25d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -104,7 +104,7 @@ jobs:
         run: uv sync --no-dev --group tests --extra all
       - name: Ensure that we have the lowest supported Pydantic version
         if: matrix.uv-resolution == 'lowest-direct'
-        run: uv pip install "pydantic==2.11.0"
+        run: uv pip install "pydantic==2.9.0"
       - name: Install Starlette from source
         if: matrix.starlette-src == 'starlette-git'
         run: uv pip install "git+https://github.com/Kludex/starlette@main"
diff --git a/pyproject.toml b/pyproject.toml
index 4c4fb2fb25..612d8a0d8a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ classifiers = [
 ]
 dependencies = [
     "starlette>=0.46.0",
-    "pydantic>=2.11.0",
+    "pydantic>=2.9.0",
     "typing-extensions>=4.8.0",
     "typing-inspection>=0.4.2",
     "annotated-doc>=0.0.2",