diff --git a/.github/renovate.json5 b/.github/renovate.json5
index 8c43294..e947c56 100644
--- a/.github/renovate.json5
+++ b/.github/renovate.json5
@@ -38,6 +38,14 @@
       "matchPackageNames": ["jiter"],
       "allowedVersions": "<0.12"
     },
+    {
+      // pydantic 2.13 bumps PyO3 to 0.28 (via pydantic-core), which drops
+      // PyPy 3.10 support. Our openai-latest test matrix still includes
+      // PyPy 3.10, so pin pydantic to the 2.12.x line until PyPy 3.10 is
+      // removed from the matrix.
+      "matchPackageNames": ["pydantic"],
+      "allowedVersions": "<2.13"
+    },
     {
       "matchUpdateTypes": ["minor", "major"],
       "schedule": ["before 8am on Monday"]
diff --git a/instrumentation/opentelemetry-instrumentation-genai-openai/tests/requirements.latest.txt b/instrumentation/opentelemetry-instrumentation-genai-openai/tests/requirements.latest.txt
index 0f4b9ac..8d50e6d 100644
--- a/instrumentation/opentelemetry-instrumentation-genai-openai/tests/requirements.latest.txt
+++ b/instrumentation/opentelemetry-instrumentation-genai-openai/tests/requirements.latest.txt
@@ -38,6 +38,7 @@
 # the newest supported version of external dependencies.
 
 openai==2.38.0
+# older pydantic is required for PyPy < 3.11
 pydantic==2.12.5
 httpx==0.28.1
 # older jiter is required for PyPy < 3.11