diff --git a/renovate.json b/renovate.json
index 636d9979..25e7e3d5 100644
--- a/renovate.json
+++ b/renovate.json
@@ -37,6 +37,12 @@
       "matchPackageNames": ["celery"],
       "allowedVersions": "<5.6.0"
     },
+    {
+      "groupName": "allowed pydantic-ai-slim versions",
+      "matchManagers": ["pep621"],
+      "matchPackageNames": ["pydantic-ai-slim"],
+      "allowedVersions": "<1.59.0"
+    },
     {
       "enabled": false,
       "groupName": "ignored js dependencies",
diff --git a/src/backend/pyproject.toml b/src/backend/pyproject.toml
index 3e77f3e8..689e702d 100644
--- a/src/backend/pyproject.toml
+++ b/src/backend/pyproject.toml
@@ -57,7 +57,7 @@ dependencies = [
     "psycopg[binary]==3.3.3",
     "pycrdt==0.12.47",
     "pydantic==2.12.5",
-    "pydantic-ai-slim[openai,logfire,web]==1.63.0",
+    "pydantic-ai-slim[openai,logfire,web]==1.58.0",
     "PyJWT==2.11.0",
     "python-magic==0.4.27",
     "redis<6.0.0",