diff --git a/renovate.json b/renovate.json
index f63df1c1..8ac77017 100644
--- a/renovate.json
+++ b/renovate.json
@@ -10,6 +10,13 @@
         "org.jetbrains.kotlin"
       ]
     },
+    {
+      "description": "Stay on Kotlin 2.3.10, 2.4 can't compile against graphql-java 26's JSpecify annotations (#809)",
+      "matchPackagePrefixes": [
+        "org.jetbrains.kotlin:"
+      ],
+      "allowedVersions": "<=2.3.10"
+    },
     {
       "description": "Align antlr version with graphql-java",
       "matchPackagePrefixes": [