diff --git a/lib/modules/datasource/hex/schema.ts b/lib/modules/datasource/hex/schema.ts
index fea85b0919da78c99f0f3ed64a8b827d3fd96068..6f5bd14b6d192bd6004f9901b686e1a4861f8ede 100644
--- a/lib/modules/datasource/hex/schema.ts
+++ b/lib/modules/datasource/hex/schema.ts
@@ -24,7 +24,7 @@ export const HexRelease = z
       .record(
         z.string(),
         z.object({
-          message: z.string(),
+          message: z.string().nullable(),
           reason: z.string(),
         }),
       )