diff --git a/runtime/gdev/src/lib.rs b/runtime/gdev/src/lib.rs
index 87ae4e486f8de4abe119dc8ab38ae222817a2a00..4fce49908f3fab30e3472d2604190c474f50657b 100644
--- a/runtime/gdev/src/lib.rs
+++ b/runtime/gdev/src/lib.rs
@@ -93,7 +93,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
     //   `spec_version`, and `authoring_version` are the same between Wasm and native.
     // This value is set to 100 to notify Polkadot-JS App (https://polkadot.js.org/apps) to use
     //   the compatible custom types.
-    spec_version: 910,
+    spec_version: 900,
     impl_version: 1,
     apis: RUNTIME_API_VERSIONS,
     transaction_version: 1,