diff --git a/lib/datasource/git-submodules/index.ts b/lib/datasource/git-submodules/index.ts
index 22a8b6adeab01338ccc981ca920735cb3eb4be5a..c085aa3dba5a4a21e75bcb94aac1e6684a9fc535 100644
--- a/lib/datasource/git-submodules/index.ts
+++ b/lib/datasource/git-submodules/index.ts
@@ -6,6 +6,10 @@ import { DigestConfig, GetReleasesConfig, ReleaseResult } from '../common';
 
 export const id = 'git-submodules';
 
+export const defaultConfig = {
+  pinDigests: false,
+};
+
 export async function getReleases({
   lookupName,
   registryUrls,