diff --git a/lib/modules/versioning/gradle/index.spec.ts b/lib/modules/versioning/gradle/index.spec.ts
index 34c4be3be0c282..e11de0e3336c9e 100644
--- a/lib/modules/versioning/gradle/index.spec.ts
+++ b/lib/modules/versioning/gradle/index.spec.ts
@@ -181,6 +181,7 @@ describe('modules/versioning/gradle/index', () => {
     ${'Hoxton.SR'}                          | ${true}
     ${'Hoxton.SR1'}                         | ${true}
     ${'1.3.5-native-mt-1.3.71-release-429'} | ${false}
+    ${'1.0-dev'}                            | ${false}
   `('isStable("$input") === $expected', ({ input, expected }) => {
     expect(api.isStable(input)).toBe(expected);
   });
diff --git a/lib/modules/versioning/gradle/index.ts b/lib/modules/versioning/gradle/index.ts
index 5cfbc9e011cf72..b0565d60ad4fd7 100644
--- a/lib/modules/versioning/gradle/index.ts
+++ b/lib/modules/versioning/gradle/index.ts
@@ -75,6 +75,7 @@ const getPatch = (version: string): number | null => {
 const isGreaterThan = (a: string, b: string): boolean => compare(a, b) === 1;
 
 const unstable = new Set([
+  'dev',
   'a',
   'alpha',
   'b',