diff --git a/lib/manager/travis/__snapshots__/extract.spec.ts.snap b/lib/manager/travis/__snapshots__/extract.spec.ts.snap
index 78b519ee6bb149af24b928516a41ec5df567cdf7..86319bb46aee98847e5d7de44f6baad5f3f258c1 100644
--- a/lib/manager/travis/__snapshots__/extract.spec.ts.snap
+++ b/lib/manager/travis/__snapshots__/extract.spec.ts.snap
@@ -4,13 +4,13 @@ exports[`manager/travis/extract extractPackageFile() returns results 1`] = `
 Object {
   "deps": Array [
     Object {
-      "currentValue": 6,
+      "currentValue": "6",
       "datasource": "github-tags",
       "depName": "node",
       "lookupName": "nodejs/node",
     },
     Object {
-      "currentValue": 8,
+      "currentValue": "8",
       "datasource": "github-tags",
       "depName": "node",
       "lookupName": "nodejs/node",
diff --git a/lib/manager/travis/extract.ts b/lib/manager/travis/extract.ts
index 178c146231bb81b31d5e8113a667c7571916a062..58ffe64021f2364037a836fc63b877aa39669178 100644
--- a/lib/manager/travis/extract.ts
+++ b/lib/manager/travis/extract.ts
@@ -19,7 +19,7 @@ export function extractPackageFile(content: string): PackageFile | null {
       depName: 'node',
       datasource: datasourceGithubTags.id,
       lookupName: 'nodejs/node',
-      currentValue,
+      currentValue: currentValue.toString(),
     }));
   }
   if (!deps.length) {
diff --git a/lib/util/cache/repository/index.ts b/lib/util/cache/repository/index.ts
index 23ac61035910f0617921cb897c7487415fa21aff..cd726ab7e034dd47c77b8da0a088f6490514a779 100644
--- a/lib/util/cache/repository/index.ts
+++ b/lib/util/cache/repository/index.ts
@@ -9,7 +9,7 @@ import { logger } from '../../../logger';
 import type { Cache } from './types';
 
 // Increment this whenever there could be incompatibilities between old and new cache structure
-export const CACHE_REVISION = 8;
+export const CACHE_REVISION = 9;
 
 let repositoryCache: RepositoryCacheConfig = 'disabled';
 let cacheFileName: string;