diff --git a/lib/manager/regex/__snapshots__/index.spec.ts.snap b/lib/manager/regex/__snapshots__/index.spec.ts.snap
index a2104cfc95133a863f22185ad3935f89da14fb11..5aa0872b4c45a74bc7ff6cd1dee670eb89f7828d 100644
--- a/lib/manager/regex/__snapshots__/index.spec.ts.snap
+++ b/lib/manager/regex/__snapshots__/index.spec.ts.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`manager/custom/extract extracts multiple dependencies 1`] = `
+exports[`manager/regex/index extracts multiple dependencies 1`] = `
 Object {
   "deps": Array [
     Object {
diff --git a/lib/manager/regex/index.spec.ts b/lib/manager/regex/index.spec.ts
index 71cc814ae8cfebf1f823547c38af045f75e08149..e63a83cd9eba1aff8b53297ee7399e201ef11e02 100644
--- a/lib/manager/regex/index.spec.ts
+++ b/lib/manager/regex/index.spec.ts
@@ -1,12 +1,18 @@
 import { readFileSync } from 'fs';
 import { resolve } from 'path';
-import { extractPackageFile } from '.';
+import { extractPackageFile, defaultConfig } from '.';
+import { getName } from '../../../test/util';
 
 const dockerfileContent = readFileSync(
   resolve(__dirname, `./__fixtures__/Dockerfile`),
   'utf8'
 );
-describe('manager/custom/extract', () => {
+describe(getName(__filename), () => {
+  it('has default config', () => {
+    expect(defaultConfig).toEqual({
+      pinDigests: false,
+    });
+  });
   it('extracts multiple dependencies', async () => {
     const config = {
       matchStrings: [
diff --git a/lib/manager/regex/index.ts b/lib/manager/regex/index.ts
index df4fd51c514c0868f21d200b827ba6c748185217..131645fd785ee0b8fad8c363935444252251ce68 100644
--- a/lib/manager/regex/index.ts
+++ b/lib/manager/regex/index.ts
@@ -5,7 +5,9 @@ import { logger } from '../../logger';
 
 export const autoReplace = true;
 
-export const defaultConfig = {};
+export const defaultConfig = {
+  pinDigests: false,
+};
 
 export function extractPackageFile(
   content: string,