diff --git a/lib/modules/datasource/gradle-version/index.spec.ts b/lib/modules/datasource/gradle-version/index.spec.ts
index e8dbc138ead954d41eec61a896d91b93850d5f8e..cf8661684e9e57e3f63a8eaf1c225e6431bfb3be 100644
--- a/lib/modules/datasource/gradle-version/index.spec.ts
+++ b/lib/modules/datasource/gradle-version/index.spec.ts
@@ -6,7 +6,7 @@ import { ExternalHostError } from '../../../types/errors/external-host-error';
 import { id as versioning } from '../../versioning/gradle';
 import { GradleVersionDatasource } from '.';
 
-const allResponse = Fixtures?.get('all.json');
+const allResponse = Fixtures.get('all.json');
 
 let config: GetPkgReleasesConfig;
 
diff --git a/lib/modules/datasource/jenkins-plugins/index.spec.ts b/lib/modules/datasource/jenkins-plugins/index.spec.ts
index d00abf611f65d8868266b75f6ba222a590b9363e..00a0681a19eaca38ed3385a7847ebaf221c1757c 100644
--- a/lib/modules/datasource/jenkins-plugins/index.spec.ts
+++ b/lib/modules/datasource/jenkins-plugins/index.spec.ts
@@ -4,8 +4,8 @@ import * as httpMock from '../../../../test/http-mock';
 import * as versioning from '../../versioning/docker';
 import { JenkinsPluginsDatasource } from '.';
 
-const jenkinsPluginsVersions = Fixtures?.getJson('plugin-versions.json');
-const jenkinsPluginsInfo = Fixtures?.getJson('update-center.actual.json');
+const jenkinsPluginsVersions = Fixtures.getJson('plugin-versions.json');
+const jenkinsPluginsInfo = Fixtures.getJson('update-center.actual.json');
 
 describe('modules/datasource/jenkins-plugins/index', () => {
   describe('getReleases', () => {
diff --git a/lib/modules/datasource/repology/index.spec.ts b/lib/modules/datasource/repology/index.spec.ts
index 5547fa9fb321a46a9e0f5a7ea127518545410d2f..aabb1b9e800be144eeab40a5cd99dd4b4696abb7 100644
--- a/lib/modules/datasource/repology/index.spec.ts
+++ b/lib/modules/datasource/repology/index.spec.ts
@@ -48,12 +48,12 @@ const mockResolverCall = (
   }
 };
 
-const fixtureNginx = Fixtures?.get(`nginx.json`);
-const fixtureGccDefaults = Fixtures?.get(`gcc-defaults.json`);
-const fixtureGcc = Fixtures?.get(`gcc.json`);
-const fixturePulseaudio = Fixtures?.get(`pulseaudio.json`);
-const fixtureJdk = Fixtures?.get(`openjdk.json`);
-const fixturePython = Fixtures?.get(`python.json`);
+const fixtureNginx = Fixtures.get(`nginx.json`);
+const fixtureGccDefaults = Fixtures.get(`gcc-defaults.json`);
+const fixtureGcc = Fixtures.get(`gcc.json`);
+const fixturePulseaudio = Fixtures.get(`pulseaudio.json`);
+const fixtureJdk = Fixtures.get(`openjdk.json`);
+const fixturePython = Fixtures.get(`python.json`);
 
 describe('modules/datasource/repology/index', () => {
   describe('getReleases', () => {
diff --git a/lib/modules/datasource/rubygems/index.spec.ts b/lib/modules/datasource/rubygems/index.spec.ts
index e93b86154243c4be4cf83dc33e67483f920952e7..b06e839fcbdb8f280548132620d6b7ceada73ae6 100644
--- a/lib/modules/datasource/rubygems/index.spec.ts
+++ b/lib/modules/datasource/rubygems/index.spec.ts
@@ -5,10 +5,10 @@ import * as rubyVersioning from '../../versioning/ruby';
 import { resetCache } from './get-rubygems-org';
 import { RubyGemsDatasource } from '.';
 
-const rubygemsOrgVersions = Fixtures?.get('rubygems-org.txt');
-const railsInfo = Fixtures?.getJson('rails/info.json');
-const railsVersions = Fixtures?.getJson('rails/versions.json');
-const railsDependencies = Fixtures?.getBinary('dependencies-rails.dat');
+const rubygemsOrgVersions = Fixtures.get('rubygems-org.txt');
+const railsInfo = Fixtures.getJson('rails/info.json');
+const railsVersions = Fixtures.getJson('rails/versions.json');
+const railsDependencies = Fixtures.getBinary('dependencies-rails.dat');
 const emptyMarshalArray = Buffer.from([4, 8, 91, 0]);
 
 describe('modules/datasource/rubygems/index', () => {