diff --git a/spec/lib/gitlab/dependency_linker/parser/gemfile_spec.rb b/spec/lib/gitlab/dependency_linker/parser/gemfile_spec.rb
index f81dbcf62da..9bfb1b13a2b 100644
--- a/spec/lib/gitlab/dependency_linker/parser/gemfile_spec.rb
+++ b/spec/lib/gitlab/dependency_linker/parser/gemfile_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails_helper'
 
 describe Gitlab::DependencyLinker::Parser::Gemfile do
diff --git a/spec/policies/commit_policy_spec.rb b/spec/policies/commit_policy_spec.rb
index 2259693cf01..41f6fb08426 100644
--- a/spec/policies/commit_policy_spec.rb
+++ b/spec/policies/commit_policy_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe CommitPolicy do
diff --git a/spec/validators/sha_validator_spec.rb b/spec/validators/sha_validator_spec.rb
index b9242ef931e..dc1539cf318 100644
--- a/spec/validators/sha_validator_spec.rb
+++ b/spec/validators/sha_validator_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe ShaValidator do