diff --git a/rubocop/rspec.yml b/rubocop/rspec.yml
index c129a663..8ca037ed 100644
--- a/rubocop/rspec.yml
+++ b/rubocop/rspec.yml
@@ -2,6 +2,10 @@ RSpec/ExampleLength:
   Enabled: true
   Max: 10
 
+RSpec/ExpectChange:
+  Enabled: true
+  EnforcedStyle: block
+
 RSpec/MultipleExpectations:
   Enabled: false
 
diff --git a/spec/lib/sidekiq/throttled/config_spec.rb b/spec/lib/sidekiq/throttled/config_spec.rb
index 47662faa..6503f5f7 100644
--- a/spec/lib/sidekiq/throttled/config_spec.rb
+++ b/spec/lib/sidekiq/throttled/config_spec.rb
@@ -24,12 +24,12 @@
 
     it "fails if given value is neither `NilClass` nor `Float`" do
       expect { config.cooldown_period = 42 }
-        .to raise_error(TypeError, /unexpected type/)
+        .to raise_error(TypeError, %r{unexpected type})
     end
 
     it "fails if given value is not positive" do
       expect { config.cooldown_period = 0.0 }
-        .to raise_error(ArgumentError, /must be positive/)
+        .to raise_error(ArgumentError, %r{must be positive})
     end
   end
 
@@ -47,12 +47,12 @@
 
     it "fails if given value is not `Integer`" do
       expect { config.cooldown_threshold = 42.0 }
-        .to raise_error(TypeError, /unexpected type/)
+        .to raise_error(TypeError, %r{unexpected type})
     end
 
     it "fails if given value is not positive" do
       expect { config.cooldown_threshold = 0 }
-        .to raise_error(ArgumentError, /must be positive/)
+        .to raise_error(ArgumentError, %r{must be positive})
     end
   end
 end