diff --git a/.travis.yml b/.travis.yml
index 536ef58..40261fe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,6 +24,8 @@ matrix:
       gemfile: gemfiles/railsmaster.gemfile
     - rvm: jruby-9.2.8.0
       gemfile: gemfiles/jruby.gemfile
+    - rvm: 3.0
+      gemfile: Gemfile
     - rvm: 2.7
       gemfile: Gemfile
     - rvm: 2.6.5
diff --git a/spec/clowne/declarations/after_clone_spec.rb b/spec/clowne/declarations/after_clone_spec.rb
index 9520984..b97b122 100644
--- a/spec/clowne/declarations/after_clone_spec.rb
+++ b/spec/clowne/declarations/after_clone_spec.rb
@@ -2,7 +2,7 @@
   describe ".new" do
     context "with block" do
       it "works" do
-        declaration = described_class.new { 'some block' }
+        declaration = described_class.new { "some block" }
         expect(declaration.block).to be_instance_of(Proc)
       end
     end
diff --git a/spec/clowne/declarations/after_persist_spec.rb b/spec/clowne/declarations/after_persist_spec.rb
index b707e4d..8e4bfe4 100644
--- a/spec/clowne/declarations/after_persist_spec.rb
+++ b/spec/clowne/declarations/after_persist_spec.rb
@@ -2,7 +2,7 @@
   describe ".new" do
     context "with block" do
       it "works" do
-        declaration = described_class.new { 'some block' }
+        declaration = described_class.new { "some block" }
         expect(declaration.block).to be_instance_of(Proc)
       end
     end
diff --git a/spec/clowne/declarations/finalize_spec.rb b/spec/clowne/declarations/finalize_spec.rb
index 7eae3c0..cbb6014 100644
--- a/spec/clowne/declarations/finalize_spec.rb
+++ b/spec/clowne/declarations/finalize_spec.rb
@@ -2,7 +2,7 @@
   describe ".new" do
     context "with block" do
       it "works" do
-        declaration = described_class.new { 'some block' }
+        declaration = described_class.new { "some block" }
         expect(declaration.block).to be_instance_of(Proc)
       end
     end
diff --git a/spec/clowne/declarations/init_as_spec.rb b/spec/clowne/declarations/init_as_spec.rb
index 8c94f3e..129ebcf 100644
--- a/spec/clowne/declarations/init_as_spec.rb
+++ b/spec/clowne/declarations/init_as_spec.rb
@@ -2,7 +2,7 @@
   describe ".new" do
     context "with block" do
       it "works" do
-        declaration = described_class.new { 'some block' }
+        declaration = described_class.new { "some block" }
         expect(declaration.block).to be_instance_of(Proc)
       end
     end