1 files changed, 4 insertions, 4 deletions
diff --git a/spec/ruby/library/prime/instance_spec.rb b/spec/ruby/library/prime/instance_spec.rb
index 5183f36901..680895eb64 100644
--- a/spec/ruby/library/prime/instance_spec.rb
+++ b/spec/ruby/library/prime/instance_spec.rb
@@ -3,12 +3,12 @@ require 'prime'
 
 describe "Prime.instance" do
   it "returns a object representing the set of prime numbers" do
-    Prime.instance.should be_kind_of(Prime)
+    Prime.instance.should.is_a?(Prime)
   end
 
   it "returns a object with no obsolete features" do
-    Prime.instance.should_not respond_to(:succ)
-    Prime.instance.should_not respond_to(:next)
+    Prime.instance.should_not.respond_to?(:succ)
+    Prime.instance.should_not.respond_to?(:next)
   end
 
   it "does not complain anything" do
@@ -16,6 +16,6 @@ describe "Prime.instance" do
   end
 
   it "raises a ArgumentError when is called with some arguments" do
-    -> { Prime.instance(1) }.should raise_error(ArgumentError)
+    -> { Prime.instance(1) }.should.raise(ArgumentError)
   end
 end