diff --git a/.travis.yml b/.travis.yml
index 4d225e9..e96b7b9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,9 +11,11 @@ matrix:
   allow_failures:
     - rvm: ruby-head
     - rvm: "2.0"
+    - rvm: "2.1"
 rvm:
   - "2.0"
   - "2.1"
-  - "2.2"
+  - "2.2.7"
   - "2.3.4"
+  - "2.4.1"
   - ruby-head
diff --git a/spec/json_spec/matchers/have_json_type_spec.rb b/spec/json_spec/matchers/have_json_type_spec.rb
index 694683d..04a0a17 100644
--- a/spec/json_spec/matchers/have_json_type_spec.rb
+++ b/spec/json_spec/matchers/have_json_type_spec.rb
@@ -55,9 +55,10 @@
 
   it "provides a failure message for negation" do
     matcher = have_json_type(Numeric)
-    matcher.matches?(%(10))
-    matcher.failure_message_when_negated.should   eq "Expected JSON value type to not be Numeric, got Fixnum"
-    matcher.failure_message_for_should_not.should eq "Expected JSON value type to not be Numeric, got Fixnum" # RSpec 2 interface
+    matcher.matches?(%(10.0))
+
+    matcher.failure_message_when_negated.should   eq "Expected JSON value type to not be Numeric, got Float"
+    matcher.failure_message_for_should_not.should eq "Expected JSON value type to not be Numeric, got Float" # RSpec 2 interface
   end
 
   it "provides a description message" do