diff --git a/.travis.yml b/.travis.yml
index c9982fd..e0b3994 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,10 +5,10 @@ cache: bundler
 script: "bundle exec rake test"
 
 rvm:
-  - 2.1
+  - 2.1.10
   - 2.2.6
-  - 2.3
-  - 2.4
+  - 2.3.3
+  - 2.4.0
 
 gemfile:
   - gemfiles/rails_4.1.gemfile
@@ -26,9 +26,9 @@ matrix:
   allow_failures:
     - gemfile: gemfiles/rails_5.1.beta.gemfile
   exclude:
-    - rvm: 2.1
+    - rvm: 2.1.10
       gemfile: gemfiles/rails_5.0.gemfile
-    - rvm: 2.1
+    - rvm: 2.1.10
       gemfile: gemfiles/rails_5.1.beta.gemfile
-    - rvm: 2.4
+    - rvm: 2.4.0
       gemfile: gemfiles/rails_4.1.gemfile