diff --git a/.travis.yml b/.travis.yml
index 028d624..b4d1d20 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,7 +19,7 @@ addons:
 
 cache:
   directories:
-    - /home/travis/.rvm/gems/ruby-2.6.4
+    - /home/travis/.rvm/gems/ruby-2.6.3
 
 install: ./ci/build.sh