diff --git a/.travis.yml b/.travis.yml
index b84fb633..43ea999b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,9 +7,9 @@ cache:
     - $HOME/.composer/cache
 
 php:
-  - 5.6
-  - 7.0
-  - 7.1
+  - 5.6.30
+  - 7.0.21
+  - 7.1.7
 
 matrix:
   fast_finish: true