diff --git a/.travis.yml b/.travis.yml
index 4f32a1dea43..6eced4be075 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,7 +10,7 @@ php:
 - '5.3'
 - '5.4'
 - '5.5'
-- '5.6'
+- '5.6.29'
 - '7.0'
 - '7.1'
 - nightly