diff --git a/.travis.yml b/.travis.yml
index 3217714..90365d5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,11 +16,11 @@ php:
 matrix:
   include:
   - php: 5.6
-    env: BRANCH=1.6.1.1 COMPOSER_IN_TESTS=1
+    env: BRANCH=1.6.1.24 COMPOSER_IN_TESTS=1
   - php: 7.0
-    env: BRANCH=1.6.1.1 COMPOSER_IN_TESTS=1
+    env: BRANCH=1.6.1.24 COMPOSER_IN_TESTS=1
   - php: 7.1
-    env: BRANCH=1.6.1.1 COMPOSER_IN_TESTS=1
+    env: BRANCH=1.6.1.24 COMPOSER_IN_TESTS=1
 
 before_script: make before_script