diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4df4ed02317e5c10edf948afa90cd6f642e56736..dbc29c23b7c70df2955425dcb2e073066e6472df 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -37,7 +37,7 @@ PHPunit:PHP5.3:MySQL:
     - phpunit
 
 PHPunit:PHP5.6:MySQL:
-  image: php:5.6-alpine
+  image: php:5.6-stretch
   services:
     - mysql:5.6
   script:
@@ -46,7 +46,7 @@ PHPunit:PHP5.6:MySQL:
     - phpunit
 
 PHPunit:PHP7.0:MySQL:
-  image: php:7.0-alpine
+  image: php:7.0-stretch
   services:
     - mysql:5.6
   script:
@@ -55,7 +55,7 @@ PHPunit:PHP7.0:MySQL:
     - phpunit
 
 PHPunit:PHP7.1:MySQL:
-  image: php:7.1-alpine
+  image: php:7.1-stretch
   services:
     - mysql:5.6
   script:
@@ -64,7 +64,7 @@ PHPunit:PHP7.1:MySQL:
     - phpunit
 
 PHPunit:PHP7.2:MySQL:
-  image: php:7.2-alpine
+  image: php:7.2-stretch
   services:
     - mysql:5.6
   script: