diff --git a/.travis.yml b/.travis.yml
index 6c8f892b..b87be3c0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,6 +23,7 @@ jobs:
   allow_failures:
     - php: nightly
     - env: STATIC_ANALYSIS=1
+    - env: MUTATION=1
 
   include:
     - stage: Test
diff --git a/composer.json b/composer.json
index fbc426f5..68a17948 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     },
     "require-dev": {
         "doctrine/coding-standard": "^4.0",
-        "infection/infection": "^0.8",
+        "infection/infection": "dev-master@dev",
         "mikey179/vfsStream": "^1.6",
         "phpstan/phpdoc-parser": "^0.3@dev",
         "phpstan/phpstan": "^0.10@dev",