diff --git a/.travis.yml b/.travis.yml
index c05bbc5..674b66e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,7 +18,7 @@ matrix:
       env: DB=PGSQL
     - php: 7.3
       env: DB=MYSQL
-    - php: 7.3
+    - php: 7.4
       env: DB=MYSQL
 
 before_script:
diff --git a/composer.json b/composer.json
index 8a7898e..5004ffc 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,8 @@
         "silverstripe/versioned": "1.x-dev"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.7"
+        "phpunit/phpunit": "^5.7",
+        "sminnee/phpunit-mock-objects": "^3.4.5"
     },
     "extra": {
         "project-files": [
@@ -32,4 +33,4 @@
     },
     "prefer-stable": true,
     "minimum-stability": "dev"
-}
\ No newline at end of file
+}