diff --git a/.travis.yml b/.travis.yml
index 8944716..2f33088 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,24 +18,24 @@ script:
 
 matrix:
   include:
-    - php: 7.1
-      env: SYMFONY_VERSION=3.4.x
-    - php: 7.1
-      env: SYMFONY_VERSION=4.3.x
     - php: 7.2
       env: SYMFONY_VERSION=3.4.x
-    - php: 7.2
-      env: SYMFONY_VERSION=4.2.x
-    - php: 7.2
-      env: SYMFONY_VERSION=4.3.x
     - php: 7.2
       env: SYMFONY_VERSION=4.4.x
     - php: 7.2
       env: SYMFONY_VERSION=5.0.x
-    - php: 7.3
-      env: SYMFONY_VERSION=4.3.x
+    - php: 7.2
+      env: SYMFONY_VERSION=5.1.x
     - php: 7.3
       env: SYMFONY_VERSION=4.4.x
     - php: 7.3
       env: SYMFONY_VERSION=5.0.x
+    - php: 7.3
+      env: SYMFONY_VERSION=5.1.x
+    - php: 7.4
+      env: SYMFONY_VERSION=4.4.x
+    - php: 7.4
+      env: SYMFONY_VERSION=5.0.x
+    - php: 7.4
+      env: SYMFONY_VERSION=5.1.x
   fast_finish: true
diff --git a/Task/TaskInterface.php b/Task/TaskInterface.php
index 80b5bbe..bd375a6 100644
--- a/Task/TaskInterface.php
+++ b/Task/TaskInterface.php
@@ -18,7 +18,6 @@ public function isDue($currentTime) : bool;
 
   /**
    * Execute the task
-   * @return mixed
    */
   public function run();
-}
\ No newline at end of file
+}
diff --git a/composer.json b/composer.json
index f308d3e..8d167d5 100644
--- a/composer.json
+++ b/composer.json
@@ -9,12 +9,12 @@
   },
   "keywords": ["cron", "task", "scheduler", "symfony", "bundle"],
   "require": {
-    "php": "^7.1",
-    "symfony/console": "~3.4|~4.0|~5.0",
-    "dragonmantank/cron-expression": "^2.3"
+    "php": "^7.2",
+    "symfony/console": "^3.4|^4.4|^5.0",
+    "dragonmantank/cron-expression": "^2.3|^3.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^7.5",
+    "phpunit/phpunit": "^8.5",
     "symfony/phpunit-bridge": "^5.0",
     "monolog/monolog": "^1.25"
   },