diff --git a/.travis.yml b/.travis.yml
index 446504d..9f4537f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,8 @@ php:
   - 7.0
   - 7.1
   - 7.2
+  - 7.3
+  - 7.4
   - nightly
 
 env:
diff --git a/composer.json b/composer.json
index 59020cd..bd92307 100644
--- a/composer.json
+++ b/composer.json
@@ -50,7 +50,7 @@
         "phpunit/phpunit" : "^5.0",
         "symfony/var-dumper": "^3.0",
         "mockery/mockery": "^0.9.4",
-        "squizlabs/php_codesniffer": "^3.0",
+        "squizlabs/php_codesniffer": "^3.5.0",
         "graze/standards": "^2.0"
     },
     "autoload": {
diff --git a/composer.lock b/composer.lock
index f1868e6..9c6c2a1 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,10 +1,10 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "b8d3a486f9ec52e968239f298b00e1ab",
+    "content-hash": "5f14999d78f7b4f246245388b8fc8b54",
     "packages": [
         {
             "name": "clue/socket-raw",
@@ -902,6 +902,7 @@
                 "mock",
                 "xunit"
             ],
+            "abandoned": true,
             "time": "2017-06-30T09:13:00+00:00"
         },
         {
@@ -1778,5 +1779,6 @@
         "ext-xmlwriter": "1.0",
         "ext-sockets": "1.0",
         "php": "5.6"
-    }
+    },
+    "plugin-api-version": "1.1.0"
 }