diff --git a/.travis.yml b/.travis.yml
index dad7ea5..105314f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,10 +7,6 @@ cache:
         - $HOME/.composer/cache/files
 
 php:
-    - 5.4
-    - 5.5
-    - 5.6
-    - 7.0
     - 7.1
     - 7.2
     - 7.3
@@ -26,7 +22,7 @@ branches:
 matrix:
     fast_finish: true
     include:
-        - php: 5.4
+        - php: 7.1
           env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" COVERAGE=true TEST_COMMAND="composer test-ci"
 
 before_install:
diff --git a/composer.json b/composer.json
index 8abfcf0..1e91db4 100644
--- a/composer.json
+++ b/composer.json
@@ -11,9 +11,9 @@
         }
     ],
     "require": {
-        "php": ">=5.4",
+        "php": "^7.1",
         "psr/log": "^1.0",
-        "php-http/client-common": "^1.1",
+        "php-http/client-common": "^2.0",
         "php-http/message": "^1.0"
     },
     "require-dev": {
@@ -31,6 +31,7 @@
     },
     "extra": {
         "branch-alias": {
+            "dev-2.x": "2.x-dev",
             "dev-master": "1.0-dev"
         }
     },
diff --git a/src/LoggerPlugin.php b/src/LoggerPlugin.php
index 1797d7f..43207e4 100644
--- a/src/LoggerPlugin.php
+++ b/src/LoggerPlugin.php
@@ -6,6 +6,7 @@
 use Http\Client\Exception;
 use Http\Message\Formatter;
 use Http\Message\Formatter\SimpleFormatter;
+use Http\Promise\Promise;
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Log\LoggerInterface;
@@ -30,7 +31,7 @@ public function __construct(LoggerInterface $logger, Formatter $formatter = null
     /**
      * {@inheritdoc}
      */
-    public function handleRequest(RequestInterface $request, callable $next, callable $first)
+    public function handleRequest(RequestInterface $request, callable $next, callable $first): Promise
     {
         $start = microtime(true);
         $this->logger->info(sprintf("Sending request:\n%s", $this->formatter->formatRequest($request)), ['request' => $request]);