diff --git a/composer.json b/composer.json
index 47f4a07..d97fe71 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
     "require": {
         "amphp/amp": "^2",
         "amphp/byte-stream": "^1",
-        "amphp/parallel": "^0.1"
+        "amphp/parallel": "^0.1.4"
     },
     "require-dev": {
         "amphp/phpunit-util": "^1",
diff --git a/lib/Internal/EioPoll.php b/lib/Internal/EioPoll.php
index f68d934..421f4a4 100644
--- a/lib/Internal/EioPoll.php
+++ b/lib/Internal/EioPoll.php
@@ -37,7 +37,7 @@ class EioPoll {
 
         Loop::disable($this->watcher);
 
-        Loop::setState(self::class, new class ($this->watcher) {
+        Loop::setState(self::class, new class($this->watcher) {
             private $watcher;
             private $driver;
 
diff --git a/lib/Internal/UvPoll.php b/lib/Internal/UvPoll.php
index 54d55c2..b355a2b 100644
--- a/lib/Internal/UvPoll.php
+++ b/lib/Internal/UvPoll.php
@@ -27,7 +27,7 @@ class UvPoll {
 
         Loop::disable($this->watcher);
 
-        Loop::setState(self::class, new class ($this->watcher) {
+        Loop::setState(self::class, new class($this->watcher) {
             private $watcher;
             private $driver;
 
diff --git a/lib/StatCache.php b/lib/StatCache.php
index 335a53d..3c55b5a 100644
--- a/lib/StatCache.php
+++ b/lib/StatCache.php
@@ -29,7 +29,7 @@ class StatCache {
 
         Loop::unreference($watcher);
 
-        Loop::setState(self::class, new class ($watcher) {
+        Loop::setState(self::class, new class($watcher) {
             private $watcher;
             private $driver;