diff --git a/composer.json b/composer.json
index f85fdbf..67f72ed 100644
--- a/composer.json
+++ b/composer.json
@@ -16,13 +16,17 @@
         "react/stream": "^1.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.3 || ^6.5",
+        "phpunit/phpunit": "^9.6 || ^6.5",
         "react/event-loop": "^1.2"
     },
     "autoload": {
-        "psr-4": { "Clue\\React\\Zlib\\": "src/" }
+        "psr-4": {
+            "Clue\\React\\Zlib\\": "src/"
+        }
     },
     "autoload-dev": {
-        "psr-4": { "Clue\\Tests\\React\\Zlib\\": "tests/" }
+        "psr-4": {
+            "Clue\\Tests\\React\\Zlib\\": "tests/"
+        }
     }
 }
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 02282c3..a79a738 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- PHPUnit configuration file with new format for PHPUnit 9.3+ -->
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+<!-- PHPUnit configuration file with new format for PHPUnit 9.6+ -->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.6/phpunit.xsd"
          bootstrap="vendor/autoload.php"
          cacheResult="false"
          colors="true"
diff --git a/phpunit.xml.legacy b/phpunit.xml.legacy
index 9f69ab5..fcf24c1 100644
--- a/phpunit.xml.legacy
+++ b/phpunit.xml.legacy
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- PHPUnit configuration file with old format for PHPUnit 9.2 or older -->
+<!-- PHPUnit configuration file with old format for legacy PHPUnit -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/6.5/phpunit.xsd"
          bootstrap="vendor/autoload.php"
diff --git a/src/Compressor.php b/src/Compressor.php
index a68910a..7ced4d7 100644
--- a/src/Compressor.php
+++ b/src/Compressor.php
@@ -2,8 +2,6 @@
 
 namespace Clue\React\Zlib;
 
-use Clue\StreamFilter as Filter;
-
 /**
  * The `Compressor` class can be used to compress a stream of data.
  *
diff --git a/src/Decompressor.php b/src/Decompressor.php
index 88d13f5..ae17b26 100644
--- a/src/Decompressor.php
+++ b/src/Decompressor.php
@@ -2,8 +2,6 @@
 
 namespace Clue\React\Zlib;
 
-use Clue\StreamFilter as Filter;
-
 /**
  * The `Decompressor` class can be used to decompress a stream of data.
  *
diff --git a/tests/DelateCompressorTest.php b/tests/DeflateCompressorTest.php
similarity index 100%
rename from tests/DelateCompressorTest.php
rename to tests/DeflateCompressorTest.php