diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index a709c44..bca7243 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -11,7 +11,6 @@ jobs:
         strategy:
             matrix:
                 php-version:
-                    - 7.2
                     - 7.3
                     - 7.4
                     - 8.0
diff --git a/build.xml b/build.xml
index 698824c..9da7f3a 100644
--- a/build.xml
+++ b/build.xml
@@ -9,7 +9,7 @@
     </target>
 
     <target name="prepare">
-        <get src="http://getcomposer.org/composer.phar" dest="build/composer.phar"/>
+        <get src="https://getcomposer.org/composer.phar" dest="build/composer.phar"/>
         <exec executable="php" failonerror="true">
             <arg value="build/composer.phar"/>
             <arg value="install"/>
diff --git a/composer.json b/composer.json
index 3251382..d0e9e1e 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
         },
         {
             "name": "Kohana World Team",
-            "email": "ga@koseven@ga"
+            "email": "ga@koseven.ga"
         }
     ],
     "autoload": {
@@ -23,9 +23,9 @@
         }
     },
     "require": {
-        "php": "^7.2|^8.0"
+        "php": "^7.3|^8.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.5"
+        "phpunit/phpunit": "^9"
     }
 }
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 1c38cb5..c3e837e 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,32 +1,30 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit backupGlobals="false"
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         backupGlobals="false"
          convertErrorsToExceptions="true"
          convertWarningsToExceptions="true"
          convertNoticesToExceptions="true"
-         bootstrap="vendor/autoload.php"
-         verbose="true"
-         colors="true"
-         timeoutForLargeTests="100">
-
-    <testsuites>
-        <testsuite name="kohanaworld/hmmmath">
-            <directory>./tests/</directory>
-        </testsuite>
-    </testsuites>
-
-    <logging>
-        <log type="coverage-html" target="build/coverage" lowUpperBound="35" highLowerBound="70"/>
-        <log type="coverage-clover" target="build/logs/clover.xml"/>
-        <log type="junit" target="build/logs/junit.xml" />
-    </logging>
-
-    <php>
-        <ini name="error_reporting" value="-1"/>
-    </php>
-
-    <filter>
-        <whitelist>
-            <directory suffix=".php">src/</directory>
-        </whitelist>
-    </filter>
+         bootstrap="vendor/autoload.php" verbose="true"
+         colors="true" timeoutForLargeTests="100"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage>
+    <include>
+      <directory suffix=".php">src/</directory>
+    </include>
+    <report>
+      <clover outputFile="build/logs/clover.xml"/>
+      <html outputDirectory="build/coverage" lowUpperBound="35" highLowerBound="70"/>
+    </report>
+  </coverage>
+  <testsuites>
+    <testsuite name="kohanaworld/hmmmath">
+      <directory>./tests/</directory>
+    </testsuite>
+  </testsuites>
+  <logging>
+    <junit outputFile="build/logs/junit.xml"/>
+  </logging>
+  <php>
+    <ini name="error_reporting" value="-1"/>
+  </php>
 </phpunit>
diff --git a/src/hmmmath/GreatestCommonDivisor/GreatestCommonDivisor.php b/src/hmmmath/GreatestCommonDivisor/GreatestCommonDivisor.php
index 4b76c43..69f332d 100644
--- a/src/hmmmath/GreatestCommonDivisor/GreatestCommonDivisor.php
+++ b/src/hmmmath/GreatestCommonDivisor/GreatestCommonDivisor.php
@@ -31,7 +31,7 @@ public static function greatestCommonDivisor(array $numbers, string $mode = self
         do {
             $right = array_shift($numbers);
 
-            if (is_infinite($right)) {
+            if (is_infinite((float) $right)) {
                 return INF;
             }
 
