diff --git a/composer.json b/composer.json
index 34f1381..794e7fe 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
     "php": ">=5.2.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "4.*|5.*"
+    "phpunit/phpunit": "*"
   },
   "suggest": {
     "ext-libsodium": "Provides a modern crypto API that can be used to generate random bytes."
diff --git a/lib/random.php b/lib/random.php
index 6df1cb0..9429ec3 100644
--- a/lib/random.php
+++ b/lib/random.php
@@ -183,7 +183,7 @@ class_exists('COM')
             try {
                 $RandomCompatCOMtest = new COM('CAPICOM.Utilities.1');
                 /** @psalm-suppress TypeDoesNotContainType */
-                if (method_exists($RandomCompatCOMtest, 'GetRandom')) {
+                if (is_callable(array($RandomCompatCOMtest, 'GetRandom'))) {
                     // See random_bytes_com_dotnet.php
                     require_once $RandomCompatDIR.DIRECTORY_SEPARATOR.'random_bytes_com_dotnet.php';
                 }
diff --git a/tests/unit/RandomBytesTest.php b/tests/unit/RandomBytesTest.php
index 4b3ab43..c6e2048 100644
--- a/tests/unit/RandomBytesTest.php
+++ b/tests/unit/RandomBytesTest.php
@@ -40,7 +40,9 @@ public function testOutput()
             random_bytes(12),
             random_bytes(64),
             random_bytes(64),
-            random_bytes(1.5)
+            PHP_VERSION_ID < 80100
+                ? random_bytes(1.5)
+                : random_bytes(1)
         );
         
         $this->assertTrue(
diff --git a/tests/unit/RandomIntTest.php b/tests/unit/RandomIntTest.php
index c8cbb0d..b6371b7 100644
--- a/tests/unit/RandomIntTest.php
+++ b/tests/unit/RandomIntTest.php
@@ -16,10 +16,14 @@ public function testOutput()
             random_int(-1000, 1000),
             random_int(~PHP_INT_MAX, PHP_INT_MAX),
             random_int("0", "1"),
-            random_int(0.11111, 0.99999),
+            PHP_VERSION_ID < 80100
+                ? random_int(0.11111, 0.99999)
+                : 0,
             random_int($half_neg_max, PHP_INT_MAX),
             random_int(0.0, 255.0),
-            random_int(-4.5, -4.5),
+            PHP_VERSION_ID < 80100
+                ? random_int(-4.5, -4.5)
+                : -4,
             random_int("1337e3","1337e3")
         );