diff --git a/tests/DnsConnectorTest.php b/tests/DnsConnectorTest.php
index 15ba1a7..41fdb55 100644
--- a/tests/DnsConnectorTest.php
+++ b/tests/DnsConnectorTest.php
@@ -293,8 +293,9 @@ public function testRejectionDuringDnsLookupShouldNotCreateAnyGarbageReferences(
             $this->markTestSkipped('Not supported on legacy Promise v1 API');
         }
 
-        gc_collect_cycles();
-        gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $dns = new Deferred();
         $this->resolver->expects($this->once())->method('resolve')->with($this->equalTo('example.com'))->willReturn($dns->promise());
@@ -316,7 +317,9 @@ public function testRejectionAfterDnsLookupShouldNotCreateAnyGarbageReferences()
             $this->markTestSkipped('Not supported on legacy Promise v1 API');
         }
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $dns = new Deferred();
         $this->resolver->expects($this->once())->method('resolve')->with($this->equalTo('example.com'))->willReturn($dns->promise());
@@ -341,7 +344,9 @@ public function testRejectionAfterDnsLookupShouldNotCreateAnyGarbageReferencesAg
             $this->markTestSkipped('Not supported on legacy Promise v1 API');
         }
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $dns = new Deferred();
         $this->resolver->expects($this->once())->method('resolve')->with($this->equalTo('example.com'))->willReturn($dns->promise());
@@ -369,7 +374,9 @@ public function testCancelDuringDnsLookupShouldNotCreateAnyGarbageReferences()
             $this->markTestSkipped('Not supported on legacy Promise v1 API');
         }
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $dns = new Deferred(function () {
             throw new \RuntimeException();
@@ -391,7 +398,9 @@ public function testCancelDuringTcpConnectionShouldNotCreateAnyGarbageReferences
             $this->markTestSkipped('Not supported on legacy Promise v1 API');
         }
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $dns = new Deferred();
         $this->resolver->expects($this->once())->method('resolve')->with($this->equalTo('example.com'))->willReturn($dns->promise());
diff --git a/tests/IntegrationTest.php b/tests/IntegrationTest.php
index fec5810..4d9c804 100644
--- a/tests/IntegrationTest.php
+++ b/tests/IntegrationTest.php
@@ -126,8 +126,9 @@ public function testCancellingPendingConnectionWithoutTimeoutShouldNotCreateAnyG
 
         $connector = new Connector(array('timeout' => false));
 
-        gc_collect_cycles();
-        gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $promise = $connector->connect('8.8.8.8:80');
         $promise->cancel();
@@ -144,7 +145,10 @@ public function testCancellingPendingConnectionShouldNotCreateAnyGarbageReferenc
 
         $connector = new Connector(array());
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
+
         $promise = $connector->connect('8.8.8.8:80');
         $promise->cancel();
         unset($promise);
@@ -167,7 +171,9 @@ public function testWaitingForRejectedConnectionShouldNotCreateAnyGarbageReferen
 
         $connector = new Connector(array('timeout' => false));
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $wait = true;
         $promise = $connector->connect('127.0.0.1:1')->then(
@@ -201,7 +207,9 @@ public function testWaitingForConnectionTimeoutDuringDnsLookupShouldNotCreateAny
 
         $connector = new Connector(array('timeout' => 0.001));
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $wait = true;
         $promise = $connector->connect('google.com:80')->then(
@@ -232,7 +240,9 @@ public function testWaitingForConnectionTimeoutDuringTcpConnectionShouldNotCreat
 
         $connector = new Connector(array('timeout' => 0.000001));
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $wait = true;
         $promise = $connector->connect('8.8.8.8:53')->then(
@@ -263,7 +273,9 @@ public function testWaitingForInvalidDnsConnectionShouldNotCreateAnyGarbageRefer
 
         $connector = new Connector(array('timeout' => false));
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $wait = true;
         $promise = $connector->connect('example.invalid:80')->then(
@@ -304,7 +316,9 @@ public function testWaitingForInvalidTlsConnectionShouldNotCreateAnyGarbageRefer
             )
         ));
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $wait = true;
         $promise = $connector->connect('tls://self-signed.badssl.com:443')->then(
@@ -338,7 +352,10 @@ public function testWaitingForSuccessfullyClosedConnectionShouldNotCreateAnyGarb
 
         $connector = new Connector(array('timeout' => false));
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
+
         $promise = $connector->connect('google.com:80')->then(
             function ($conn) {
                 $conn->close();
diff --git a/tests/SecureConnectorTest.php b/tests/SecureConnectorTest.php
index cfd0977..e81f4a9 100644
--- a/tests/SecureConnectorTest.php
+++ b/tests/SecureConnectorTest.php
@@ -258,14 +258,15 @@ public function testRejectionDuringConnectionShouldNotCreateAnyGarbageReferences
             $this->markTestSkipped('Not supported on legacy Promise v1 API');
         }
 
-        gc_collect_cycles();
-        gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $tcp = new Deferred();
         $this->tcp->expects($this->once())->method('connect')->willReturn($tcp->promise());
 
         $promise = $this->connector->connect('example.com:80');
-        
+
         $promise->then(null, $this->expectCallableOnce()); // avoid reporting unhandled rejection
 
         $tcp->reject(new \RuntimeException());
@@ -280,7 +281,9 @@ public function testRejectionDuringTlsHandshakeShouldNotCreateAnyGarbageReferenc
             $this->markTestSkipped('Not supported on legacy Promise v1 API');
         }
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $connection = $this->getMockBuilder('React\Socket\Connection')->disableOriginalConstructor()->getMock();
 
diff --git a/tests/TcpConnectorTest.php b/tests/TcpConnectorTest.php
index ede2070..fb6f871 100644
--- a/tests/TcpConnectorTest.php
+++ b/tests/TcpConnectorTest.php
@@ -372,8 +372,9 @@ public function testCancelDuringConnectionShouldNotCreateAnyGarbageReferences()
             $this->markTestSkipped('Not supported on legacy Promise v1 API');
         }
 
-        gc_collect_cycles();
-        gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $loop = $this->getMockBuilder('React\EventLoop\LoopInterface')->getMock();
         $connector = new TcpConnector($loop);
diff --git a/tests/TimeoutConnectorTest.php b/tests/TimeoutConnectorTest.php
index fa97de4..fc218c4 100644
--- a/tests/TimeoutConnectorTest.php
+++ b/tests/TimeoutConnectorTest.php
@@ -199,7 +199,9 @@ public function testRejectionDuringConnectionShouldNotCreateAnyGarbageReferences
             $this->markTestSkipped('Not supported on legacy Promise v1 API');
         }
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $connection = new Deferred();
         $connector = $this->getMockBuilder('React\Socket\ConnectorInterface')->getMock();
@@ -223,7 +225,9 @@ public function testRejectionDueToTimeoutShouldNotCreateAnyGarbageReferences()
             $this->markTestSkipped('Not supported on legacy Promise v1 API');
         }
 
-        gc_collect_cycles();
+        while (gc_collect_cycles()) {
+            // collect all garbage cycles
+        }
 
         $connection = new Deferred(function () {
             throw new \RuntimeException('Connection cancelled');

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