diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
new file mode 100644
index 00000000..a61b54b2
--- /dev/null
+++ b/phpstan-baseline.neon
@@ -0,0 +1,43 @@
+parameters:
+	ignoreErrors:
+		-
+			message: '#^Instanceof between ArrayAccess and ArrayAccess will always evaluate to true\.$#'
+			identifier: instanceof.alwaysTrue
+			count: 1
+			path: src/AbstractTransport.php
+
+		-
+			message: '#^Result of && is always false\.$#'
+			identifier: booleanAnd.alwaysFalse
+			count: 1
+			path: src/AbstractTransport.php
+
+		-
+			message: '#^Instanceof between ArrayAccess and ArrayAccess will always evaluate to true\.$#'
+			identifier: instanceof.alwaysTrue
+			count: 1
+			path: src/Http.php
+
+		-
+			message: '#^Instanceof between Joomla\\Uri\\UriInterface and Joomla\\Uri\\UriInterface will always evaluate to true\.$#'
+			identifier: instanceof.alwaysTrue
+			count: 1
+			path: src/Http.php
+
+		-
+			message: '#^Result of && is always false\.$#'
+			identifier: booleanAnd.alwaysFalse
+			count: 1
+			path: src/Http.php
+
+		-
+			message: '#^Instanceof between ArrayAccess and ArrayAccess will always evaluate to true\.$#'
+			identifier: instanceof.alwaysTrue
+			count: 2
+			path: src/HttpFactory.php
+
+		-
+			message: '#^Result of && is always false\.$#'
+			identifier: booleanAnd.alwaysFalse
+			count: 2
+			path: src/HttpFactory.php
diff --git a/phpstan.neon b/phpstan.neon
index 07d82270..2197bd8f 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,5 +1,6 @@
 
 includes:
+	- phpstan-baseline.neon
 	- vendor/phpstan/phpstan-deprecation-rules/rules.neon
 
 parameters:
diff --git a/src/Transport/Socket.php b/src/Transport/Socket.php
index 94d12432..9aedd4c8 100644
--- a/src/Transport/Socket.php
+++ b/src/Transport/Socket.php
@@ -286,6 +286,6 @@ protected function connect(UriInterface $uri, $timeout = null)
      */
     public static function isSupported()
     {
-        return \function_exists('fsockopen') && \is_callable('fsockopen');
+        return \function_exists('fsockopen');
     }
 }
diff --git a/src/Transport/Stream.php b/src/Transport/Stream.php
index 076abcd6..ef468ba0 100644
--- a/src/Transport/Stream.php
+++ b/src/Transport/Stream.php
@@ -258,6 +258,6 @@ protected function getResponse(array $headers, $body)
      */
     public static function isSupported()
     {
-        return \function_exists('fopen') && \is_callable('fopen') && ini_get('allow_url_fopen');
+        return \function_exists('fopen') && ini_get('allow_url_fopen');
     }
 }