diff --git a/src/AddressList.php b/src/AddressList.php
index 0094bca0..fc4826ad 100644
--- a/src/AddressList.php
+++ b/src/AddressList.php
@@ -86,7 +86,7 @@ public function addMany(array $addresses)
             if (! is_string($key)) {
                 throw new Exception\RuntimeException(sprintf(
                     'Invalid key type in provided addresses array ("%s")',
-                    is_object($key) ? get_class($key) : var_export($key, 1)
+                    is_object($key) ? get_class($key) : var_export($key, true)
                 ));
             }
 
diff --git a/src/Header/ContentDisposition.php b/src/Header/ContentDisposition.php
index e03afb46..09fbbec9 100644
--- a/src/Header/ContentDisposition.php
+++ b/src/Header/ContentDisposition.php
@@ -82,7 +82,7 @@ public static function fromString($headerLine)
 
                     if (! is_numeric($count)) {
                         $type  = gettype($count);
-                        $value = var_export($count, 1);
+                        $value = var_export($count, true);
                         throw new Exception\InvalidArgumentException(sprintf(
                             "Invalid header line for Content-Disposition string"
                             . " - count expected to be numeric, got %s with value %s",
diff --git a/src/Protocol/Smtp.php b/src/Protocol/Smtp.php
index dbc98182..78f2a937 100644
--- a/src/Protocol/Smtp.php
+++ b/src/Protocol/Smtp.php
@@ -4,7 +4,6 @@
 
 namespace Laminas\Mail\Protocol;
 
-use Exception;
 use Generator;
 use Laminas\Mail\Headers;
 
@@ -321,7 +320,7 @@ public function hasSession()
      * Send EHLO or HELO depending on capabilities of smtp host
      *
      * @param  string $host The client hostname or IP address (default: 127.0.0.1)
-     * @throws Exception|Exception\ExceptionInterface
+     * @throws Exception\ExceptionInterface
      */
     protected function ehlo($host)
     {
diff --git a/test/Storage/MessageTest.php b/test/Storage/MessageTest.php
index 2c371822..0b51ab33 100644
--- a/test/Storage/MessageTest.php
+++ b/test/Storage/MessageTest.php
@@ -396,8 +396,8 @@ public function testMessageFlagsAreSet(): void
         $message   = new Message(['flags' => $origFlags]);
 
         $messageFlags = $message->getFlags();
-        $this->assertTrue($message->hasFlag('bar'), var_export($messageFlags, 1));
-        $this->assertTrue($message->hasFlag('bat'), var_export($messageFlags, 1));
+        $this->assertTrue($message->hasFlag('bar'), var_export($messageFlags, true));
+        $this->assertTrue($message->hasFlag('bat'), var_export($messageFlags, true));
         $this->assertEquals(['bar' => 'bar', 'bat' => 'bat'], $messageFlags);
     }