diff --git a/src/Gravatar.php b/src/Gravatar.php
index ff86bcc..82a37f2 100644
--- a/src/Gravatar.php
+++ b/src/Gravatar.php
@@ -16,7 +16,7 @@ class Gravatar extends Base
         'wavatar',
     ];
 
-    private const URL = 'https://www.gravatar.com/avatar/%s.jpg?d=%s&size=%d';
+    private const URL = 'https://www.gravatar.com/avatar/%s?d=%s&size=%d';
 
     public static function gravatarUrl(string $mode = null, string $email = null, int $size = 80): string
     {
diff --git a/tests/GravatarTest.php b/tests/GravatarTest.php
index 4a95b5b..f9b18c0 100644
--- a/tests/GravatarTest.php
+++ b/tests/GravatarTest.php
@@ -9,17 +9,17 @@ class GravatarTest extends TestCase
 {
     public function testDefaultUrlValues()
     {
-        $this->assertRegExp('#^https://www\.gravatar\.com/avatar/\d+\.jpg\?d=retro&size=80#', Gravatar::gravatarUrl());
+        $this->assertRegExp('#^https://www\.gravatar\.com/avatar/\d+\?d=retro&size=80#', Gravatar::gravatarUrl());
     }
 
     public function testGravatarUrlAcceptsCustomMode()
     {
-        $this->assertRegExp('#^https://www\.gravatar\.com/avatar/\d+\.jpg\?d=mp&size=80#', Gravatar::gravatarUrl('mp'));
+        $this->assertRegExp('#^https://www\.gravatar\.com/avatar/\d+\?d=mp&size=80#', Gravatar::gravatarUrl('mp'));
     }
 
     public function testGravatarUrlAcceptsCustomSize()
     {
-        $this->assertRegExp('#^https://www\.gravatar\.com/avatar/\d+\.jpg\?d=retro&size=200#', Gravatar::gravatarUrl(null, null, 200));
+        $this->assertRegExp('#^https://www\.gravatar\.com/avatar/\d+\?d=retro&size=200#', Gravatar::gravatarUrl(null, null, 200));
     }
 
     public function testGravatarUrlAcceptsCustomEmail()
@@ -27,7 +27,7 @@ public function testGravatarUrlAcceptsCustomEmail()
         $email = 'TeSt@EmAiL.OK';
         $hash = md5(strtolower($email));
 
-        $this->assertRegExp("#^https://www\.gravatar\.com/avatar/${hash}\.jpg\?d=retro&size=80#", Gravatar::gravatarUrl(null, $email));
+        $this->assertRegExp("#^https://www\.gravatar\.com/avatar/${hash}\?d=retro&size=80#", Gravatar::gravatarUrl(null, $email));
     }
 
     public function testDownloadWithDefaults()