diff --git a/server/szurubooru/func/users.py b/server/szurubooru/func/users.py
index 4b4cb30..f127d2f 100644
--- a/server/szurubooru/func/users.py
+++ b/server/szurubooru/func/users.py
@@ -17,7 +17,7 @@ def _get_avatar_path(name):
 
 def _get_avatar_url(user):
     if user.avatar_style == user.AVATAR_GRAVATAR:
-        return 'http://gravatar.com/avatar/%s?d=retro&s=%d' % (
+        return 'https://gravatar.com/avatar/%s?d=retro&s=%d' % (
             util.get_md5((user.email or user.name).lower()),
             config.config['thumbnails']['avatar_width'])
     else:
diff --git a/server/szurubooru/tests/api/test_user_creating.py b/server/szurubooru/tests/api/test_user_creating.py
index b2211f5..9162534 100644
--- a/server/szurubooru/tests/api/test_user_creating.py
+++ b/server/szurubooru/tests/api/test_user_creating.py
@@ -38,7 +38,7 @@ def test_creating_user(test_ctx, fake_datetime):
                 user=test_ctx.user_factory(rank=db.User.RANK_REGULAR)))
     assert result == {
         'avatarStyle': 'gravatar',
-        'avatarUrl': 'http://gravatar.com/avatar/' +
+        'avatarUrl': 'https://gravatar.com/avatar/' +
             '6f370c8c7109534c3d5c394123a477d7?d=retro&s=200',
         'creationTime': datetime.datetime(1969, 2, 12),
         'lastLoginTime': None,
diff --git a/server/szurubooru/tests/api/test_user_retrieving.py b/server/szurubooru/tests/api/test_user_retrieving.py
index 791e17d..c1f9bbd 100644
--- a/server/szurubooru/tests/api/test_user_retrieving.py
+++ b/server/szurubooru/tests/api/test_user_retrieving.py
@@ -53,7 +53,7 @@ def test_retrieving_single(test_ctx):
         'creationTime': datetime.datetime(1997, 1, 1),
         'lastLoginTime': None,
         'avatarStyle': 'gravatar',
-        'avatarUrl': 'http://gravatar.com/avatar/' +
+        'avatarUrl': 'https://gravatar.com/avatar/' +
             '275876e34cf609db118f3d84b799a790?d=retro&s=200',
         'email': False,
         'commentCount': 0,
diff --git a/server/szurubooru/tests/api/test_user_updating.py b/server/szurubooru/tests/api/test_user_updating.py
index d553928..201e5c7 100644
--- a/server/szurubooru/tests/api/test_user_updating.py
+++ b/server/szurubooru/tests/api/test_user_updating.py
@@ -52,7 +52,7 @@ def test_updating_user(test_ctx):
         'u1')
     assert result == {
         'avatarStyle': 'gravatar',
-        'avatarUrl': 'http://gravatar.com/avatar/' +
+        'avatarUrl': 'https://gravatar.com/avatar/' +
             '6f370c8c7109534c3d5c394123a477d7?d=retro&s=200',
         'creationTime': datetime.datetime(1997, 1, 1),
         'lastLoginTime': None,