diff --git a/app/services/git/providers/abstract.rb b/app/services/git/providers/abstract.rb
index e3bdd555ac..294b336cf5 100644
--- a/app/services/git/providers/abstract.rb
+++ b/app/services/git/providers/abstract.rb
@@ -29,8 +29,8 @@ def destroy_file(path)
     raise NoMethodError, "You must implement the `destroy_file` method in #{self.class.name}"
   end
 
-  def update_theme
-    raise NoMethodError, "You must implement the `update_theme` method in #{self.class.name}"
+  def update_theme!
+    raise NoMethodError, "You must implement the `update_theme!` method in #{self.class.name}"
   end
 
   def push(commit_message)
@@ -58,4 +58,21 @@ def files_in_the_repository
   def batch
     @batch ||= []
   end
+
+  def current_theme_sha
+    @current_theme_sha ||= Osuny::ThemeInfo.get_current_sha
+  end
+
+  def previous_theme_sha
+    @previous_theme_sha ||= git_sha(ENV["GITHUB_WEBSITE_THEME_PATH"])
+  end
+
+  def should_update_theme?
+    previous_theme_sha != current_theme_sha
+  end
+
+  def theme_update_commit_message
+    theme_name = ENV["GITHUB_WEBSITE_THEME_REPOSITORY"].to_s.split("/").last
+    "Updated #{theme_name} version"
+  end
 end
diff --git a/app/services/git/providers/github.rb b/app/services/git/providers/github.rb
index 3c0346617f..edf5572297 100644
--- a/app/services/git/providers/github.rb
+++ b/app/services/git/providers/github.rb
@@ -3,7 +3,6 @@ class Git::Providers::Github < Git::Providers::Abstract
   COMMIT_BATCH_SIZE = 30
 
   include WithSecrets
-  include WithTheme
 
   def url
     "#{BASE_URL}/#{repository}"
@@ -56,6 +55,17 @@ def destroy_file(path)
     }
   end
 
+  def update_theme!
+    return unless should_update_theme?
+    batch << {
+      path: ENV["GITHUB_WEBSITE_THEME_PATH"],
+      mode: '160000',
+      type: 'commit',
+      sha: current_theme_sha
+    }
+    push(theme_update_commit_message)
+  end
+
   def init_from_template(name)
     client.create_repository_from_template(
       ENV['GITHUB_WEBSITE_TEMPLATE_REPOSITORY'],
diff --git a/app/services/git/providers/github/with_theme.rb b/app/services/git/providers/github/with_theme.rb
deleted file mode 100644
index db55f279da..0000000000
--- a/app/services/git/providers/github/with_theme.rb
+++ /dev/null
@@ -1,22 +0,0 @@
-module Git::Providers::Github::WithTheme
-  extend ActiveSupport::Concern
-
-  def update_theme
-    batch << {
-      path: ENV["GITHUB_WEBSITE_THEME_PATH"],
-      mode: '160000',
-      type: 'commit',
-      sha: current_theme_sha
-    } if previous_theme_sha != current_theme_sha
-  end
-
-  protected
-
-  def current_theme_sha
-    @current_theme_sha ||= Osuny::ThemeInfo.get_current_sha
-  end
-
-  def previous_theme_sha
-    @previous_theme_sha ||= git_sha(ENV["GITHUB_WEBSITE_THEME_PATH"])
-  end
-end
\ No newline at end of file
diff --git a/app/services/git/providers/gitlab.rb b/app/services/git/providers/gitlab.rb
index 7cf2c5c0c9..67144b8f15 100644
--- a/app/services/git/providers/gitlab.rb
+++ b/app/services/git/providers/gitlab.rb
@@ -40,8 +40,15 @@ def destroy_file(path)
     }
   end
 
-  def update_theme
-    raise NoMethodError, "You must implement the `update_theme` method in #{self.class.name}"
+  def update_theme!
+    return unless should_update_theme?
+    client.edit_submodule repository,
+                          ENV["GITHUB_WEBSITE_THEME_PATH"],
+                          {
+                            branch: branch,
+                            commit_sha: current_theme_sha,
+                            commit_message: theme_update_commit_message
+                          }
   end
 
   def init_from_template(name)
diff --git a/app/services/git/repository.rb b/app/services/git/repository.rb
index c458892e8f..29073b4186 100644
--- a/app/services/git/repository.rb
+++ b/app/services/git/repository.rb
@@ -24,9 +24,7 @@ def sync!
   end
 
   def update_theme_version!
-    provider.update_theme
-    theme_name = ENV["GITHUB_WEBSITE_THEME_REPOSITORY"].to_s.split("/").last
-    provider.push("Updated #{theme_name} version")
+    provider.update_theme!
   end
 
   # Based on content, with the provider's algorithm (sha1 or sha256)