diff --git a/mephisto/abstractions/architects/heroku_architect.py b/mephisto/abstractions/architects/heroku_architect.py
index 4eef7d571..120ddb0c9 100644
--- a/mephisto/abstractions/architects/heroku_architect.py
+++ b/mephisto/abstractions/architects/heroku_architect.py
@@ -347,7 +347,7 @@ def __setup_heroku_server(self) -> str:
         server_dir = self.__get_build_directory()
 
         print("Heroku: Starting server...")
-        branch = 'main'
+        branch = "main"
         heroku_server_directory_path = os.path.join(server_dir, "router")
         sh.git(shlex.split(f"-C {heroku_server_directory_path} init -b {branch}"))
 
@@ -419,7 +419,9 @@ def __setup_heroku_server(self) -> str:
         # commit and push to the heroku server
         sh.git(shlex.split(f"-C {heroku_server_directory_path} add -A"))
         sh.git(shlex.split(f'-C {heroku_server_directory_path} commit -m "app"'))
-        sh.git(shlex.split(f"-C {heroku_server_directory_path} push -f heroku {branch}"))
+        sh.git(
+            shlex.split(f"-C {heroku_server_directory_path} push -f heroku {branch}")
+        )
 
         os.chdir(heroku_server_directory_path)
         subprocess.check_output(