diff --git a/launch.py b/launch.py
index 034de0a9..de8bde24 100644
--- a/launch.py
+++ b/launch.py
@@ -237,7 +237,8 @@ def run_extensions_installers(settings_file):
 
 
 def prepare_environment():
-    torch_command = os.environ.get('TORCH_COMMAND', "pip install torch==2.0.1+cu118 torchvision==0.15.2+cu118 --extra-index-url https://download.pytorch.org/whl/cu118")
+    torch_index_url = os.environ.get('TORCH_INDEX_URL', "https://download.pytorch.org/whl/cu118")
+    torch_command = os.environ.get('TORCH_COMMAND', f"pip install torch==2.0.1 torchvision==0.15.2 --extra-index-url {torch_index_url}")
     requirements_file = os.environ.get('REQS_FILE', "requirements_versions.txt")
 
     xformers_package = os.environ.get('XFORMERS_PACKAGE', 'xformers==0.0.17')
@@ -292,7 +293,7 @@ def prepare_environment():
                 if not is_installed("xformers"):
                     exit(0)
         elif platform.system() == "Linux":
-            run_pip(f"install {xformers_package}", "xformers")
+            run_pip(f"install -U -I --no-deps {xformers_package}", "xformers")
 
     if not is_installed("pyngrok") and args.ngrok:
         run_pip("install pyngrok", "ngrok")