diff --git a/update_unstable.py b/update_unstable.py
index 5058b47..5cbff06 100755
--- a/update_unstable.py
+++ b/update_unstable.py
@@ -6,7 +6,7 @@ import argparse
 import logging
 import json
 from pathlib import Path
-from urllib.parse import urlencode
+from urllib.parse import quote
 
 import git
 import requests
@@ -50,7 +50,8 @@ class GitHashCache:
 
 
 def project_exists(project):
-    project_name = urlencode(project)
+    # We want / to get quoted, so put safe to ""
+    project_name = quote(project, safe="")
     request = requests.get(API_URL + project_name)
 
     if request: