diff --git a/setup.py b/setup.py
index 0980f40..0e86b37 100644
--- a/setup.py
+++ b/setup.py
@@ -25,7 +25,7 @@
         "httpx",
     ],
     "docs": ["mkdocs", "mkdocs-material", "pdocs"],
-    "server": ["uvicorn[standard]==0.19.0"],
+    "server": ["uvicorn[standard]==0.19.0", "typing_extensions==4.4.0"],
 }
 
 setup(