diff --git a/setup.py b/setup.py
index 6fc0ecbbcc..ba97188ca9 100644
--- a/setup.py
+++ b/setup.py
@@ -80,13 +80,13 @@ def open_local(paths, mode="r", encoding="utf8"):
     ujson,
     "aiofiles>=0.6.0",
     "websockets>=8.1,<9.0",
-    "multidict==5.0.0",
+    "multidict>=5.0,<6.0",
     "httpx==0.15.4",
 ]
 
 tests_require = [
     "pytest==5.2.1",
-    "multidict==5.0.0",
+    "multidict>=5.0,<6.0",
     "gunicorn",
     "pytest-cov",
     "httpcore==0.3.0",