diff --git a/setup.py b/setup.py
index e58fd8ce..a28e0e03 100644
--- a/setup.py
+++ b/setup.py
@@ -57,7 +57,7 @@ setup(
         "h11==0.8.*",
         "h2==3.*",
         "idna==2.*",
-        "rfc3986==1.*",
+        "rfc3986>=1.3,<2",
         "sniffio==1.*",
     ],
     classifiers=[