diff --git a/setup.py b/setup.py
index b403405122..933e8bfa4b 100644
--- a/setup.py
+++ b/setup.py
@@ -21,6 +21,7 @@
         "hypothesis[lark]>=6.0,<7.0",
         "eth-stdlib==0.2.7",
         "setuptools",
+        "hexbytes<1.0",
         "typing_extensions",  # we can remove this once dependencies upgrade to eth-rlp>=2.0
     ],
     "lint": [