diff --git a/requirements-dev.txt b/requirements-dev.txt
index 08510ee..c0f99cc 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,7 +4,6 @@ tox>=1.8.0
 eth-testrpc>=1.1.0
 ethereum>=1.5.2
 secp256k1>=0.13.1
-rlp>=0.4.6,<0.4.7
 hypothesis>=3.4.2
 flaky>=3.3.0
 flake8==3.0.4