diff --git a/requirements.txt b/requirements.txt
index 13e88c78..aad67f69 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ configparser>=3.5.0
 coverage
 eth_abi>=1.0.0
 eth-account>=0.1.0a2
-ethereum>=2.3.0
+ethereum==2.3.1
 eth-hash>=0.1.0
 eth-keyfile>=0.5.1
 eth-keys>=0.2.0b3
diff --git a/setup.py b/setup.py
index 3cbf5f97..0e7c624d 100755
--- a/setup.py
+++ b/setup.py
@@ -305,7 +305,7 @@ setup(
     packages=find_packages(exclude=['contrib', 'docs', 'tests']),
 
     install_requires=[
-        'ethereum>=2.3.0',
+        'ethereum==2.3.1',
         'z3-solver>=4.5',
         'requests',
         'py-solc',