diff --git a/requirements.txt b/requirements.txt
index e67fce24..f3dd6824 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,6 +23,7 @@ py-evm
 py-solc-x
 py-solc
 pytest>=3.6.0
+pyparsing<3,>=2.0.2
 pytest-cov
 pytest_mock
 requests
diff --git a/setup.py b/setup.py
index 9b53e10a..1f1fb200 100755
--- a/setup.py
+++ b/setup.py
@@ -44,6 +44,7 @@ REQUIRED = [
     "eth-typing<3.0.0,>=2.1.0",
     "eth-utils==1.9.0",
     "coverage",
+    "pyparsing<3,>=2.0.2",
     "jinja2>=2.9",
     "rlp>=1.0.1,<2.0.0",
     "transaction>=2.2.1",