diff --git a/requirements.txt b/requirements.txt
index db38a1c0c..6846eac8a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,5 +8,5 @@ setuptools
 pyserial>=3.0
 future>=0.15.2
 cryptography>=2.1.4
-pyparsing>=2.0.3
+pyparsing>=2.0.3,<2.4.0
 pyelftools>=0.22