diff --git a/requirements.txt b/requirements.txt
index 6a9793304..e04e05c1e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,4 +10,4 @@ pyserial>=3.0
 future>=0.15.2
 cryptography>=2.1.4,<35
 pyparsing>=2.0.3,<2.4.0
-pyelftools>=0.22
+pyelftools>=0.22,<0.28