diff --git a/requirements.txt b/requirements.txt
index e0e9d0eb..4c6efd1d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,4 @@ capstone>=4.0.1
 unicorn>=1.0.2rc3
 pefile>=2019.4.18
 python-registry>=1.3.1
-#keystone-engine>=0.9.1.post3
+keystone-engine>=0.9.1.post3