diff --git a/ICO/requirements.txt b/ICO/requirements.txt
old mode 100755
new mode 100644
index ddbc7e9..29fbe26
--- a/ICO/requirements.txt
+++ b/ICO/requirements.txt
@@ -22,7 +22,7 @@ pyethash==0.1.27
 pylru==1.0.9
 pysha3==1.0.2
 pytest==3.0.7
-PyYAML==3.12
+PyYAML==5.4
 repoze.lru==0.6
 requests==2.13.0
 ruamel.yaml==0.14.5