diff --git a/requirements.txt b/requirements.txt
index a3b31f5b..bd8d63f3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 pycryptodome==3.9.4
 requests==2.21.0
-PyYAML==5.1
+PyYAML==5.3.1
 scapy==2.4.3
 gym==0.14.0
 scipy==1.3.1