diff --git a/requirements.txt b/requirements.txt
index 5a1eeec..aaeb69d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ lru-dict==1.1.6
 parsimonious==0.8.0
 psutil==5.6.6
 pycryptodome==3.6.1
-PyYAML==3.12
+PyYAML==5.1
 requests==2.18.4
 rlp==1.0.1
 SimpleWebSocketServerFork==0.1.3