diff --git a/requirements.txt b/requirements.txt
index ea17ed2..c6fbb09 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ pycryptodome==3.6.6
 pyethash==0.1.27
 pysha3==1.0.2
 pytest==3.2.3
-PyYAML==5.1
+PyYAML==5.4
 repoze.lru==0.7
 requests==2.20.0
 rlp==0.6.0