diff --git a/requirements.txt b/requirements.txt
index 81720e06..b4f2f220 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -42,7 +42,7 @@ pyethash==0.1.27
 pylru==1.0.9
 pysha3==1.0.2
 pytest==3.2.0
-PyYAML==3.12
+PyYAML==5.4
 repoze.lru==0.6
 requests==2.20.1
 rlp==1.0.3