diff --git a/requirements.txt b/requirements.txt
index ac74a57..f280622 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ pycparser==2.19
 pycryptodome==3.7.3
 pyethash==0.1.27
 pysha3==1.0.2
-PyYAML==3.13
+PyYAML==5.4
 repoze.lru==0.7
 requests==2.21.0
 rlp==1.1.0