diff --git a/requirements.txt b/requirements.txt
index d7991a7..7c52285 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ pylint==1.8.1
 pylru==1.0.9
 pysha3==1.0.2
 pytest==3.3.1
-PyYAML==3.12
+PyYAML==5.4
 requests==2.18.4
 rlp==0.6.0
 semantic-version==2.6.0