diff --git a/requirements.txt b/requirements.txt
index 87132a4..5227ca6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 Fabric==1.10.0
-PyYAML==3.11
+PyYAML==5.4
 cov-core==1.15.0
 coverage==3.7.1
 ecdsa==0.11