diff --git a/requirements.txt b/requirements.txt
index 0a0fa6b..e78423c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,6 +6,6 @@ oyaml==1.0
 pypandoc==1.5
 python-frontmatter==1.0.0
 python-magic==0.4.24
-PyYAML==5.4.1
+PyYAML==5.3.1
 regex==2021.11.10
 soupsieve==2.2.1