bump yaml version
diff --git a/requirements.txt b/requirements.txt
index 643de4a..3f52401 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 # Items in this file must have a licence compatible with AL 2.0
-PyYAML~=5.3.1                     # WTFPL
+PyYAML~=5.4.1                     # WTFPL
 elasticsearch-dsl>=7.0.0,<8.0.0   # AL2.0
 elasticsearch[async]~=7.13.1      # AL2.0
 certifi~=2020.6.20                # MPL 2.0