diff --git a/requirements.txt b/requirements.txt
index b3d2ebd..b007519 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 logzero>=1.5.0
 requests>=2.21
-pyyaml>=5.3.1
+pyyaml~=5.3; python_version < '3.6'
+pyyaml~=5.4; python_version >= '3.6'
 importlib-metadata>=1.2.0; python_version < '3.8'