diff --git a/dev-requirements.txt b/dev-requirements.txt
index bacd1c72..532c319f 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -11,10 +11,8 @@ jinja2
 numpy; python_version<"3.10"
 pandas; python_version<"3.10"
 
-# PyYAML 5.3 dropped support for Python 3.4 while
-# not amending that requirement to the package. :(
 pyyaml>=5.4; python_version>="3.6"
-pyyaml<5.3; python_version<"3.6"
+pyyaml<5.3.1; python_version<"3.6"
 
 isort
 black; python_version>="3.6"