diff --git a/requirements-dev.txt b/requirements-dev.txt
index db81a8d..e84cbf4 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,3 +1,4 @@
+pyyaml
 setuptools >= 44.1.1  # Old setuptools causes script.module.addon.signals to fail installing
 six >= 1.13
 python-dateutil >= 2.8.1