diff --git a/requirements.txt b/requirements.txt
index 7516d19..5c215ab 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,4 +9,5 @@ rstcheck
 docutils
 esbonio
 pytz
-certifi-linux
\ No newline at end of file
+certifi-linux
+ruamel.yaml
\ No newline at end of file