diff --git a/requirements.txt b/requirements.txt
index 95b6e515..8a6287d3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,4 +13,5 @@ openpyxl~=3.0.7
 networkx~=2.5.1
 parseidf~=1.0.0
 ply~=3.11
-scipy==1.7.1
\ No newline at end of file
+scipy==1.7.1
+PyYAML==6.0
\ No newline at end of file