diff --git a/src/main/python/requirements.txt b/src/main/python/requirements.txt
index c8e97ee..dce43d6 100644
--- a/src/main/python/requirements.txt
+++ b/src/main/python/requirements.txt
@@ -2,3 +2,4 @@ beautifulsoup4==4.10.0
 pymupdf
 requests==2.21.0
 summa==1.2.0
+idna>=3.7 # not directly required, pinned by Snyk to avoid a vulnerability