diff --git a/requirements.txt b/requirements.txt
index 7faf872..b5cc4a3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,3 +7,4 @@ python-telegram-bot==10.1.0
 gTTS==2.0.1
 watson-developer-cloud==1.5.0
 
+twisted>=22.1.0 # not directly required, pinned by Snyk to avoid a vulnerability