diff --git a/Dockerfile.debian b/Dockerfile.debian
index 1ec2451f87f6dd849543d4a5eaf14c743d0f9d7e..507174ac6f45eacba69a43b389a7a5b9923885d0 100644
--- a/Dockerfile.debian
+++ b/Dockerfile.debian
@@ -11,6 +11,7 @@ RUN apt-get update && apt-get install -y \
   jq \
   openssh-client \
   unzip \
+  idn2 \
   && rm -rf /var/lib/apt/lists/*
 
 # NOTE: cosign is not yet available in the debian apt sources