diff --git a/modules/restricted-guests/synapse/Dockerfile b/modules/restricted-guests/synapse/Dockerfile
index baaab8c2ca..80d9b87f12 100644
--- a/modules/restricted-guests/synapse/Dockerfile
+++ b/modules/restricted-guests/synapse/Dockerfile
@@ -1,4 +1,5 @@
-FROM debian:bookworm-slim
+ARG DEBIAN_VERSION_NUMERIC=12
+FROM gcr.io/distroless/base-nossl-debian${DEBIAN_VERSION_NUMERIC}
 
 WORKDIR /src
 COPY synapse_guest_module /src/synapse_guest_module