diff --git a/docker-images/base-devel/Dockerfile b/docker-images/base-devel/Dockerfile
index 218300b..2c89636 100644
--- a/docker-images/base-devel/Dockerfile
+++ b/docker-images/base-devel/Dockerfile
@@ -14,7 +14,7 @@ RUN \
   cd /tmp/unison-2.53.3 && \
   make
 
-FROM unison
+FROM debian:bookworm-slim
 
 RUN \
   set -x && \
diff --git a/docker-images/base/Dockerfile b/docker-images/base/Dockerfile
index da78d8d..92afe8a 100644
--- a/docker-images/base/Dockerfile
+++ b/docker-images/base/Dockerfile
@@ -14,7 +14,7 @@ RUN \
   cd /tmp/unison-2.53.3 && \
   make
 
-FROM unison
+FROM debian:bullseye-slim
 
 RUN \
   set -x && \