diff --git a/.gitignore b/.gitignore
index b1a46f1e..a3223416 100644
--- a/.gitignore
+++ b/.gitignore
@@ -130,6 +130,7 @@ docker/alpine/Dockerfile
 docker/alpine-no-gettext/Dockerfile
 docker/debian9/Dockerfile
 docker/debian10/Dockerfile
+docker/debian11/Dockerfile
 docker/debian-stable/Dockerfile
 docker/debian-testing/Dockerfile
 
diff --git a/docker/debian9/Dockerfile.in b/docker/debian11/Dockerfile.in
similarity index 96%
rename from docker/debian9/Dockerfile.in
rename to docker/debian11/Dockerfile.in
index f6af94d6..b6177845 100644
--- a/docker/debian9/Dockerfile.in
+++ b/docker/debian11/Dockerfile.in
@@ -1,4 +1,4 @@
-FROM debian:9
+FROM debian:11
 LABEL org.opencontainers.image.authors="enrico.m.crisostomo@gmail.com>"
 
 RUN apt-get -y update && apt-get install -y git autoconf automake gettext autopoint libtool make g++ texinfo curl