diff --git a/README.md b/README.md
index 74cb9d2..2962ad7 100644
--- a/README.md
+++ b/README.md
@@ -21,8 +21,8 @@ Based on the offical [BusyBox glibc image](https://hub.docker.com/_/busybox)
 
 Based on the offical [Alpine image](https://hub.docker.com/_/alpine) and [Alpine GLIBC package](https://github.com/sgerrand/alpine-pkg-glibc)
 
-[![](https://images.microbadger.com/badges/version/xfournet/jready:alpine-3.12.3.svg)](https://microbadger.com/images/xfournet/jready:alpine-3.12.3)
-[![](https://images.microbadger.com/badges/image/xfournet/jready:alpine-3.12.3.svg)](https://microbadger.com/images/xfournet/jready:alpine-3.12.3)
+[![](https://images.microbadger.com/badges/version/xfournet/jready:alpine-3.13.0.svg)](https://microbadger.com/images/xfournet/jready:alpine-3.13.0)
+[![](https://images.microbadger.com/badges/image/xfournet/jready:alpine-3.13.0.svg)](https://microbadger.com/images/xfournet/jready:alpine-3.13.0)
 
 # Example
 
diff --git a/alpine/Dockerfile b/alpine/Dockerfile
index 7d364ac..f79fba5 100644
--- a/alpine/Dockerfile
+++ b/alpine/Dockerfile
@@ -1,8 +1,8 @@
-ARG alpine_image=alpine:3.12.3
+ARG alpine_image=alpine:3.13.0
 ARG alpine_glibc_version=2.32-r0
 
 # extract libz & libgcc_s from the same base image than the one used to build glibc (see https://github.com/sgerrand/docker-glibc-builder/blob/master/Dockerfile)
-ARG alpine_pkg_glibc_image=ubuntu:20.10
+ARG alpine_pkg_glibc_image=ubuntu:20.04
 
 
 # Extract libz from Ubuntu image