diff --git a/README.md b/README.md
index 93dfcf6..c83c5d6 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ by means of declaring `kerberos: true`, more information
 If you want to try it locally, a Kerberos token can be obtained via:
 
 ```
-$ docker run -i -t --rm docker.io/reanahub/reana-auth-krb5:1.0.2 /bin/bash
+$ docker run -i -t --rm docker.io/reanahub/reana-auth-krb5:1.0.3 /bin/bash
 > kinit -k -t /path/to/keytab_file username@CERN.CH
 > klist
 ```
@@ -40,6 +40,10 @@ container requires additional information and inputs:
 
 ## Changes
 
+Version 1.0.3 (2024-04-17)
+
+- Upgrade Dockerfile's base image to `ubuntu:20.04`, the same that is used in all other REANA components.
+
 Version 1.0.2 (2024-04-17)
 
 - Add new dependency `inotify-tools` that provides the `inotifywait` utility that is used by REANA 0.95 to quickly stop the Kerberos sidecar containers when the user jobs finish their execution.