diff --git a/definition-files/ubuntu/Singularity.ubuntu-18.04 b/definition-files/ubuntu/Singularity.ubuntu-18.04
index f06b74d718dcb7bc38e7564086fd334b2418b391..f883a69d83da190c5a00172a38c2d46caac351b7 100644
--- a/definition-files/ubuntu/Singularity.ubuntu-18.04
+++ b/definition-files/ubuntu/Singularity.ubuntu-18.04
@@ -8,10 +8,10 @@ OSVersion: bionic
     APPLICATION_VERSION 18.04
     APPLICATION_URL https://www.ubuntu.com
 
-    AUTHOR_NAME Marty Kandes
-    AUTHOR_EMAIL mkandes@sdsc.edu
+    AUTHOR_NAME Michael Blaschek
+    AUTHOR_EMAIL michael.blaschek@univie.ac.at
 
-    LAST_UPDATED 20210112
+    LAST_UPDATED 20211118
 
 %setup
 
diff --git a/definition-files/ubuntu/Singularity.ubuntu-20.04 b/definition-files/ubuntu/Singularity.ubuntu-20.04
index a715e3385eb9582aedf63cc37f15f6cc6b97727c..26ff889f3d1a40afd985e5fd2883f4a2194349ad 100644
--- a/definition-files/ubuntu/Singularity.ubuntu-20.04
+++ b/definition-files/ubuntu/Singularity.ubuntu-20.04
@@ -8,10 +8,10 @@ OSVersion: focal
     APPLICATION_VERSION 20.04
     APPLICATION_URL https://www.ubuntu.com
 
-    AUTHOR_NAME Marty Kandes
-    AUTHOR_EMAIL mkandes@sdsc.edu
+    AUTHOR_NAME Michael Blaschek
+    AUTHOR_EMAIL michael.blaschek@univie.ac.at
 
-    LAST_UPDATED 20210223
+    LAST_UPDATED 20211118
 
 %setup