diff --git a/AppImageBuilder.yml b/AppImageBuilder.yml
index 084c2e8..ffd4159 100644
--- a/AppImageBuilder.yml
+++ b/AppImageBuilder.yml
@@ -32,7 +32,7 @@ AppDir:
     arch: amd64
     allow_unauthenticated: true
     sources:
-      - sourceline: 'deb [arch=amd64] http://mirror.infra.pkm/ bullseye main contrib non-free'
+      - sourceline: 'deb [arch=amd64] http://ftp.uni-mainz.de/debian bullseye main contrib non-free'
 
     include:
       # for /usr/bin/env
@@ -42,7 +42,7 @@ AppDir:
 #      - hicolor-icon-theme
       - libatlas3-base
       - gnuplot-nox
-      - python3.9-minimal
+      - python3-minimal
       - python3-numpy
       - python3-scipy
       - python3-bsddb3