diff --git a/defaults/main.yml b/defaults/main.yml
index ae33ddd..b6b322e 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -19,5 +19,8 @@ print_os_vars: false
 # do we want non-free firmware from eth zuerich?
 base_pkg_non_free_firmware: false
 
+# do we want contrib from eth zuerich?
+base_pkg_contrib: false
+
 # version management
 submodules_versioncheck: true
diff --git a/tasks/sources.yml b/tasks/sources.yml
index 3f6b4fa..e80d049 100644
--- a/tasks/sources.yml
+++ b/tasks/sources.yml
@@ -20,6 +20,7 @@
     state: present
   when:
     - not base_pkg_non_free_firmware | bool
+    - not base_pkg_contrib | bool
     - add_ethz | bool
     - ansible_distribution == 'Debian'
     - ansible_machine != 'armv6l' and ansible_distribution_release != 'wheezy'
@@ -31,6 +32,7 @@
     state: absent
   when:
     - not base_pkg_non_free_firmware | bool
+    - not base_pkg_contrib | bool
     - not add_ethz | bool
     - ansible_distribution == 'Debian'
     - ansible_machine != 'armv6l' and ansible_distribution_release != 'wheezy'
@@ -42,6 +44,7 @@
     state: present
   when:
     - base_pkg_non_free_firmware | bool
+    - not base_pkg_contrib | bool
     - add_ethz | bool
     - ansible_distribution == 'Debian'
     - ansible_machine != 'armv6l' and ansible_distribution_release != 'wheezy'
@@ -53,6 +56,31 @@
     state: absent
   when:
     - base_pkg_non_free_firmware | bool
+    - not base_pkg_contrib | bool
+    - not add_ethz | bool
+    - ansible_distribution == 'Debian'
+    - ansible_machine != 'armv6l' and ansible_distribution_release != 'wheezy'
+
+- name: add eth zurich apt + contrib + non-free
+  become: true
+  apt_repository:
+    repo: deb-src https://debian.ethz.ch/debian/ {{ ansible_distribution_release }} main contrib non-free
+    state: present
+  when:
+    - base_pkg_non_free_firmware | bool
+    - base_pkg_contrib | bool
+    - add_ethz | bool
+    - ansible_distribution == 'Debian'
+    - ansible_machine != 'armv6l' and ansible_distribution_release != 'wheezy'
+
+- name: remove eth zurich apt + contrib + non-free
+  become: true
+  apt_repository:
+    repo: deb-src https://debian.ethz.ch/debian/ {{ ansible_distribution_release }} main contrib non-free
+    state: absent
+  when:
+    - base_pkg_non_free_firmware | bool
+    - base_pkg_contrib | bool
     - not add_ethz | bool
     - ansible_distribution == 'Debian'
     - ansible_machine != 'armv6l' and ansible_distribution_release != 'wheezy'
diff --git a/vars/main.yml b/vars/main.yml
index 5a15a42..f902eed 100644
--- a/vars/main.yml
+++ b/vars/main.yml
@@ -50,5 +50,5 @@ fedora_packages:
   - python3-pip 
   - python3
 
-playbook_version_number: 8970 # should be over ninethousand
+playbook_version_number: 8971 # should be over ninethousand
 playbook_version_path: '/etc/ansible-version/base-packages_ffbsee_or_chaos-bodensee_github.version'