diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 0f122b22..4cb6a3e4 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -37,6 +37,7 @@ jobs:
       run: |
         sudo add-apt-repository ppa:alexlarsson/flatpak
         sudo add-apt-repository ppa:alexlarsson/glib260
+        sudo add-apt-repository 'deb https://download.mono-project.com/repo/ubuntu stable-bionic main' # Needed for updates to work
         sudo apt-get update
         sudo apt-get install -y libglib2.0 attr automake gettext autopoint bison  dbus gtk-doc-tools \
         libfuse-dev ostree libostree-dev libarchive-dev libzstd-dev libcap-dev libattr1-dev libdw-dev libelf-dev python3-pyparsing \
@@ -114,6 +115,7 @@ jobs:
       run: |
         sudo add-apt-repository ppa:alexlarsson/flatpak
         sudo add-apt-repository ppa:alexlarsson/glib260
+        sudo add-apt-repository 'deb https://download.mono-project.com/repo/ubuntu stable-bionic main' # Needed for updates to work
         sudo apt-get update
         sudo apt-get install -y libglib2.0 attr automake gettext autopoint bison  dbus gtk-doc-tools \
         libfuse-dev ostree libostree-dev libarchive-dev libzstd-dev libcap-dev libattr1-dev libdw-dev libelf-dev python3-pyparsing \
@@ -141,6 +143,7 @@ jobs:
     - name: Install Dependencies
       run: |
         sudo add-apt-repository ppa:alexlarsson/flatpak
+        sudo add-apt-repository 'deb https://download.mono-project.com/repo/ubuntu stable-xenial main' # Needed for updates to work
         sudo apt-get update
         sudo apt-get install -y libglib2.0 attr automake gettext autopoint bison  dbus gtk-doc-tools \
         libfuse-dev ostree libostree-dev libarchive-dev libzstd-dev libcap-dev libattr1-dev libdw-dev libelf-dev python3-pyparsing \
@@ -167,6 +170,7 @@ jobs:
     - name: Install Dependencies
       run: |
         sudo apt-get update
+        sudo add-apt-repository 'deb https://download.mono-project.com/repo/ubuntu stable-focal main' # Needed for updates to work
         sudo apt-get install -y libglib2.0 attr automake gettext autopoint bison  dbus gtk-doc-tools \
         libfuse-dev ostree libostree-dev libarchive-dev libzstd-dev libcap-dev libattr1-dev libdw-dev libelf-dev python3-pyparsing \
         libjson-glib-dev shared-mime-info desktop-file-utils libpolkit-agent-1-dev libpolkit-gobject-1-dev \