diff --git a/taskcluster/docker/firefox-flatpak/Dockerfile b/taskcluster/docker/firefox-flatpak/Dockerfile
index 830693c2a0a4..b59c697f1324 100644
--- a/taskcluster/docker/firefox-flatpak/Dockerfile
+++ b/taskcluster/docker/firefox-flatpak/Dockerfile
@@ -1,4 +1,4 @@
-FROM freedesktopsdk/flatpak:22.08-x86_64
+FROM freedesktopsdk/flatpak:21.08-x86_64
 MAINTAINER release@mozilla.com
 
 RUN mkdir /scripts/
diff --git a/taskcluster/docker/firefox-flatpak/runme.sh b/taskcluster/docker/firefox-flatpak/runme.sh
index 6766af3362da..ccde193b6404 100755
--- a/taskcluster/docker/firefox-flatpak/runme.sh
+++ b/taskcluster/docker/firefox-flatpak/runme.sh
@@ -25,8 +25,8 @@ export DATE
 SCRIPT_DIRECTORY="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 TARGET_TAR_XZ_FULL_PATH="$ARTIFACTS_DIR/target.flatpak.tar.xz"
 SOURCE_DEST="${WORKSPACE}/source"
-FREEDESKTOP_VERSION="22.08"
-FIREFOX_BASEAPP_CHANNEL="22.08"
+FREEDESKTOP_VERSION="21.08"
+FIREFOX_BASEAPP_CHANNEL="21.08"
 
 
 # XXX: these commands are temporarily, there's an upcoming fix in the upstream Docker image