diff --git a/util/update_chibios_mirror.sh b/util/update_chibios_mirror.sh
new file mode 100755
index 000000000000..3df689f54e50
--- /dev/null
+++ b/util/update_chibios_mirror.sh
@@ -0,0 +1,55 @@
+#!/bin/bash
+
+################################
+# Configuration
+
+# The branches to mirror
+branches="trunk stable_20.3.x stable_21.6.x"
+
+# The tags to mirror
+tags="ver19.1.3 ver20.3.1 ver20.3.2 ver20.3.3 ver21.6.0"
+
+################################
+# Actions
+
+set -eEuo pipefail
+umask 022
+
+this_script="$(realpath "${BASH_SOURCE[0]}")"
+script_dir="$(realpath "$(dirname "$this_script")")"
+qmk_firmware_dir="$(realpath "$script_dir/../")"
+chibios_dir="$qmk_firmware_dir/lib/chibios"
+
+chibios_git_location=$(realpath "$chibios_dir/$(cat "$chibios_dir/.git" | awk '/gitdir:/ {print $2}')")
+chibios_git_config=$(realpath "$chibios_git_location/config")
+
+cd "$chibios_dir"
+
+if [[ -z "$(cat "$chibios_git_config" | grep '\[svn-remote "svn"\]')" ]] ; then
+    git svn init --stdlayout --prefix='svn/' http://svn.osdn.net/svnroot/chibios/
+fi
+
+if [[ -z "$(cat "$chibios_git_config" | grep '\[remote "qmk"\]')" ]] ; then
+    git remote add qmk git@github.com:qmk/ChibiOS.git
+    git remote set-url qmk git@github.com:qmk/ChibiOS.git --push
+fi
+
+echo "Updating remotes..."
+git fetch --all --tags --prune
+
+echo "Fetching latest from subversion..."
+git svn fetch
+
+echo "Updating branches..."
+for branch in $branches ; do
+    echo "Creating branch 'svn-mirror/$branch' from 'svn/$branch'..."
+    git branch -f svn-mirror/$branch svn/$branch \
+        && git push qmk svn-mirror/$branch
+done
+
+echo "Updating tags..."
+for tagname in $tags ; do
+    echo "Creating tag 'svn-mirror/$tagname' from 'svn/tags/$tagname'..."
+    GIT_COMMITTER_DATE="$(git log -n1 --pretty=format:'%ad' svn/tags/$tagname)" git tag -f -a -m "Tagging $tagname" svn-mirror/$tagname svn/tags/$tagname
+    git push qmk svn-mirror/$tagname
+done
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