diff --git a/pkgs/applications/version-management/redmine/update.sh b/pkgs/applications/version-management/redmine/update.sh
new file mode 100755
index 000000000000..de59f4685d5c
--- /dev/null
+++ b/pkgs/applications/version-management/redmine/update.sh
@@ -0,0 +1,17 @@
+#!/usr/bin/env nix-shell
+#!nix-shell --pure -i bash -p cacert bundix
+
+# Do these steps before running this script:
+#   1. Copy Gemfile from new Redmine version to this folder
+#   2. Manually modify the database lines in Gemfile (diff the two files, it's obvious)
+
+pkg_dir="$(dirname "$0")"
+cd ${pkg_dir}
+
+for file in "gemset.nix" "Gemfile.lock"; do
+  if [ -f ${file} ]; then
+    rm ${file}
+  fi
+done
+
+bundix -l