diff --git a/upgrade.sh b/upgrade.sh
new file mode 100644
index 0000000..17725e1
--- /dev/null
+++ b/upgrade.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -x
+
+docker run --rm  \
+  -v /${CWD}://tmp  \
+  -v openstreetmap-data://var/lib/postgresql/12/main  \
+  -w //tmp  \
+  postgres:12 \
+  pg_dumpall -c -v -U prostgres > dump.sql
+
+docker run --rm  \
+  -v /${CWD}://tmp  \
+  -v openstreetmap-data://var/lib/postgresql/13/main  \
+  -w //tmp  \
+  postgres:13  \
+  psql -U postgres -d gis < dump.sql
+
+rm ./dump.sql