diff --git a/Scripts/sql-update-5.5.1_to_5.6.0.sh b/Scripts/sql-update-5.5.1_to_5.6.0.sh
new file mode 100755
index 000000000..919445cb9
--- /dev/null
+++ b/Scripts/sql-update-5.5.1_to_5.6.0.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# This script only works with PostgreSQL and MySQL - it does:
+#
+# - increase the c_value column of sessions table to varchar(4096)
+
+sessiontype=$(sogo-tool dump-defaults -f /etc/sogo/sogo.conf | awk -F\" '/ OCSSessionsFolderURL =/  {print $2}' | awk -F: '{ print $1 }')
+
+if [ -z "$sessiontype" ]; then
+    echo "Failed to obtain session table type" >&2
+    exit 1
+fi
+
+if [[ "$sessiontype" == "postgresql" ]]; then
+    sessionurl=$(sogo-tool dump-defaults -f /etc/sogo/sogo.conf | awk -F\" '/ OCSSessionsFolderURL =/  {print $2}' | cut -d \/ -f1-4)
+    sessiontable=$(sogo-tool dump-defaults -f /etc/sogo/sogo.conf | awk -F\" '/ OCSSessionsFolderURL =/  {print $2}' | awk -F/ '{print $NF}')
+    echo "Converting c_value from VARCHAR(255) to VARCHAR(4096) in sessions table ($sessiontable)"
+    psql $sessionurl -c "ALTER TABLE $sessiontable ALTER COLUMN c_value TYPE VARCHAR(4096);"
+elif [[ "$sessiontype" == "mysql" ]]; then
+    sessiontable=$(sogo-tool dump-defaults -f /etc/sogo/sogo.conf | awk -F\" '/ OCSSessionsFolderURL =/  {print $2}' | awk -F/ '{print $NF}')
+    mysqlargs=$(sogo-tool dump-defaults -f /etc/sogo/sogo.conf | awk -F\" '/ OCSSessionsFolderURL =/  {print $2}' | sed 's/mysql:\/\/\([^:]\+\):\([^@]\+\)@\([^\:]\+\):\([^\/]\+\)\/\([^\/]\+\).\+/-h \3 -P \4 -u \1 -p\2 \5/')
+    echo "Converting c_value from VARCHAR(255) to VARCHAR(4096) in sessions table ($sessiontable)"
+    mysql -v $mysqlargs -e "ALTER TABLE $sessiontable MODIFY c_value VARCHAR(4096);"
+else
+    echo "Unsupported database type $sessiontype"
+    exit 1
+fi
+
+exit 0