diff --git a/schemas/ispyb/updates/2024_03_20_Shipping_Dewar_externalIds.sql b/schemas/ispyb/updates/2024_03_20_Shipping_Dewar_externalIds.sql
new file mode 100644
index 00000000..4dd202a5
--- /dev/null
+++ b/schemas/ispyb/updates/2024_03_20_Shipping_Dewar_externalIds.sql
@@ -0,0 +1,11 @@
+INSERT IGNORE INTO SchemaStatus (scriptName, schemaStatus) VALUES ('2024_03_20_Shipping_Dewar_externalIds.sql', 'ONGOING');
+
+ALTER TABLE Shipping
+  ADD COLUMN `externalShippingIdToSynchrotron` int(11) unsigned
+    COMMENT 'ID for shipping to synchrotron in external application';
+
+ALTER TABLE Dewar
+  ADD COLUMN `externalShippingIdFromSynchrotron` int(11) unsigned
+    COMMENT 'ID for shipping from synchrotron in external application';
+
+UPDATE SchemaStatus SET schemaStatus = 'DONE' WHERE scriptName = '2024_03_20_Shipping_Dewar_externalIds.sql';