diff --git a/src/updateDuplicatePrintings.ts b/src/updateDuplicatePrintings.ts
new file mode 100644
index 000000000..82d311af6
--- /dev/null
+++ b/src/updateDuplicatePrintings.ts
@@ -0,0 +1,127 @@
+// Given a v1 pack, update all other printings of cards in that pack to the
+// values in the specified pack.
+// Quiet a lint warning up since we know our data exists.
+/* eslint-disable @typescript-eslint/no-non-null-assertion */
+
+import fs from "fs";
+import { resolve } from "path";
+import commandLineArgs = require('command-line-args');
+import prettier from "prettier";
+
+const optionDefinitions = [
+    { name: 'source_printing_file', description: 'Path to the source pack to use for the updates.', alias: 'p', type: String }
+];
+const options = commandLineArgs(optionDefinitions);
+
+if (!options.source_printing_file) {
+    console.error("You must provide a path to the source pack --source_printing_file or -p.");
+    process.exit(1);
+}
+
+async function formatJSON(text) {
+    const data = JSON.stringify(text);
+    return await prettier.format(data, {
+        jsonRecursiveSort: true,
+        parser: "json",
+        plugins: ["prettier-plugin-sort-json"],
+    });
+}
+
+// Read v2 printings file.
+console.log(`Input printing file is ${options.source_printing_file}`);
+const source_printings = JSON.parse(fs.readFileSync(options.source_printing_file, "utf-8"));
+
+// Maps and sets to keep track of what needs to be updated.
+const cardIds = new Set<string>();
+const sourcePrintingIds = new Set<string>();
+const cardIdToPrintingIds = new Map<string, Array<string>>();
+const v2CardsById = new Map<string, any>();
+const v2PrintingsById = new Map<string, any>();
+const packsNeedingUpdates = new Set<string>();
+const printingIdToCardId = new Map<string, string>();
+
+// Make a set of card ids from the updated printing file. This is the target set to use for updates.
+// Make a map of printing id -> card_id for all cards.
+// Read all v2 printing files
+//   for each printing,
+//     if the card id is in the card ids map.
+//       add to a map of card_id -> [printing id]
+source_printings.forEach(p => {
+    cardIds.add(p.card_id);
+    sourcePrintingIds.add(p.id);
+    if (!cardIdToPrintingIds.has(p.card_id)) {
+        cardIdToPrintingIds.set(p.card_id, new Array<string>());
+    }
+    cardIdToPrintingIds.get(p.card_id)?.push(p.id);
+    v2PrintingsById.set(p.id, p);
+    printingIdToCardId.set(p.id, p.card_id);
+});
+
+// Load all the v2 card files in the source set.
+const v2CardsDir = resolve(__dirname, '..', 'v2/cards');
+cardIds.forEach(card_id => {
+    const path = resolve(v2CardsDir, `${card_id}.json`);
+    const json = JSON.parse(fs.readFileSync(path, 'utf-8'));
+    v2CardsById.set(card_id, json);
+});
+
+// Find all the duplicate printings.
+const printingDir = resolve(__dirname, '..', 'v2/printings');
+fs.readdirSync(printingDir).forEach(file => {
+    if (file.endsWith('.json')) {
+        const path = resolve(printingDir, file);
+        const json = JSON.parse(fs.readFileSync(path, 'utf-8'));
+        json.forEach(c => {
+            printingIdToCardId.set(c.id, c.card_id);
+            if (cardIds.has(c.card_id) && !sourcePrintingIds.has(c.id)) {
+                console.log(`Found another printing for card ${c.card_id}: ${c.id}`);
+                cardIdToPrintingIds.get(c.card_id)?.push(c.id);
+            }
+        });
+    }
+});
+
+// Iterate over all the v1 pack files and identify the ones that need updates.
+const packsDir = resolve(__dirname, '..', 'pack');
+fs.readdirSync(packsDir).forEach(file => {
+    if (file.endsWith('.json')) {
+        const path = resolve(packsDir, file);
+        console.log(`Reading pack in ${path}`);
+        const json = JSON.parse(fs.readFileSync(path, 'utf-8'));
+        json.forEach(p => {
+            if (cardIds.has(printingIdToCardId.get(p.code)!)) {
+                packsNeedingUpdates.add(path);
+            }
+        });
+    }
+});
+
+packsNeedingUpdates.forEach(p => {
+    console.log(`Need to update pack file ${p}`);
+    const v1 = new Array<any>();
+    const json = JSON.parse(fs.readFileSync(resolve(p), 'utf-8'));
+    json.forEach((printing: any) => {
+        if (cardIds.has(printingIdToCardId.get(printing.code)!)) {
+            console.log(`Need to update printing ${printing.code} (${printing.title})`);
+            const newCard = v2CardsById.get(printingIdToCardId.get(printing.code)!);
+            printing.title = newCard.title;
+            printing.stripped_title = newCard.stripped_title;
+            printing.text = newCard.text;
+            printing.stripped_text = newCard.stripped_text;
+        }
+        v1.push(printing);
+    });
+
+    // Write out the updated pack file, including prettier formatting.
+    formatJSON(v1).then((content) => {
+        fs.writeFile(
+            resolve(p),
+            content,
+            function (err) {
+                if (err) {
+                    console.log(`Could not write updated pack to ${p}: ${err}`);
+                }
+            },
+        );
+    });
+})