diff --git a/.env b/.env
index af1645f7..b87cbb9b 100644
--- a/.env
+++ b/.env
@@ -7,4 +7,5 @@ GITHUB_CLIENT_ID=Iv23lisqArfcAbBMGOXe
 CLOUDFLARE_KV_SHORTLINKS_NAMESPACE=4f141ed7ad0b4113b8e61a53710b653f
 CLOUDFLARE_WORKER_ACCOUNT_ID=50396718bfac13dffb7727aad0e82150
 NEXT_PUBLIC_ALGOLIA_APP_ID=NT48R1WDTS
-NEXT_PUBLIC_ALGOLIA_SEARCH_KEY=6dfe4655a78904f8b01432e7db3b8d64
\ No newline at end of file
+NEXT_PUBLIC_ALGOLIA_SEARCH_KEY=6dfe4655a78904f8b01432e7db3b8d64
+NTHUMODS_OCR_BASE_URL=https://ocr.nthumods.com
\ No newline at end of file
diff --git a/src/lib/headless_ais.ts b/src/lib/headless_ais.ts
index e145d880..2e1c000d 100644
--- a/src/lib/headless_ais.ts
+++ b/src/lib/headless_ais.ts
@@ -207,7 +207,7 @@ export const signInToCCXP = async (
           //fetch the image from the url and send as base64
           console.log("Fetching CAPTCHA");
           answer = await fetch(
-            `https://ocr.nthumods.com/?url=https://www.ccxp.nthu.edu.tw/ccxp/INQUIRE/auth_img.php?pwdstr=${pwdstr}`,
+            `${process.env.NTHUMODS_OCR_BASE_URL}/?url=https://www.ccxp.nthu.edu.tw/ccxp/INQUIRE/auth_img.php?pwdstr=${pwdstr}`,
           ).then((res) => res.text());
           console.log("Time taken", Date.now() - startTime);
           startTime = Date.now();
diff --git a/src/lib/scrapers/course.ts b/src/lib/scrapers/course.ts
index 689d9987..5836ff0a 100644
--- a/src/lib/scrapers/course.ts
+++ b/src/lib/scrapers/course.ts
@@ -51,7 +51,7 @@ export const scrapeArchivedCourses = async (semester: string) => {
     //fetch the image from the url and send as base64
     console.log("ACIXSTORE: ", ACIXSTORE);
     answer = await fetch(
-      `https://ocr.nthumods.com/?url=https://www.ccxp.nthu.edu.tw/ccxp/INQUIRE/JH/mod/auth_img/auth_img.php?ACIXSTORE=${ACIXSTORE}`,
+      `${process.env.NTHUMODS_OCR_BASE_URL}/?url=https://www.ccxp.nthu.edu.tw/ccxp/INQUIRE/JH/mod/auth_img/auth_img.php?ACIXSTORE=${ACIXSTORE}`,
     ).then((res) => res.text());
     console.log(answer);
     if (answer.length == 3) break;