diff --git a/package.json b/package.json
index 65c8b537..6cd6d14f 100644
--- a/package.json
+++ b/package.json
@@ -139,7 +139,7 @@
     "@eslint/eslintrc": "3.3.5",
     "@eslint/js": "9.39.4",
     "@hedgedoc/codemirror-5": "5.65.12",
-    "abcjs": "6.6.2",
+    "abcjs": "6.6.3",
     "babel-cli": "6.26.0",
     "babel-core": "6.26.3",
     "babel-loader": "7.1.5",
diff --git a/yarn.lock b/yarn.lock
index bb2103c7..f0174d0c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1505,7 +1505,7 @@ __metadata:
     "@node-saml/passport-saml": "npm:5.1.0"
     "@passport-next/passport-openid": "npm:1.0.0"
     Idle.Js: "git+https://github.com/shawnmclean/Idle.js#commit=2b57cc6e49d177b7ddce0cca00ef5cbe07453541"
-    abcjs: "npm:6.6.2"
+    abcjs: "npm:6.6.3"
     archiver: "npm:7.0.1"
     async: "npm:3.2.6"
     aws-sdk: "npm:2.1693.0"
@@ -1700,10 +1700,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"abcjs@npm:6.6.2":
-  version: 6.6.2
-  resolution: "abcjs@npm:6.6.2"
-  checksum: 10/f026bbbf38fb14bb8d711cb5222a2e6f2380dff9de3cc6a094135dd8a6612190a67fc1640e244309067d0379675ca48988c850c1fb0a0226ba20a2fbd5c549b8
+"abcjs@npm:6.6.3":
+  version: 6.6.3
+  resolution: "abcjs@npm:6.6.3"
+  checksum: 10/7975552dcb9b7269a37b3d05c830021b44ceac8d49afa0c74e98def0dd759db0e57359c0c4cf8a0e6be4b7c5a8cbaf7c284b17d8a0ae3688153509e5aee56460
   languageName: node
   linkType: hard