diff --git a/config/vite/plugin-mastodon-themes.ts b/config/vite/plugin-mastodon-themes.ts
index 9789d9078a8..84642ce81db 100644
--- a/config/vite/plugin-mastodon-themes.ts
+++ b/config/vite/plugin-mastodon-themes.ts
@@ -4,7 +4,7 @@
 import fs from 'node:fs/promises';
 import path from 'node:path';
 
-import yaml from 'js-yaml';
+import * as yaml from 'js-yaml';
 import type { Plugin } from 'vite';
 
 type Themes = Record<string, string>;
diff --git a/package.json b/package.json
index 5637423135f..f29d2ba6f8d 100644
--- a/package.json
+++ b/package.json
@@ -84,7 +84,7 @@
     "idb": "^8.0.3",
     "immutable": "^4.3.0",
     "intl-messageformat": "^11.0.0",
-    "js-yaml": "^4.1.0",
+    "js-yaml": "^5.2.1",
     "lande": "^1.0.10",
     "lodash": "^4.17.21",
     "marky": "^1.2.5",
diff --git a/yarn.lock b/yarn.lock
index e7bbd446218..9520fe6c336 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3010,7 +3010,7 @@ __metadata:
     idb: "npm:^8.0.3"
     immutable: "npm:^4.3.0"
     intl-messageformat: "npm:^11.0.0"
-    js-yaml: "npm:^4.1.0"
+    js-yaml: "npm:^5.2.1"
     lande: "npm:^1.0.10"
     lint-staged: "npm:^17.0.0"
     lodash: "npm:^4.17.21"
@@ -9461,6 +9461,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"js-yaml@npm:^5.2.1":
+  version: 5.2.1
+  resolution: "js-yaml@npm:5.2.1"
+  dependencies:
+    argparse: "npm:^2.0.1"
+  bin:
+    js-yaml: bin/js-yaml.mjs
+  checksum: 10c0/8eadf08efc738a656c2838f6617b0cc508944f66f568eb4d435e858261b889a6806d98f44fb6ffdba21a0c68e4bdff1ac35516724882e1dab8fc2cc59150c881
+  languageName: node
+  linkType: hard
+
 "jsdoc-type-pratt-parser@npm:~7.2.0":
   version: 7.2.0
   resolution: "jsdoc-type-pratt-parser@npm:7.2.0"