diff --git a/package.json b/package.json
index b5bf5f3..e36c887 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,8 @@
     "url": "https://github.com/pengx17/monaco-yaml/issues"
   },
   "dependencies": {
-    "yaml-language-server": "^0.11.1"
+    "js-yaml": "^4.0.0",
+    "yaml-ast-parser-custom-tags": "^0.0.43"
   },
   "devDependencies": {
     "husky": "^5.2.0",
@@ -47,7 +48,8 @@
     "requirejs": "^2.3.6",
     "rimraf": "^2.6.2",
     "typescript": "^4.2.3",
-    "uglify-es": "^3.3.9"
+    "uglify-es": "^3.3.9",
+    "yaml-language-server": "^0.11.1"
   },
   "prettier": {
     "singleQuote": true,
diff --git a/yarn.lock b/yarn.lock
index 53a185f..f472460 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -87,6 +87,11 @@ argparse@^1.0.7:
   dependencies:
     sprintf-js "~1.0.2"
 
+argparse@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/argparse/-/argparse-2.0.1.tgz#246f50f3ca78a3240f6c997e8a9bd1eac49e4b38"
+  integrity sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==
+
 astral-regex@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/astral-regex/-/astral-regex-2.0.0.tgz#483143c567aeed4785759c0865786dc77d7d2e31"
@@ -455,6 +460,13 @@ js-yaml@^3.13.1:
     argparse "^1.0.7"
     esprima "^4.0.0"
 
+js-yaml@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-4.0.0.tgz#f426bc0ff4b4051926cd588c71113183409a121f"
+  integrity sha512-pqon0s+4ScYUvX30wxQi3PogGFAlUyH0awepWvwkj4jD4v+ova3RiYw8bmA6x2rDrEaj8i/oWKoRxpVNW+Re8Q==
+  dependencies:
+    argparse "^2.0.1"
+
 json-parse-even-better-errors@^2.3.0:
   version "2.3.1"
   resolved "https://registry.yarnpkg.com/json-parse-even-better-errors/-/json-parse-even-better-errors-2.3.1.tgz#7c47805a94319928e05777405dc12e1f7a4ee02d"
@@ -957,7 +969,7 @@ wrappy@1:
   resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
   integrity sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=
 
-yaml-ast-parser-custom-tags@0.0.43:
+yaml-ast-parser-custom-tags@0.0.43, yaml-ast-parser-custom-tags@^0.0.43:
   version "0.0.43"
   resolved "https://registry.yarnpkg.com/yaml-ast-parser-custom-tags/-/yaml-ast-parser-custom-tags-0.0.43.tgz#46968145ce4e24cb03c3312057f0f141b93a7d02"
   integrity sha512-R5063FF/JSAN6qXCmylwjt9PcDH6M0ExEme/nJBzLspc6FJDmHHIqM7xh2WfEmsTJqClF79A9VkXjkAqmZw9SQ==