diff --git a/package.json b/package.json
index f0de91a..6109b60 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,6 @@
         "ajv": "^6.12.2",
         "npm-run-all": "^4.1.5",
         "ts-node": "^8.10.2",
-        "tsc": "^1.20150623.0",
         "typescript": "^3.9.5",
         "vsce": "^1.77.0",
         "vscode-tmgrammar-test": "0.0.10"
diff --git a/yarn.lock b/yarn.lock
index f925364..1f31cb7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -808,11 +808,6 @@ ts-node@^8.10.2:
     source-map-support "^0.5.17"
     yn "3.1.1"
 
-tsc@^1.20150623.0:
-  version "1.20150623.0"
-  resolved "https://registry.yarnpkg.com/tsc/-/tsc-1.20150623.0.tgz#4ebc3c774e169148cbc768a7342533f082c7a6e5"
-  integrity sha1-Trw8d04WkUjLx2inNCUz8ILHpuU=
-
 tunnel@0.0.4:
   version "0.0.4"
   resolved "https://registry.yarnpkg.com/tunnel/-/tunnel-0.0.4.tgz#2d3785a158c174c9a16dc2c046ec5fc5f1742213"