diff --git a/binary-nbt/package.json b/binary-nbt/package.json
index 9f114af..107b757 100644
--- a/binary-nbt/package.json
+++ b/binary-nbt/package.json
@@ -40,7 +40,7 @@
         "@types/mkdirp": "0.5.2",
         "@types/mocha": "5.2.7",
         "@types/node": "10.0.3",
-        "mocha": "6.1.4",
+        "mocha": "9.0.0",
         "ts-mocha": "6.0.0",
         "tslint": "5.17.0",
         "typedoc": "0.14.2",
diff --git a/id/package.json b/id/package.json
index 82ac98e..d0f4d9a 100644
--- a/id/package.json
+++ b/id/package.json
@@ -27,7 +27,7 @@
     },
     "devDependencies": {
         "@types/mocha": "5.2.7",
-        "mocha": "6.1.4",
+        "mocha": "9.0.0",
         "ts-mocha": "6.0.0",
         "tslint": "5.17.0",
         "typedoc": "0.14.2",
diff --git a/result/package.json b/result/package.json
index 41a07fb..df1f2d8 100644
--- a/result/package.json
+++ b/result/package.json
@@ -27,7 +27,7 @@
     },
     "devDependencies": {
         "@types/mocha": "5.2.7",
-        "mocha": "6.1.4",
+        "mocha": "9.0.0",
         "ts-mocha": "6.0.0",
         "tslint": "5.17.0",
         "typedoc": "0.14.2",