diff --git a/package.json b/package.json
index 44426c8..247dab4 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "@briancavalier/assert": "^3.4.0",
     "@most/core": "^1.5.0",
     "@most/scheduler": "^1.2.3",
-    "@types/mocha": "^5.2.7",
+    "@types/mocha": "^8.2.3",
     "@types/sinon": "^7.5.2",
     "cpy-cli": "^2.0.0",
     "cross-env": "^5.2.0",
diff --git a/yarn.lock b/yarn.lock
index c28662d..09e1a04 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -113,10 +113,10 @@
   resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-3.0.3.tgz#3dca0e3f33b200fc7d1139c0cd96c1268cadfd9d"
   integrity sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==
 
-"@types/mocha@^5.2.7":
-  version "5.2.7"
-  resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-5.2.7.tgz#315d570ccb56c53452ff8638738df60726d5b6ea"
-  integrity sha512-NYrtPht0wGzhwe9+/idPaBB+TqkY9AhTvOLMkThm0IoEfLaiVQZwBwyJ5puCkO3AUCWrmcoePjp2mbFocKy4SQ==
+"@types/mocha@^8.2.3":
+  version "8.2.3"
+  resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-8.2.3.tgz#bbeb55fbc73f28ea6de601fbfa4613f58d785323"
+  integrity sha512-ekGvFhFgrc2zYQoX4JeZPmVzZxw6Dtllga7iGHzfbYIYkAMUx/sAFP2GdFpLff+vdHXu5fl7WX9AT+TtqYcsyw==
 
 "@types/node@*":
   version "10.5.5"