diff --git a/package.json b/package.json
index 44426c8..fdd0bc6 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "@most/core": "^1.5.0",
     "@most/scheduler": "^1.2.3",
     "@types/mocha": "^5.2.7",
-    "@types/sinon": "^7.5.2",
+    "@types/sinon": "^9.0.4",
     "cpy-cli": "^2.0.0",
     "cross-env": "^5.2.0",
     "flow-bin": "^0.89.0",
diff --git a/yarn.lock b/yarn.lock
index 69c74d0..8f893c7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -129,10 +129,17 @@
   dependencies:
     "@types/node" "*"
 
-"@types/sinon@^7.5.2":
-  version "7.5.2"
-  resolved "https://registry.yarnpkg.com/@types/sinon/-/sinon-7.5.2.tgz#5e2f1d120f07b9cda07e5dedd4f3bf8888fccdb9"
-  integrity sha512-T+m89VdXj/eidZyejvmoP9jivXgBDdkOSBVQjU9kF349NEx10QdPNGxHeZUaj1IlJ32/ewdyXJjnJxyxJroYwg==
+"@types/sinon@^9.0.4":
+  version "9.0.4"
+  resolved "https://registry.yarnpkg.com/@types/sinon/-/sinon-9.0.4.tgz#e934f904606632287a6e7f7ab0ce3f08a0dad4b1"
+  integrity sha512-sJmb32asJZY6Z2u09bl0G2wglSxDlROlAejCjsnor+LzBMz17gu8IU7vKC/vWDnv9zEq2wqADHVXFjf4eE8Gdw==
+  dependencies:
+    "@types/sinonjs__fake-timers" "*"
+
+"@types/sinonjs__fake-timers@*":
+  version "6.0.1"
+  resolved "https://registry.yarnpkg.com/@types/sinonjs__fake-timers/-/sinonjs__fake-timers-6.0.1.tgz#681df970358c82836b42f989188d133e218c458e"
+  integrity sha512-yYezQwGWty8ziyYLdZjwxyMb0CZR49h8JALHGrxjQHWlqGgc8kLdHEgWrgL0uZ29DMvEVBDnHU2Wg36zKSIUtA==
 
 acorn@^7.1.0:
   version "7.1.1"