diff --git a/package.json b/package.json
index 44426c8..792b813 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": "^9.0.7",
     "cpy-cli": "^2.0.0",
     "cross-env": "^5.2.0",
     "flow-bin": "^0.89.0",
diff --git a/yarn.lock b/yarn.lock
index 1a55a8d..e5eea8d 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@^9.0.7":
+  version "9.0.7"
+  resolved "https://registry.yarnpkg.com/@types/sinon/-/sinon-9.0.7.tgz#c277e19cf9eb0c71106e785650f1e5c299262302"
+  integrity sha512-uyFiy2gp4P/FK9pmU3WIbT5ZzH54hCswwRkQFhxX7xl8jzhW3g+xOkVqk5YP4cIO//Few8UDAX0MtzFpqBEqwA==
+  dependencies:
+    "@types/sinonjs__fake-timers" "*"
+
+"@types/sinonjs__fake-timers@*":
+  version "6.0.2"
+  resolved "https://registry.yarnpkg.com/@types/sinonjs__fake-timers/-/sinonjs__fake-timers-6.0.2.tgz#3a84cf5ec3249439015e14049bd3161419bf9eae"
+  integrity sha512-dIPoZ3g5gcx9zZEszaxLSVTvMReD3xxyyDnQUjA6IYDG9Ba2AV0otMPs+77sG9ojB4Qr2N2Vk5RnKeuA0X/0bg==
 
 acorn@^7.1.0:
   version "7.1.1"