diff --git a/package-lock.json b/package-lock.json
index df11a76..c14ad80 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "strontium",
-  "version": "2.9.11",
+  "version": "2.9.12",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -251,9 +251,18 @@
       }
     },
     "@types/sinon": {
-      "version": "5.0.2",
-      "resolved": "https://registry.npmjs.org/@types/sinon/-/sinon-5.0.2.tgz",
-      "integrity": "sha512-ifYuFq3GWyvRbqebGB4ZKLqezMGLXzhHv1Uefhg+uARYs/iO+v6Gu/BkpxTxsyM9NI++N/RCf5sWl3X9wBVLaw==",
+      "version": "9.0.1",
+      "resolved": "https://registry.npmjs.org/@types/sinon/-/sinon-9.0.1.tgz",
+      "integrity": "sha512-vqWk3K1HYJExooYgORUdiGX1EdCWQxPi7P/OEIetdaJn4jNvEYoRRGLG/HwomtbzZ4IP9Syz2k4N50CItv6w6g==",
+      "dev": true,
+      "requires": {
+        "@types/sinonjs__fake-timers": "*"
+      }
+    },
+    "@types/sinonjs__fake-timers": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/@types/sinonjs__fake-timers/-/sinonjs__fake-timers-6.0.1.tgz",
+      "integrity": "sha512-yYezQwGWty8ziyYLdZjwxyMb0CZR49h8JALHGrxjQHWlqGgc8kLdHEgWrgL0uZ29DMvEVBDnHU2Wg36zKSIUtA==",
       "dev": true
     },
     "@types/uuid": {
diff --git a/package.json b/package.json
index 1cad7a0..8b72cf7 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "@types/chai": "^4.1.6",
     "@types/chai-as-promised": "^7.1.0",
     "@types/mocha": "^5.2.5",
-    "@types/sinon": "^5.0.2",
+    "@types/sinon": "^9.0.1",
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
     "coveralls": "^3.0.2",