diff --git a/package.json b/package.json
index d131485..e7e9537 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
     "rollup-plugin-typescript2": "0.25.3",
     "rollup-plugin-yaml": "2.0.0",
     "sinon": "8.0.1",
-    "sinon-chai": "3.3.0",
+    "sinon-chai": "3.4.0",
     "source-map-support": "0.5.16",
     "standard-version": "7.0.1",
     "tslint": "5.20.0",
diff --git a/yarn.lock b/yarn.lock
index 8ebf6fe..2d72a5e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3247,10 +3247,10 @@ signal-exit@^3.0.0, signal-exit@^3.0.2:
   resolved "https://artifacts.apextoaster.com/repository/group-npm/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
   integrity sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=
 
-sinon-chai@3.3.0:
-  version "3.3.0"
-  resolved "https://artifacts.apextoaster.com/repository/group-npm/sinon-chai/-/sinon-chai-3.3.0.tgz#8084ff99451064910fbe2c2cb8ab540c00b740ea"
-  integrity sha512-r2JhDY7gbbmh5z3Q62pNbrjxZdOAjpsqW/8yxAZRSqLZqowmfGZPGUZPFf3UX36NLis0cv8VEM5IJh9HgkSOAA==
+sinon-chai@3.4.0:
+  version "3.4.0"
+  resolved "https://artifacts.apextoaster.com/repository/group-npm/sinon-chai/-/sinon-chai-3.4.0.tgz#06fb88dee80decc565106a3061d380007f21e18d"
+  integrity sha512-BpVxsjEkGi6XPbDXrgWUe7Cb1ZzIfxKUbu/MmH5RoUnS7AXpKo3aIYIyQUg0FMvlUL05aPt7VZuAdaeQhEnWxg==
 
 sinon@8.0.1:
   version "8.0.1"