diff --git a/package.json b/package.json
index 67bc502..3c64f96 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
     "hubot-redis-brain": "0.0.3",
     "hubot-scripts": "^2.17.2",
     "hubot-slack": "^4.3.4",
-    "moment-timezone": "^0.5.21",
+    "moment-timezone": "^0.5.35",
     "request": "^2.88.0",
     "sharp": "^0.21.0"
   },
diff --git a/yarn.lock b/yarn.lock
index b66d59e..3805ca1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2675,10 +2675,10 @@ mkdirp@^0.5.0, mkdirp@^0.5.1:
   dependencies:
     minimist "0.0.8"
 
-moment-timezone@^0.5.21:
-  version "0.5.25"
-  resolved "https://registry.yarnpkg.com/moment-timezone/-/moment-timezone-0.5.25.tgz#a11bfa2f74e088327f2cd4c08b3e7bdf55957810"
-  integrity sha512-DgEaTyN/z0HFaVcVbSyVCUU6HeFdnNC3vE4c9cgu2dgMTvjBUBdBzWfasTBmAW45u5OIMeCJtU8yNjM22DHucw==
+moment-timezone@^0.5.35:
+  version "0.5.35"
+  resolved "https://registry.yarnpkg.com/moment-timezone/-/moment-timezone-0.5.35.tgz#6fa2631bdbe8ff04f6b8753f7199516be6dc9839"
+  integrity sha512-cY/pBOEXepQvlgli06ttCTKcIf8cD1nmNwOKQQAdHBqYApQSpAqotBMX0RJZNgMp6i0PlZuf1mFtnlyEkwyvFw==
   dependencies:
     moment ">= 2.9.0"