diff --git a/package.json b/package.json
index d03594a..dbcc626 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     },
     "homepage": "https://github.com/TypeScript-Web-Framework/ts-web-framework",
     "dependencies": {
-        "ansi-colors": "^3.0.0",
+        "ansi-colors": "^4.0.1",
         "body-parser": "^1.15.2",
         "cookie-parser": "^1.4.3",
         "cookie-session": "^2.0.0-beta.3",
diff --git a/yarn.lock b/yarn.lock
index 78b8030..2921df3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -381,9 +381,10 @@ ansi-colors@3.2.3:
   resolved "https://registry.yarnpkg.com/ansi-colors/-/ansi-colors-3.2.3.tgz#57d35b8686e851e2cc04c403f1c00203976a1813"
   integrity sha512-LEHHyuhlPY3TmuUYMh2oz89lTShfvgbmzaBcxve9t/9Wuy7Dwf4yoAKcND7KFT1HAQfqZ12qtc+DUrBMeKF9nw==
 
-ansi-colors@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/ansi-colors/-/ansi-colors-3.0.0.tgz#729de5fc073e8ac5dc6bb236d0ebc1432a496066"
+ansi-colors@^4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/ansi-colors/-/ansi-colors-4.0.1.tgz#3dc29301836c6152f617a71466bde162a2e42582"
+  integrity sha512-1Qs1jdXEMSYwcVooLRfnCc5+e3365pw38v4AVkSsCxsjXRGKDTem5VLCl53SpHSpLnEy8O5DofJHZJELaRiJbg==
 
 ansi-escapes@^3.0.0, ansi-escapes@^3.1.0:
   version "3.1.0"