diff --git a/kotopunter-js/package.json b/kotopunter-js/package.json
index f2e770e..2fa8550 100644
--- a/kotopunter-js/package.json
+++ b/kotopunter-js/package.json
@@ -58,7 +58,7 @@
     "babel-preset-es2015": "~6.24.1",
     "babel-preset-es2016": "~6.24.1",
     "babel-preset-es2017": "~6.24.1",
-    "bootstrap": "^3.3.7",
+    "bootstrap": "^3.4.1",
     "bootstrap-social": "~5.1.1",
     "codemirror": "~5.30.0",
     "font-awesome": "~4.7.0",
diff --git a/kotopunter-js/yarn.lock b/kotopunter-js/yarn.lock
index 4d0473c..851eda2 100644
--- a/kotopunter-js/yarn.lock
+++ b/kotopunter-js/yarn.lock
@@ -1169,9 +1169,9 @@ bootstrap-social@~5.1.1:
     bootstrap "~3"
     font-awesome "~4.7"
 
-bootstrap@^3.3.7, bootstrap@~3:
-  version "3.3.7"
-  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-3.3.7.tgz#5a389394549f23330875a3b150656574f8a9eb71"
+bootstrap@^3.4.1, bootstrap@~3:
+  version "3.4.1"
+  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-3.4.1.tgz#c3a347d419e289ad11f4033e3c4132b87c081d72"
 
 bowser@^1.0.0:
   version "1.8.0"