diff --git a/package.json b/package.json
index b12417d..edf7e36 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "draft-js-static-toolbar-plugin": "^3.0.0",
     "immutable": "^4.0.0-rc.12",
     "prettyjson": "^1.2.1",
-    "prismjs": "^1.15.0",
+    "prismjs": "^1.21.0",
     "react": "^16.7.0",
     "react-dom": "^16.7.0",
     "react-scripts": "2.1.3"
diff --git a/yarn.lock b/yarn.lock
index dfa6fb0..11c8c55 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6939,9 +6939,9 @@ prettyjson@^1.2.1:
     colors "^1.1.2"
     minimist "^1.2.0"
 
-prismjs@^1.15.0:
-  version "1.15.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.15.0.tgz#8801d332e472091ba8def94976c8877ad60398d9"
+prismjs@^1.21.0:
+  version "1.21.0"
+  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.21.0.tgz#36c086ec36b45319ec4218ee164c110f9fc015a3"
   optionalDependencies:
     clipboard "^2.0.0"