diff --git a/package.json b/package.json
index df43645..8f4b2a5 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "connected-react-router": "^6.6.1",
     "history": "^4.10.1",
     "marked": "^0.7.0",
-    "prismjs": "^1.17.1",
+    "prismjs": "^1.21.0",
     "prop-types": "^15.7.2",
     "react": "^16.12.0",
     "react-app-polyfill": "^1.0.4",
diff --git a/yarn.lock b/yarn.lock
index f12b5cc..f847dd3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -8799,10 +8799,10 @@ pretty-format@^24.9.0:
     ansi-styles "^3.2.0"
     react-is "^16.8.4"
 
-prismjs@^1.17.1:
-  version "1.17.1"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.17.1.tgz#e669fcbd4cdd873c35102881c33b14d0d68519be"
-  integrity sha512-PrEDJAFdUGbOP6xK/UsfkC5ghJsPJviKgnQOoxaDbBjwc8op68Quupwt1DeAFoG8GImPhiKXAvvsH7wDSLsu1Q==
+prismjs@^1.21.0:
+  version "1.21.0"
+  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.21.0.tgz#36c086ec36b45319ec4218ee164c110f9fc015a3"
+  integrity sha512-uGdSIu1nk3kej2iZsLyDoJ7e9bnPzIgY0naW/HdknGj61zScaprVEVGHrPoXqI+M9sP0NDnTK2jpkvmldpuqDw==
   optionalDependencies:
     clipboard "^2.0.0"