diff --git a/package.json b/package.json
index e56e0b2..f4f2aad 100644
--- a/package.json
+++ b/package.json
@@ -111,7 +111,7 @@
     "postcss-normalize": "8.0.1",
     "postcss-preset-env": "6.7.0",
     "postcss-safe-parser": "4.0.1",
-    "prismjs": "^1.18.0",
+    "prismjs": "^1.21.0",
     "react": "^16.12.0",
     "react-app-polyfill": "^1.0.5",
     "react-big-calendar": "^0.24.0",
diff --git a/yarn.lock b/yarn.lock
index 10dedfe..4321ac8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -12263,17 +12263,10 @@ prism-react-renderer@^1.0.2:
   resolved "https://registry.yarnpkg.com/prism-react-renderer/-/prism-react-renderer-1.0.2.tgz#3bb9a6a42f76fc049b03266298c7068fdd4b7ea9"
   integrity sha512-0++pJyRfu4v2OxI/Us/5RLui9ESDkTiLkVCtKuPZYdpB8UQWJpnJQhPrWab053XtsKW3oM0sD69uJ6N9exm1Ag==
 
-prismjs@^1.18.0:
-  version "1.18.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.18.0.tgz#8f04dd47fa232cbd27d1ca969107580ff43f06e4"
-  integrity sha512-N0r3i/Cto516V8+GKKamhsPVZSFcO0TMUBtIDW6uq6BVqoC3FNtZVZ+cmH16N2XtGQlgRN+sFUTjOdCsEP51qw==
-  optionalDependencies:
-    clipboard "^2.0.0"
-
-prismjs@^1.8.4:
-  version "1.19.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.19.0.tgz#713afbd45c3baca4b321569f2df39e17e729d4dc"
-  integrity sha512-IVFtbW9mCWm9eOIaEkNyo2Vl4NnEifis2GQ7/MLRG5TQe6t+4Sj9J5QWI9i3v+SS43uZBlCAOn+zYTVYQcPXJw==
+prismjs@^1.21.0, prismjs@^1.8.4:
+  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"