diff --git a/package.json b/package.json
index 38c82af..ad4de58 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "gitbook-cli": "^2.3.2",
     "node-sass": "^4.7.2",
     "prism-theme-one-dark": "^1.0.0",
-    "prismjs": "^1.11.0"
+    "prismjs": "^1.21.0"
   },
   "scripts": {
     "start": "gitbook install && gitbook serve",
diff --git a/yarn.lock b/yarn.lock
index d2c3207..5c87ecf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -542,9 +542,9 @@ cli-boxes@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/cli-boxes/-/cli-boxes-1.0.0.tgz#4fa917c3e59c94a004cd61f8ee509da651687143"
 
-clipboard@^1.7.1:
-  version "1.7.1"
-  resolved "https://registry.yarnpkg.com/clipboard/-/clipboard-1.7.1.tgz#360d6d6946e99a7a1fef395e42ba92b5e9b5a16b"
+clipboard@^2.0.0:
+  version "2.0.6"
+  resolved "https://registry.yarnpkg.com/clipboard/-/clipboard-2.0.6.tgz#52921296eec0fdf77ead1749421b21c968647376"
   dependencies:
     good-listener "^1.2.2"
     select "^1.1.2"
@@ -2811,11 +2811,11 @@ prism-theme-one-dark@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/prism-theme-one-dark/-/prism-theme-one-dark-1.0.0.tgz#c973609196aed4d1f98f9786ad724cdb5937e3ae"
 
-prismjs@^1.11.0:
-  version "1.11.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.11.0.tgz#297aef33eb79421bfdb19273a5092ca515970d29"
+prismjs@^1.21.0:
+  version "1.21.0"
+  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.21.0.tgz#36c086ec36b45319ec4218ee164c110f9fc015a3"
   optionalDependencies:
-    clipboard "^1.7.1"
+    clipboard "^2.0.0"
 
 process-nextick-args@~1.0.6:
   version "1.0.7"