diff --git a/package.json b/package.json
index e8258f5..66a136e 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "compression": "^1.7.1",
     "highlight.js": "^9.15.8",
     "polka": "^0.5.0",
-    "prismjs": "^1.16.0",
+    "prismjs": "^1.21.0",
     "sirv": "^0.4.0"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 48ceeb1..0496ef0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1306,10 +1306,10 @@ polka@^0.5.0:
     "@polka/url" "^0.5.0"
     trouter "^2.0.1"
 
-prismjs@^1.16.0:
-  version "1.16.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.16.0.tgz#406eb2c8aacb0f5f0f1167930cb83835d10a4308"
-  integrity sha512-OA4MKxjFZHSvZcisLGe14THYsug/nF6O1f0pAJc0KN0wTyAcLqmsbE+lTGKSpyh+9pEW57+k6pg2AfYR+coyHA==
+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"