diff --git a/package.json b/package.json
index efc1b8b..fabdf4b 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
     "jest": "^20.0.4",
     "normalize.css": "7.0.0",
     "preact": "8.5.2",
-    "prismjs": "1.18.0",
+    "prismjs": "1.20.0",
     "style-loader": "0.18.2",
     "webpack": "3.4.1"
   },
diff --git a/yarn.lock b/yarn.lock
index 2b68114..ece69a1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3543,10 +3543,10 @@ pretty-format@^20.0.3:
     ansi-regex "^2.1.1"
     ansi-styles "^3.0.0"
 
-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==
+prismjs@1.20.0:
+  version "1.20.0"
+  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.20.0.tgz#9b685fc480a3514ee7198eac6a3bf5024319ff03"
+  integrity sha512-AEDjSrVNkynnw6A+B1DsFkd6AVdTnp+/WoUixFRULlCLZVRZlVQMVWio/16jv7G1FscUxQxOQhWwApgbnxr6kQ==
   optionalDependencies:
     clipboard "^2.0.0"