diff --git a/package.json b/package.json
index dbc584c..28272c2 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "gatsby-source-filesystem": "^1.5.38",
     "gatsby-transformer-remark": "^1.7.41",
     "node-normalize-scss": "^8.0.0",
-    "prismjs": "^1.14.0",
+    "prismjs": "^1.21.0",
     "react-helmet": "^5.2.0",
     "react-simple-social": "^1.0.5"
   },
diff --git a/yarn.lock b/yarn.lock
index 9e899d3..9685c6d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10686,10 +10686,10 @@ pretty-format@^22.4.0, pretty-format@^22.4.3:
     ansi-regex "^3.0.0"
     ansi-styles "^3.2.0"
 
-prismjs@^1.14.0:
-  version "1.20.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.20.0.tgz#9b685fc480a3514ee7198eac6a3bf5024319ff03"
-  integrity sha512-AEDjSrVNkynnw6A+B1DsFkd6AVdTnp+/WoUixFRULlCLZVRZlVQMVWio/16jv7G1FscUxQxOQhWwApgbnxr6kQ==
+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"