diff --git a/package.json b/package.json
index c292557..7c136b5 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "gatsby-transformer-sharp": "^2.5.7",
     "katex": "^0.11.1",
     "lodash": "^4.17.15",
-    "prismjs": "^1.20.0",
+    "prismjs": "^1.21.0",
     "prop-types": "^15.7.2",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
diff --git a/yarn.lock b/yarn.lock
index 9517333..551f3d6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -12194,10 +12194,10 @@ pretty-format@^25.5.0:
     ansi-styles "^4.0.0"
     react-is "^16.12.0"
 
-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==
+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"