diff --git a/packages/gatsby-remark-prismjs/package.json b/packages/gatsby-remark-prismjs/package.json
index 2affae152126c..bd58adec3d6c5 100644
--- a/packages/gatsby-remark-prismjs/package.json
+++ b/packages/gatsby-remark-prismjs/package.json
@@ -17,7 +17,7 @@
     "babel-preset-gatsby-package": "^0.5.3",
     "cheerio": "^1.0.0-rc.3",
     "cross-env": "^7.0.2",
-    "prismjs": "^1.20.0",
+    "prismjs": "^1.21.0",
     "remark": "^9.0.0"
   },
   "peerDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 53fd4d4bfeede..7d6c819f7f4a6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -19018,7 +19018,7 @@ prism-react-renderer@^1.1.1:
   resolved "https://registry.yarnpkg.com/prism-react-renderer/-/prism-react-renderer-1.1.1.tgz#1c1be61b1eb9446a146ca7a50b7bcf36f2a70a44"
   integrity sha512-MgMhSdHuHymNRqD6KM3eGS0PNqgK9q4QF5P0yoQQvpB6jNjeSAi3jcSAz0Sua/t9fa4xDOMar9HJbLa08gl9ug==
 
-prismjs@^1.20.0, prismjs@^1.21.0:
+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==