diff --git a/packages/gatsby-remark-prismjs/package.json b/packages/gatsby-remark-prismjs/package.json
index 298283e0d2db1..13d9482f7ad16 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 654550c4807ec..e6cdd0992f442 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -19028,10 +19028,10 @@ 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:
-  version "1.20.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.20.0.tgz#9b685fc480a3514ee7198eac6a3bf5024319ff03"
-  integrity sha512-AEDjSrVNkynnw6A+B1DsFkd6AVdTnp+/WoUixFRULlCLZVRZlVQMVWio/16jv7G1FscUxQxOQhWwApgbnxr6kQ==
+prismjs@^1.20.0, 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==
   optionalDependencies:
     clipboard "^2.0.0"
 
@@ -24358,7 +24358,7 @@ unified@9.0.0:
     trough "^1.0.0"
     vfile "^4.0.0"
 
-unified@9.1.0, unified@^9.0.0:
+unified@9.1.0:
   version "9.1.0"
   resolved "https://registry.yarnpkg.com/unified/-/unified-9.1.0.tgz#7ba82e5db4740c47a04e688a9ca8335980547410"
   integrity sha512-VXOv7Ic6twsKGJDeZQ2wwPqXs2hM0KNu5Hkg9WgAZbSD1pxhZ7p8swqg583nw1Je2fhwHy6U8aEjiI79x1gvag==
@@ -24416,7 +24416,7 @@ unified@^8.0.0, unified@^8.4.2:
     trough "^1.0.0"
     vfile "^4.0.0"
 
-unified@^9.2.0:
+unified@^9.0.0, unified@^9.2.0:
   version "9.2.0"
   resolved "https://registry.yarnpkg.com/unified/-/unified-9.2.0.tgz#67a62c627c40589edebbf60f53edfd4d822027f8"
   integrity sha512-vx2Z0vY+a3YoTj8+pttM3tiJHCwY5UFbYdiWrwBEbHmK8pvsPj2rtAX2BFfgXen8T39CJWblWRDT4L5WGXtDdg==