diff --git a/package-lock.json b/package-lock.json
index 06db39e1edc7..f91cf97fbc57 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
         "@alex_neo/jest-expect-message": "^1.0.5",
         "@hapi/accept": "^5.0.2",
         "@primer/components": "^31.1.0",
-        "@primer/css": "^18.1.0",
+        "@primer/css": "^20.5.1",
         "@primer/octicons": "^16.1.1",
         "@primer/octicons-react": "^16.1.1",
         "accept-language-parser": "^1.5.0",
@@ -3543,20 +3543,20 @@
       }
     },
     "node_modules/@primer/css": {
-      "version": "18.1.0",
-      "resolved": "https://registry.npmjs.org/@primer/css/-/css-18.1.0.tgz",
-      "integrity": "sha512-B7ZjxeGPXzcaSm7dAp9n1C2tXDfJnRpdUlfLoTnsXWGKKgbHKgtDtwgRn+e0KGSDoNTmC85N3gemNfkT69D0kg==",
+      "version": "20.5.1",
+      "resolved": "https://registry.npmjs.org/@primer/css/-/css-20.5.1.tgz",
+      "integrity": "sha512-kMjlYzXqE0k6xIKC0BCZEDlngYZUcvbTgDWqUVbOk9IM19EYTMgHxME5i8wHpVGH22fQb8jnMbShdIq03uCWJw==",
       "dependencies": {
-        "@primer/primitives": "6.0.0"
+        "@primer/primitives": "^7.9.0"
       },
       "engines": {
         "node": "^12.20.0 || ^14.13.1 || >=16.0.0"
       }
     },
     "node_modules/@primer/css/node_modules/@primer/primitives": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/@primer/primitives/-/primitives-6.0.0.tgz",
-      "integrity": "sha512-idupwQC7vpMki4G2HBpQqTAD6MusFkipgfNXxETQ1D4yLkMQ1bMuif09dnHB7bhQBO5pXUFt52LMpPAnM5Zv4w=="
+      "version": "7.10.0",
+      "resolved": "https://registry.npmjs.org/@primer/primitives/-/primitives-7.10.0.tgz",
+      "integrity": "sha512-DdLHq21e93R9qDHyRuRpytBLY0Up9IwNWMOUgPNW6lRSng4N4+IdUlLS3Ekbasmxfs8Z8vKS8aezeYovQ5qsxQ=="
     },
     "node_modules/@primer/octicons": {
       "version": "16.1.1",
@@ -18479,6 +18479,14 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/rehype-highlight/node_modules/highlight.js": {
+      "version": "11.3.1",
+      "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-11.3.1.tgz",
+      "integrity": "sha512-PUhCRnPjLtiLHZAQ5A/Dt5F8cWZeMyj9KRsACsWT+OD6OP0x6dp5OmT5jdx0JgEyPxPZZIPQpRN2TciUT7occw==",
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    },
     "node_modules/rehype-highlight/node_modules/lowlight": {
       "version": "2.4.0",
       "resolved": "https://registry.npmjs.org/lowlight/-/lowlight-2.4.0.tgz",
@@ -25514,17 +25522,17 @@
       }
     },
     "@primer/css": {
-      "version": "18.1.0",
-      "resolved": "https://registry.npmjs.org/@primer/css/-/css-18.1.0.tgz",
-      "integrity": "sha512-B7ZjxeGPXzcaSm7dAp9n1C2tXDfJnRpdUlfLoTnsXWGKKgbHKgtDtwgRn+e0KGSDoNTmC85N3gemNfkT69D0kg==",
+      "version": "20.5.1",
+      "resolved": "https://registry.npmjs.org/@primer/css/-/css-20.5.1.tgz",
+      "integrity": "sha512-kMjlYzXqE0k6xIKC0BCZEDlngYZUcvbTgDWqUVbOk9IM19EYTMgHxME5i8wHpVGH22fQb8jnMbShdIq03uCWJw==",
       "requires": {
-        "@primer/primitives": "6.0.0"
+        "@primer/primitives": "^7.9.0"
       },
       "dependencies": {
         "@primer/primitives": {
-          "version": "6.0.0",
-          "resolved": "https://registry.npmjs.org/@primer/primitives/-/primitives-6.0.0.tgz",
-          "integrity": "sha512-idupwQC7vpMki4G2HBpQqTAD6MusFkipgfNXxETQ1D4yLkMQ1bMuif09dnHB7bhQBO5pXUFt52LMpPAnM5Zv4w=="
+          "version": "7.10.0",
+          "resolved": "https://registry.npmjs.org/@primer/primitives/-/primitives-7.10.0.tgz",
+          "integrity": "sha512-DdLHq21e93R9qDHyRuRpytBLY0Up9IwNWMOUgPNW6lRSng4N4+IdUlLS3Ekbasmxfs8Z8vKS8aezeYovQ5qsxQ=="
         }
       }
     },
@@ -37229,6 +37237,11 @@
             "format": "^0.2.0"
           }
         },
+        "highlight.js": {
+          "version": "11.3.1",
+          "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-11.3.1.tgz",
+          "integrity": "sha512-PUhCRnPjLtiLHZAQ5A/Dt5F8cWZeMyj9KRsACsWT+OD6OP0x6dp5OmT5jdx0JgEyPxPZZIPQpRN2TciUT7occw=="
+        },
         "lowlight": {
           "version": "2.4.0",
           "resolved": "https://registry.npmjs.org/lowlight/-/lowlight-2.4.0.tgz",
diff --git a/package.json b/package.json
index b7e9bfdabe73..813f1a789916 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "@alex_neo/jest-expect-message": "^1.0.5",
     "@hapi/accept": "^5.0.2",
     "@primer/components": "^31.1.0",
-    "@primer/css": "^18.1.0",
+    "@primer/css": "^20.5.1",
     "@primer/octicons": "^16.1.1",
     "@primer/octicons-react": "^16.1.1",
     "accept-language-parser": "^1.5.0",