diff --git a/packs/code-surfer/package.json b/packs/code-surfer/package.json
index c6feb8ca..e487ad8d 100644
--- a/packs/code-surfer/package.json
+++ b/packs/code-surfer/package.json
@@ -30,7 +30,7 @@
     "@types/theme-ui": "^0.2.0",
     "array.prototype.flat": "^1.2.1",
     "diff": "^4.0.1",
-    "prismjs": "^1.16.0",
+    "prismjs": "^1.21.0",
     "rebound": "^0.1.0",
     "shell-quote": "^1.6.1",
     "use-spring": "^0.2.2"
diff --git a/packs/standalone/package.json b/packs/standalone/package.json
index 42e0f1f6..a9e14e25 100644
--- a/packs/standalone/package.json
+++ b/packs/standalone/package.json
@@ -32,7 +32,7 @@
     "@types/theme-ui": "^0.2.2",
     "array.prototype.flat": "^1.2.1",
     "diff": "^4.0.1",
-    "prismjs": "^1.16.0",
+    "prismjs": "^1.21.0",
     "rebound": "^0.1.0",
     "shell-quote": "^1.6.1"
   },
diff --git a/packs/step-parser/package.json b/packs/step-parser/package.json
index ce2cf2db..33f878a6 100644
--- a/packs/step-parser/package.json
+++ b/packs/step-parser/package.json
@@ -24,7 +24,7 @@
   "dependencies": {
     "array.prototype.flat": "^1.2.1",
     "diff": "^4.0.1",
-    "prismjs": "^1.16.0",
+    "prismjs": "^1.21.0",
     "shell-quote": "^1.6.1"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index de60c83f..7f14d17b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -12015,7 +12015,14 @@ prism-react-renderer@^1.0.2:
   resolved "https://registry.yarnpkg.com/prism-react-renderer/-/prism-react-renderer-1.0.2.tgz#3bb9a6a42f76fc049b03266298c7068fdd4b7ea9"
   integrity sha512-0++pJyRfu4v2OxI/Us/5RLui9ESDkTiLkVCtKuPZYdpB8UQWJpnJQhPrWab053XtsKW3oM0sD69uJ6N9exm1Ag==
 
-prismjs@^1.16.0, prismjs@^1.8.4, prismjs@~1.17.0:
+prismjs@^1.21.0, prismjs@^1.8.4:
+  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"
+
+prismjs@~1.17.0:
   version "1.17.1"
   resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.17.1.tgz#e669fcbd4cdd873c35102881c33b14d0d68519be"
   integrity sha512-PrEDJAFdUGbOP6xK/UsfkC5ghJsPJviKgnQOoxaDbBjwc8op68Quupwt1DeAFoG8GImPhiKXAvvsH7wDSLsu1Q==