diff --git a/.changeset/forty-cameras-peel.md b/.changeset/forty-cameras-peel.md
new file mode 100644
index 00000000..3aa81db2
--- /dev/null
+++ b/.changeset/forty-cameras-peel.md
@@ -0,0 +1,5 @@
+---
+"@primer/gatsby-theme-doctocat": minor
+---
+
+Add syntax highlighting support for `ruby` and `erb` code examples
diff --git a/theme/package.json b/theme/package.json
index ec3e4d22..095aafbe 100644
--- a/theme/package.json
+++ b/theme/package.json
@@ -53,7 +53,8 @@
     "pkg-up": "^3.1.0",
     "pluralize": "^8.0.0",
     "preval.macro": "^3.0.0",
-    "prism-react-renderer": "^0.1.7",
+    "prism-react-renderer": "^1.2.0",
+    "prismjs": "^1.22.0",
     "react-addons-text-content": "^0.0.4",
     "react-element-to-jsx-string": "^14.0.3",
     "react-focus-on": "^3.3.0",
diff --git a/theme/src/components/code.js b/theme/src/components/code.js
index 9155136e..75cbc056 100644
--- a/theme/src/components/code.js
+++ b/theme/src/components/code.js
@@ -1,6 +1,7 @@
-import {Absolute, Box, Relative, Text} from '@primer/components'
-import Highlight, {defaultProps} from 'prism-react-renderer'
-import githubTheme from 'prism-react-renderer/themes/github'
+import { Absolute, Box, Relative, Text } from '@primer/components'
+import Highlight, { defaultProps } from 'prism-react-renderer'
+import Prism from '../prism'
+import githubTheme from '../github'
 import React from 'react'
 import ClipboardCopy from './clipboard-copy'
 import LiveCode from './live-code'
@@ -20,6 +21,7 @@ function Code({className, children, live, noinline}) {
       </Absolute>
       <Highlight
         {...defaultProps}
+        Prism={Prism}
         code={code}
         language={language}
         theme={githubTheme}
diff --git a/theme/src/components/live-code.js b/theme/src/components/live-code.js
index 47b13f6f..40365055 100644
--- a/theme/src/components/live-code.js
+++ b/theme/src/components/live-code.js
@@ -1,6 +1,6 @@
 import {Absolute, BorderBox, Flex, Relative, Text} from '@primer/components'
 import htmlReactParser from 'html-react-parser'
-import githubTheme from 'prism-react-renderer/themes/github'
+import githubTheme from '../github'
 import React, {useState} from 'react'
 import reactElementToJsxString from 'react-element-to-jsx-string'
 import {LiveEditor, LiveError, LivePreview, LiveProvider} from 'react-live'
diff --git a/theme/src/github.js b/theme/src/github.js
new file mode 100644
index 00000000..0b99794a
--- /dev/null
+++ b/theme/src/github.js
@@ -0,0 +1,74 @@
+export default {
+  plain: {
+    color: "#393A34",
+    backgroundColor: "#f6f8fa",
+  },
+  styles: [
+    {
+      types: ["comment", "prolog", "doctype", "cdata"],
+      style: {
+        color: "#999988",
+        fontStyle: "italic",
+      },
+    },
+    {
+      types: ["namespace"],
+      style: {
+        opacity: 0.7,
+      },
+    },
+    {
+      types: ["string", "attr-value"],
+      style: {
+        color: "#e3116c",
+      },
+    },
+    {
+      types: ["punctuation", "operator"],
+      style: {
+        color: "#393A34",
+      },
+    },
+    {
+      types: [
+        "entity",
+        "url",
+        "symbol",
+        "number",
+        "boolean",
+        "variable",
+        "constant",
+        "property",
+        "regex",
+        "inserted",
+      ],
+      style: {
+        color: "#36acaa",
+      },
+    },
+    {
+      types: ["atrule", "keyword", "attr-name", "selector"],
+      style: {
+        color: "#00a4db",
+      },
+    },
+    {
+      types: ["function", "deleted", "tag"],
+      style: {
+        color: "#d73a49",
+      },
+    },
+    {
+      types: ["function-variable"],
+      style: {
+        color: "#6f42c1",
+      },
+    },
+    {
+      types: ["tag", "selector", "keyword"],
+      style: {
+        color: "#00009f",
+      },
+    },
+  ],
+};
diff --git a/theme/src/prism.js b/theme/src/prism.js
new file mode 100644
index 00000000..cdb35199
--- /dev/null
+++ b/theme/src/prism.js
@@ -0,0 +1,27 @@
+import Prism from 'prismjs/components/prism-core'
+
+// Core languages
+import 'prismjs/components/prism-clike';
+import 'prismjs/components/prism-markup';
+import 'prismjs/components/prism-markup-templating';
+
+// Supported languages
+import 'prismjs/components/prism-bash';
+import 'prismjs/components/prism-css';
+import 'prismjs/components/prism-diff';
+import 'prismjs/components/prism-go';
+import 'prismjs/components/prism-json';
+import 'prismjs/components/prism-markdown';
+import 'prismjs/components/prism-yaml';
+
+// JS like
+import 'prismjs/components/prism-javascript';
+import 'prismjs/components/prism-jsx';
+import 'prismjs/components/prism-typescript';
+import 'prismjs/components/prism-tsx';
+
+// Ruby like
+import 'prismjs/components/prism-ruby';
+import 'prismjs/components/prism-erb';
+
+export default Prism
diff --git a/yarn.lock b/yarn.lock
index 0a69c445..37e26635 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4423,6 +4423,15 @@ cli-width@^3.0.0:
   resolved "https://registry.yarnpkg.com/cli-width/-/cli-width-3.0.0.tgz#a2f48437a2caa9a22436e794bf071ec9e61cedf6"
   integrity sha512-FxqpkPPwu1HjuN93Omfm4h8uIanXofW0RxVEW3k5RKx+mJJYSthzNhp32Kzxxy3YAEZ/Dc/EWN1vZRY0+kOhbw==
 
+clipboard@^2.0.0:
+  version "2.0.6"
+  resolved "https://registry.yarnpkg.com/clipboard/-/clipboard-2.0.6.tgz#52921296eec0fdf77ead1749421b21c968647376"
+  integrity sha512-g5zbiixBRk/wyKakSwCKd7vQXDjFnAMGHoEyBogG/bw9kTD9GvdAvaoRR1ALcEzt3pVKxZR0pViekPMIS0QyGg==
+  dependencies:
+    good-listener "^1.2.2"
+    select "^1.1.2"
+    tiny-emitter "^2.0.0"
+
 clipboardy@^2.3.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/clipboardy/-/clipboardy-2.3.0.tgz#3c2903650c68e46a91b388985bc2774287dba290"
@@ -5468,6 +5477,11 @@ delayed-stream@~1.0.0:
   resolved "https://registry.yarnpkg.com/delayed-stream/-/delayed-stream-1.0.0.tgz#df3ae199acadfb7d440aaae0b29e2272b24ec619"
   integrity sha1-3zrhmayt+31ECqrgsp4icrJOxhk=
 
+delegate@^3.1.2:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/delegate/-/delegate-3.2.0.tgz#b66b71c3158522e8ab5744f720d8ca0c2af59166"
+  integrity sha512-IofjkYBZaZivn0V8nnsMJGBr4jVLxHDheKSW88PyxS5QC4Vo9ZbZVvhzlSxY87fVq3STR6r+4cGepyHkcWOQSw==
+
 delegates@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/delegates/-/delegates-1.0.0.tgz#84c6e159b81904fdca59a0ef44cd870d31250f9a"
@@ -7763,6 +7777,13 @@ globule@^1.0.0:
     lodash "~4.17.10"
     minimatch "~3.0.2"
 
+good-listener@^1.2.2:
+  version "1.2.2"
+  resolved "https://registry.yarnpkg.com/good-listener/-/good-listener-1.2.2.tgz#d53b30cdf9313dffb7dc9a0d477096aa6d145c50"
+  integrity sha1-1TswzfkxPf+33JoNR3CWqm0UXFA=
+  dependencies:
+    delegate "^3.1.2"
+
 got@8.3.2:
   version "8.3.2"
   resolved "https://registry.yarnpkg.com/got/-/got-8.3.2.tgz#1d23f64390e97f776cac52e5b936e5f514d2e937"
@@ -12466,16 +12487,23 @@ preval.macro@^3.0.0:
   dependencies:
     babel-plugin-preval "^3.0.0"
 
-prism-react-renderer@^0.1.7:
-  version "0.1.7"
-  resolved "https://registry.yarnpkg.com/prism-react-renderer/-/prism-react-renderer-0.1.7.tgz#dc273d0cb6e4a498ba0775094e9a8b01a3ad2eaa"
-  integrity sha512-EhnM0sYfLK103ASK0ViSv0rta//ZGB0dBA9TiFyOvA+zOj5peLmGEG01sLEDwl9sMe+gSqncInafBe1VFTCMvA==
-
 prism-react-renderer@^1.0.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/prism-react-renderer/-/prism-react-renderer-1.1.1.tgz#1c1be61b1eb9446a146ca7a50b7bcf36f2a70a44"
   integrity sha512-MgMhSdHuHymNRqD6KM3eGS0PNqgK9q4QF5P0yoQQvpB6jNjeSAi3jcSAz0Sua/t9fa4xDOMar9HJbLa08gl9ug==
 
+prism-react-renderer@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/prism-react-renderer/-/prism-react-renderer-1.2.0.tgz#5ad4f90c3e447069426c8a53a0eafde60909cdf4"
+  integrity sha512-GHqzxLYImx1iKN1jJURcuRoA/0ygCcNhfGw1IT8nPIMzarmKQ3Nc+JcG0gi8JXQzuh0C5ShE4npMIoqNin40hg==
+
+prismjs@^1.22.0:
+  version "1.22.0"
+  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.22.0.tgz#73c3400afc58a823dd7eed023f8e1ce9fd8977fa"
+  integrity sha512-lLJ/Wt9yy0AiSYBf212kK3mM5L8ycwlyTlSxHBAneXLR0nzFMlZ5y7riFPF3E33zXOF2IH95xdY5jIyZbM9z/w==
+  optionalDependencies:
+    clipboard "^2.0.0"
+
 process-nextick-args@~2.0.0:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-2.0.1.tgz#7820d9b16120cc55ca9ae7792680ae7dba6d7fe2"
@@ -13913,6 +13941,11 @@ select-hose@^2.0.0:
   resolved "https://registry.yarnpkg.com/select-hose/-/select-hose-2.0.0.tgz#625d8658f865af43ec962bfc376a37359a4994ca"
   integrity sha1-Yl2GWPhlr0Psliv8N2o3NZpJlMo=
 
+select@^1.1.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/select/-/select-1.1.2.tgz#0e7350acdec80b1108528786ec1d4418d11b396d"
+  integrity sha1-DnNQrN7ICxEIUoeG7B1EGNEbOW0=
+
 selfsigned@^1.10.7:
   version "1.10.7"
   resolved "https://registry.yarnpkg.com/selfsigned/-/selfsigned-1.10.7.tgz#da5819fd049d5574f28e88a9bcc6dbc6e6f3906b"
@@ -15243,6 +15276,11 @@ timsort@^0.3.0:
   resolved "https://registry.yarnpkg.com/timsort/-/timsort-0.3.0.tgz#405411a8e7e6339fe64db9a234de11dc31e02bd4"
   integrity sha1-QFQRqOfmM5/mTbmiNN4R3DHgK9Q=
 
+tiny-emitter@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/tiny-emitter/-/tiny-emitter-2.1.0.tgz#1d1a56edfc51c43e863cbb5382a72330e3555423"
+  integrity sha512-NB6Dk1A9xgQPMoGqC5CVXn123gWyte215ONT5Pp5a0yt4nlEoO1ZWeCwpncaekPHXO60i47ihFnZPiRPjRMq4Q==
+
 tiny-warning@^1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/tiny-warning/-/tiny-warning-1.0.3.tgz#94a30db453df4c643d0fd566060d60a875d84754"