diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 74d142cd..dc3147bf 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -17,6 +17,10 @@ jobs:
     #  TURBO_TEAM: ${{ vars.TURBO_TEAM }}
     #  TURBO_REMOTE_ONLY: true
 
+    strategy:
+      matrix:
+        node-version: ['18.x', '20.x', '22.x']
+
     steps:
       - name: Check out code
         uses: actions/checkout@v4
@@ -27,10 +31,10 @@ jobs:
         with:
           version: 9
 
-      - name: Setup Node.js environment
+      - name: Setup Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version: ${{ matrix.node-version }}
           cache: 'pnpm'
 
       - name: Install dependencies
diff --git a/README.md b/README.md
index fab42f05..eba252fa 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ Srcbook runs locally on your machine as a CLI application with a web interface.
 
 ### Requirements
 
-- Node 20+, we recommend using [nvm](https://github.com/nvm-sh/nvm) to manage local node versions
+- Node 18+, we recommend using [nvm](https://github.com/nvm-sh/nvm) to manage local node versions
 - [corepack](https://nodejs.org/api/corepack.html) to manage package manager versions
 
 ### Installing
diff --git a/package.json b/package.json
index e4c61c17..7ba95c46 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,6 @@
   },
   "packageManager": "pnpm@9.8.0",
   "engines": {
-    "node": ">=20"
+    "node": ">=18"
   }
 }
diff --git a/packages/shared/src/utils.ts b/packages/shared/src/utils.ts
index 0e7a9754..1183010e 100644
--- a/packages/shared/src/utils.ts
+++ b/packages/shared/src/utils.ts
@@ -1,8 +1,15 @@
 import { base32hexnopad } from '@scure/base';
 import type { CodeLanguageType } from './types/cells.js';
+import * as crypto from 'crypto';
+
+export function isBrowser(): boolean {
+  return typeof window !== 'undefined';
+}
 
 export function randomid(byteSize = 16) {
-  const bytes = crypto.getRandomValues(new Uint8Array(byteSize));
+  const bytes = isBrowser()
+    ? globalThis.crypto.getRandomValues(new Uint8Array(byteSize))
+    : crypto.getRandomValues(new Uint8Array(byteSize));
   return base32hexnopad.encode(bytes).toLowerCase();
 }
 
diff --git a/srcbook/README.md b/srcbook/README.md
index ff401b65..56aa2a5a 100644
--- a/srcbook/README.md
+++ b/srcbook/README.md
@@ -24,7 +24,7 @@ Srcbook runs locally on your machine as a CLI application with a web interface.
 
 ### Requirements
 
-- Node.js v20+
+- Node.js v18+
 - We recommend using [nvm](https://github.com/nvm-sh/nvm) to manage local node versions
 
 ### Installing
diff --git a/srcbook/package.json b/srcbook/package.json
index 9efbe9af..8c9fbaf9 100644
--- a/srcbook/package.json
+++ b/srcbook/package.json
@@ -34,6 +34,6 @@
     "@types/express": "^4.17.21"
   },
   "engines": {
-    "node": ">=20"
+    "node": ">=18"
   }
 }