diff --git a/package.json b/package.json
index 93e66067c7..f0970db5a4 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,9 @@
     "./dist/liquid.node.esm.js": "./dist/liquid.browser.esm.js"
   },
   "types": "dist/liquid.d.ts",
+  "engines": {
+    "node": ">=14"
+  },
   "scripts": {
     "lint": "eslint \"**/*.mjs\" \"**/*.ts\" .",
     "check": "npm run build && npm test && npm run lint && npm run perf:diff",
diff --git a/rollup.config.mjs b/rollup.config.mjs
index bb30ac2609..a382accb0b 100644
--- a/rollup.config.mjs
+++ b/rollup.config.mjs
@@ -61,8 +61,8 @@ const nodeCjs = {
     format: 'cjs',
     banner
   }],
-  external: ['path', 'fs'],
-  plugins: [versionInjection, typescript(tsconfig('es5'))],
+  external: ['path', 'fs', 'stream'],
+  plugins: [versionInjection, typescript(tsconfig('ES2020'))],
   treeshake,
   input
 }
@@ -73,7 +73,7 @@ const nodeEsm = {
     format: 'esm',
     banner
   }],
-  external: ['path', 'fs'],
+  external: ['path', 'fs', 'stream'],
   plugins: [
     versionInjection,
     replace(esmRequire),
diff --git a/src/liquid-options.ts b/src/liquid-options.ts
index 1be99d6b42..a45ca5ec27 100644
--- a/src/liquid-options.ts
+++ b/src/liquid-options.ts
@@ -5,7 +5,7 @@ import { FS } from './fs/fs'
 import * as fs from './fs/node'
 import { defaultOperators, Operators } from './render/operator'
 import { filters } from './filters'
-import { assert } from './types'
+import { assert } from './util/assert'
 
 type OutputEscape = (value: any) => string
 type OutputEscapeOption = 'escape' | 'json' | OutputEscape