diff --git a/packages/protons/package.json b/packages/protons/package.json
index 0e58765..359ec35 100644
--- a/packages/protons/package.json
+++ b/packages/protons/package.json
@@ -154,7 +154,6 @@
   },
   "devDependencies": {
     "aegir": "^36.1.3",
-    "long": "^4.0.0",
     "pbjs": "^0.0.14",
     "protons-runtime": "^1.0.0"
   }
diff --git a/packages/protons/test/index.spec.ts b/packages/protons/test/index.spec.ts
index 2ba943b..d35a24d 100644
--- a/packages/protons/test/index.spec.ts
+++ b/packages/protons/test/index.spec.ts
@@ -6,7 +6,9 @@ import pbjs from 'pbjs'
 import { Basic } from './fixtures/basic.js'
 import { AllTheTypes, AnEnum } from './fixtures/test.js'
 import fs from 'fs'
-import Long from 'long'
+import protobufjs from 'protobufjs'
+
+const Long = protobufjs.util.Long
 
 function longifyBigInts (obj: any) {
   const output = {
@@ -15,6 +17,7 @@ function longifyBigInts (obj: any) {
 
   for (const key of Object.keys(output)) {
     if (typeof output[key] === 'bigint') {
+      // @ts-expect-error exported types are incomplete
       output[key] = Long.fromString(`${output[key].toString()}`)
     }
   }