diff --git a/package.json b/package.json
index 2bd2c40..d20afb1 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "clean": "rimraf build/*",
     "postversion": "yarn postversion:check && yarn postversion:commit && yarn postversion:push",
     "postversion:check": "yarn lint && yarn test",
-    "postversion:commit": "VERSION=v$npm_package_version && node scripts/postversion-commit.js",
+    "postversion:commit": "node scripts/postversion-commit.js",
     "postversion:push": "git push && git push --tags",
     "prepublish": "yarn lint && yarn test",
     "prepack": "yarn clean && yarn build"
diff --git a/scripts/postversion-commit.js b/scripts/postversion-commit.js
index 2482221..7a1d0f0 100644
--- a/scripts/postversion-commit.js
+++ b/scripts/postversion-commit.js
@@ -1,19 +1,11 @@
 import {execSync} from 'node:child_process';
-import assert from 'node:assert/strict';
+import {version} from '../package.json';
 
 /**
  * Utility for committing and tagging a release commit in
  * git, called as part of the `yarn postversion` script.
  */
 
-const version = process.env.VERSION;
-
-assert.match(
-  version,
-  /^v\d+\.\d+\.\d+[a-zA-Z0-9\._-]*$/,
-  'Missing or invalid process.env.VERSION'
-);
-
 const currentBranch = execSync('git rev-parse --abbrev-ref HEAD')
   .toString()
   .trim();