diff --git a/scripts/check-release.mjs b/scripts/check-release.mjs
index 156897b4..cd41562d 100644
--- a/scripts/check-release.mjs
+++ b/scripts/check-release.mjs
@@ -1,42 +1,12 @@
 import { readFile } from "node:fs/promises";
 import path from "node:path";
+import { compareVersions, isExpectedNextVersion, parseVersion, readJson } from "./release-utils.mjs";
 
 function fail(message) {
   console.error(`release check failed: ${message}`);
   process.exitCode = 1;
 }
 
-async function readJson(file) {
-  return JSON.parse(await readFile(file, "utf8"));
-}
-
-function parseVersion(version) {
-  const match = /^(\d+)\.(\d+)\.(\d+)$/.exec(version);
-  if (!match) return null;
-  return {
-    major: Number(match[1]),
-    minor: Number(match[2]),
-    patch: Number(match[3]),
-  };
-}
-
-function compareVersions(a, b) {
-  return a.major - b.major || a.minor - b.minor || a.patch - b.patch;
-}
-
-function isExpectedNextVersion(previous, current) {
-  if (current.major === previous.major && current.minor === previous.minor) {
-    return current.patch === previous.patch + 1;
-  }
-  if (current.major === previous.major && current.minor === previous.minor + 1) {
-    return current.patch === 0;
-  }
-  if (current.major === previous.major + 1) {
-    return current.minor === 0 && current.patch === 0;
-  }
-  return false;
-}
-
 const packageJson = await readJson("package.json");
 const packageLockJson = await readJson("package-lock.json");
 const manifestJson = await readJson("manifest.json");
diff --git a/scripts/prepare-release.mjs b/scripts/prepare-release.mjs
index edf48d9e..cec2c590 100644
--- a/scripts/prepare-release.mjs
+++ b/scripts/prepare-release.mjs
@@ -1,46 +1,12 @@
 import { mkdir, readFile, writeFile } from "node:fs/promises";
 import path from "node:path";
+import { compareVersions, isExpectedNextVersion, parseVersion, readJson, writeJson } from "./release-utils.mjs";
 
 function fail(message) {
   console.error(`release prepare failed: ${message}`);
   process.exit(1);
 }
 
-async function readJson(file) {
-  return JSON.parse(await readFile(file, "utf8"));
-}
-
-async function writeJson(file, value) {
-  await writeFile(file, `${JSON.stringify(value, null, 2)}\n`);
-}
-
-function parseVersion(version) {
-  const match = /^(\d+)\.(\d+)\.(\d+)$/.exec(version);
-  if (!match) return null;
-  return {
-    major: Number(match[1]),
-    minor: Number(match[2]),
-    patch: Number(match[3]),
-  };
-}
-
-function compareVersions(a, b) {
-  return a.major - b.major || a.minor - b.minor || a.patch - b.patch;
-}
-
-function isExpectedNextVersion(previous, current) {
-  if (current.major === previous.major && current.minor === previous.minor) {
-    return current.patch === previous.patch + 1;
-  }
-  if (current.major === previous.major && current.minor === previous.minor + 1) {
-    return current.patch === 0;
-  }
-  if (current.major === previous.major + 1) {
-    return current.minor === 0 && current.patch === 0;
-  }
-  return false;
-}
-
 const releaseVersion = process.argv[2];
 if (!releaseVersion) fail("usage: npm run release:prepare -- X.Y.Z");
 
diff --git a/scripts/release-utils.mjs b/scripts/release-utils.mjs
new file mode 100644
index 00000000..bc9402ec
--- /dev/null
+++ b/scripts/release-utils.mjs
@@ -0,0 +1,36 @@
+import { readFile, writeFile } from "node:fs/promises";
+
+export async function readJson(file) {
+  return JSON.parse(await readFile(file, "utf8"));
+}
+
+export async function writeJson(file, value) {
+  await writeFile(file, `${JSON.stringify(value, null, 2)}\n`);
+}
+
+export function parseVersion(version) {
+  const match = /^(\d+)\.(\d+)\.(\d+)$/.exec(version);
+  if (!match) return null;
+  return {
+    major: Number(match[1]),
+    minor: Number(match[2]),
+    patch: Number(match[3]),
+  };
+}
+
+export function compareVersions(a, b) {
+  return a.major - b.major || a.minor - b.minor || a.patch - b.patch;
+}
+
+export function isExpectedNextVersion(previous, current) {
+  if (current.major === previous.major && current.minor === previous.minor) {
+    return current.patch === previous.patch + 1;
+  }
+  if (current.major === previous.major && current.minor === previous.minor + 1) {
+    return current.patch === 0;
+  }
+  if (current.major === previous.major + 1) {
+    return current.minor === 0 && current.patch === 0;
+  }
+  return false;
+}