diff --git a/version-bump.mjs b/version-bump.mjs
index d409fa0..55d631f 100644
--- a/version-bump.mjs
+++ b/version-bump.mjs
@@ -3,12 +3,15 @@ import { readFileSync, writeFileSync } from "fs";
 const targetVersion = process.env.npm_package_version;
 
 // read minAppVersion from manifest.json and bump version to target version
-let manifest = JSON.parse(readFileSync("manifest.json", "utf8"));
+const manifest = JSON.parse(readFileSync("manifest.json", "utf8"));
 const { minAppVersion } = manifest;
 manifest.version = targetVersion;
 writeFileSync("manifest.json", JSON.stringify(manifest, null, "\t"));
 
 // update versions.json with target version and minAppVersion from manifest.json
-let versions = JSON.parse(readFileSync("versions.json", "utf8"));
-versions[targetVersion] = minAppVersion;
-writeFileSync("versions.json", JSON.stringify(versions, null, "\t"));
+// but only if the target version is not already in versions.json
+const versions = JSON.parse(readFileSync('versions.json', 'utf8'));
+if (!Object.values(versions).includes(minAppVersion)) {
+    versions[targetVersion] = minAppVersion;
+    writeFileSync('versions.json', JSON.stringify(versions, null, '\t'));
+}