diff --git a/src/plugins/min-host-version.test.ts b/src/plugins/min-host-version.test.ts
index bdede68881b..2df69bbade2 100644
--- a/src/plugins/min-host-version.test.ts
+++ b/src/plugins/min-host-version.test.ts
@@ -62,6 +62,10 @@ describe("min-host-version", () => {
   it("parses semver floors", () => {
     expect(parseMinHostVersionRequirement(">=2026.3.22")).toEqual(MIN_HOST_REQUIREMENT);
     expect(parseMinHostVersionRequirement(">=2026.5.1-beta.1")).toEqual(BETA_MIN_HOST_REQUIREMENT);
+    expect(parseMinHostVersionRequirement(">=2026.5.1+20260501")).toEqual({
+      raw: ">=2026.5.1+20260501",
+      minimumLabel: "2026.5.1+20260501",
+    });
   });
 
   it("can parse legacy bare semver floors for runtime upgrade compatibility", () => {
diff --git a/src/plugins/min-host-version.ts b/src/plugins/min-host-version.ts
index 255367eaf5e..29155c3330d 100644
--- a/src/plugins/min-host-version.ts
+++ b/src/plugins/min-host-version.ts
@@ -1,8 +1,9 @@
 import { isAtLeast, parseSemver } from "../infra/runtime-guard.js";
 
 export const MIN_HOST_VERSION_FORMAT =
-  'openclaw.install.minHostVersion must use a semver floor in the form ">=x.y.z" or ">=x.y.z-prerelease"';
-const MIN_HOST_VERSION_RE = /^>=(\d+)\.(\d+)\.(\d+)(-[0-9A-Za-z.-]+)?$/;
+  'openclaw.install.minHostVersion must use a semver floor in the form ">=x.y.z[-prerelease][+build]"';
+const SEMVER_LABEL_RE = String.raw`\d+\.\d+\.\d+(?:-[0-9A-Za-z.-]+)?(?:\+[0-9A-Za-z.-]+)?`;
+const MIN_HOST_VERSION_RE = new RegExp(`^>=(${SEMVER_LABEL_RE})$`);
 const LEGACY_MIN_HOST_VERSION_RE = /^(\d+)\.(\d+)\.(\d+)$/;
 
 export type MinHostVersionRequirement = {
@@ -40,7 +41,7 @@ export function parseMinHostVersionRequirement(
   if (!match) {
     return null;
   }
-  const minimumLabel = `${match[1]}.${match[2]}.${match[3]}${match[4] ?? ""}`;
+  const minimumLabel = match.length >= 4 ? `${match[1]}.${match[2]}.${match[3]}` : (match[1] ?? "");
   if (!parseSemver(minimumLabel)) {
     return null;
   }
diff --git a/test/release-check.test.ts b/test/release-check.test.ts
index 1838002e1cf..652d5ac2c93 100644
--- a/test/release-check.test.ts
+++ b/test/release-check.test.ts
@@ -211,7 +211,7 @@ describe("collectBundledExtensionManifestErrors", () => {
         },
       ]),
     ).toEqual([
-      "bundled extension 'broken' manifest invalid | openclaw.install.minHostVersion must use a semver floor in the form \">=x.y.z\"",
+      "bundled extension 'broken' manifest invalid | openclaw.install.minHostVersion must use a semver floor in the form \">=x.y.z[-prerelease][+build]\"",
     ]);
   });