diff --git a/GureumTests/GureumTests.swift b/GureumTests/GureumTests.swift
index 151e8ebf..5b732451 100644
--- a/GureumTests/GureumTests.swift
+++ b/GureumTests/GureumTests.swift
@@ -68,7 +68,7 @@ class GureumTests: XCTestCase {
             XCTFail()
             return
         }
-        let versionInfo = UpdateManager.VersionInfo(data: versionInfoJSON)
+        let versionInfo = UpdateManager.VersionInfo(data: versionInfoJSON, experimental: true)
         UpdateManager.shared.notifyUpdate(info: versionInfo)
         XCTAssertEqual("최신 버전: 1.10.0 현재 버전: \(UpdateManager.bundleVersion ?? "-")\nMojave 대응을 포함한 대형 업데이트", lastNotification.informativeText)
         XCTAssertEqual(["url": "https://github.com/gureum/gureum/releases/tag/1.10.0"], lastNotification.userInfo as! [String: String])
diff --git a/GureumTests/MockInputClient.m b/GureumTests/MockInputClient.m
index cd615766..0e9151fd 100644
--- a/GureumTests/MockInputClient.m
+++ b/GureumTests/MockInputClient.m
@@ -27,6 +27,7 @@ - (NSString *)selectedString {
 }
 
 - (void)insertText:(id)string replacementRange:(NSRange)replacementRange {
+    // NSAssert(replacementRange.location == NSNotFound || replacementRange.length != 0, @"-");
     [super insertText:string replacementRange:replacementRange];
 }
 
diff --git a/OSX/UpdateManager.swift b/OSX/UpdateManager.swift
index 09fb0cf8..ea3875d9 100644
--- a/OSX/UpdateManager.swift
+++ b/OSX/UpdateManager.swift
@@ -16,8 +16,10 @@ class UpdateManager {
     class VersionInfo {
         let current: String? = UpdateManager.bundleVersion
         let data: [String: String]
-        init(data: [String: String]) {
+        let experimental: Bool
+        init(data: [String: String], experimental: Bool) {
             self.data = data
+            self.experimental = experimental
         }
 
         var recent: String? {
@@ -36,7 +38,7 @@ class UpdateManager {
         }
     }
 
-    func fetchVersionInfo(from url: URL) -> VersionInfo? {
+    func fetchVersionInfo(from url: URL, experimental: Bool) -> VersionInfo? {
         var request = URLRequest(url: url)
         request.timeoutInterval = 0.5
         request.cachePolicy = .reloadIgnoringCacheData
@@ -49,17 +51,17 @@ class UpdateManager {
         guard let info = try? JSONSerialization.jsonObject(with: data as Data) as? [String: String] else {
             return nil
         }
-        return VersionInfo(data: info)
+        return VersionInfo(data: info, experimental: experimental)
     }
 
     func fetchOfficialVersionInfo() -> VersionInfo? {
         let url = URL(string: "http://gureum.io/version.json")!
-        return fetchVersionInfo(from: url)
+        return fetchVersionInfo(from: url, experimental: false)
     }
 
     func fetchExperimentalVersionInfo() -> VersionInfo? {
         let url = URL(string: "http://gureum.io/version-experimental.json")!
-        return fetchVersionInfo(from: url)
+        return fetchVersionInfo(from: url, experimental: true)
     }
 
     func fetchAutoUpdateVersionInfo() -> VersionInfo? {
@@ -75,7 +77,11 @@ class UpdateManager {
 
     func notifyUpdate(info: VersionInfo) {
         let notification = NSUserNotification()
-        notification.title = "구름 입력기 업데이트 알림"
+        var title = "구름 입력기 업데이트 알림"
+        if info.experimental {
+            title += " (실험 버전)"
+        }
+        notification.title = title
         notification.hasActionButton = true
         notification.hasReplyButton = false
         notification.actionButtonTitle = "업데이트"