diff --git a/Sources/Kapture/App.swift b/Sources/Kapture/App.swift
index c336588..cac7aed 100644
--- a/Sources/Kapture/App.swift
+++ b/Sources/Kapture/App.swift
@@ -21,6 +21,17 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
             runOCRSelfTest()
             return
         }
+        // Single instance: stale copies keep their own hotkey + overlays alive
+        // after app updates and eat clicks meant for the new instance.
+        let myPid = ProcessInfo.processInfo.processIdentifier
+        let others = NSRunningApplication.runningApplications(withBundleIdentifier: "dev.tzgyn.kapture")
+            .filter { $0.processIdentifier != myPid }
+        if !others.isEmpty {
+            CaptureController.log("launch: other Kapture instances pids=\(others.map { String($0.processIdentifier) }.joined(separator: ",")) — terminating them")
+            for other in others {
+                other.forceTerminate()
+            }
+        }
         HotkeyManager.shared.onTrigger = { CaptureController.shared.begin() }
         HotkeyManager.shared.register()
     }
diff --git a/build-app.sh b/build-app.sh
index db88268..eecc9da 100755
--- a/build-app.sh
+++ b/build-app.sh
@@ -108,9 +108,9 @@ cat > "$APP/Contents/Info.plist" <<'PLIST'
     <key>CFBundleIconFile</key>
     <string>Icon</string>
     <key>CFBundleShortVersionString</key>
-    <string>1.6.4</string>
+    <string>1.6.5</string>
     <key>CFBundleVersion</key>
-    <string>64</string>
+    <string>65</string>
     <key>LSUIElement</key>
     <true/>
     <key>NSHighResolutionCapable</key>