diff --git a/build.gradle b/build.gradle
index 25bcdf0f..b1279e5c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -78,7 +78,7 @@ spotless {
 	java {
 		target '**/*.java'
 		targetExclude "${protobuf.generatedFilesBaseDir}/**/*.java"
-		licenseHeader '/*\n * Copyright (c) $YEAR James Yuzawa (https://www.jyuzawa.com/)\n * All rights reserved. Licensed under the MIT License.\n */'
+		licenseHeader '/*\n * Copyright (c) $YEAR James Yuzawa (https://www.jyuzawa.com/)\n * SPDX-License-Identifier: MIT\n */'
 		removeUnusedImports()
 		importOrder()
 		palantirJavaFormat()
diff --git a/src/main/java/com/jyuzawa/googolplex_theater/GoogolplexTheater.java b/src/main/java/com/jyuzawa/googolplex_theater/GoogolplexTheater.java
index dfcf941f..1db3be66 100644
--- a/src/main/java/com/jyuzawa/googolplex_theater/GoogolplexTheater.java
+++ b/src/main/java/com/jyuzawa/googolplex_theater/GoogolplexTheater.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater;
 
diff --git a/src/main/java/com/jyuzawa/googolplex_theater/client/GoogolplexClientHandler.java b/src/main/java/com/jyuzawa/googolplex_theater/client/GoogolplexClientHandler.java
index 5d818fa6..47bef220 100644
--- a/src/main/java/com/jyuzawa/googolplex_theater/client/GoogolplexClientHandler.java
+++ b/src/main/java/com/jyuzawa/googolplex_theater/client/GoogolplexClientHandler.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.client;
 
diff --git a/src/main/java/com/jyuzawa/googolplex_theater/client/GoogolplexController.java b/src/main/java/com/jyuzawa/googolplex_theater/client/GoogolplexController.java
index 211a3021..502e9495 100644
--- a/src/main/java/com/jyuzawa/googolplex_theater/client/GoogolplexController.java
+++ b/src/main/java/com/jyuzawa/googolplex_theater/client/GoogolplexController.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.client;
 
diff --git a/src/main/java/com/jyuzawa/googolplex_theater/client/GoogolplexControllerImpl.java b/src/main/java/com/jyuzawa/googolplex_theater/client/GoogolplexControllerImpl.java
index 8c6bf467..21407c3d 100644
--- a/src/main/java/com/jyuzawa/googolplex_theater/client/GoogolplexControllerImpl.java
+++ b/src/main/java/com/jyuzawa/googolplex_theater/client/GoogolplexControllerImpl.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.client;
 
diff --git a/src/main/java/com/jyuzawa/googolplex_theater/client/ReceiverResponse.java b/src/main/java/com/jyuzawa/googolplex_theater/client/ReceiverResponse.java
index e377f1c0..1e1e9b5a 100644
--- a/src/main/java/com/jyuzawa/googolplex_theater/client/ReceiverResponse.java
+++ b/src/main/java/com/jyuzawa/googolplex_theater/client/ReceiverResponse.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.client;
 
diff --git a/src/main/java/com/jyuzawa/googolplex_theater/config/DeviceConfig.java b/src/main/java/com/jyuzawa/googolplex_theater/config/DeviceConfig.java
index 8a9d4695..3fc642e2 100644
--- a/src/main/java/com/jyuzawa/googolplex_theater/config/DeviceConfig.java
+++ b/src/main/java/com/jyuzawa/googolplex_theater/config/DeviceConfig.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.config;
 
diff --git a/src/main/java/com/jyuzawa/googolplex_theater/config/DeviceConfigLoader.java b/src/main/java/com/jyuzawa/googolplex_theater/config/DeviceConfigLoader.java
index c06da13e..51c20cf0 100644
--- a/src/main/java/com/jyuzawa/googolplex_theater/config/DeviceConfigLoader.java
+++ b/src/main/java/com/jyuzawa/googolplex_theater/config/DeviceConfigLoader.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.config;
 
diff --git a/src/main/java/com/jyuzawa/googolplex_theater/config/GoogolplexTheaterConfig.java b/src/main/java/com/jyuzawa/googolplex_theater/config/GoogolplexTheaterConfig.java
index 8e277090..0b0884ed 100644
--- a/src/main/java/com/jyuzawa/googolplex_theater/config/GoogolplexTheaterConfig.java
+++ b/src/main/java/com/jyuzawa/googolplex_theater/config/GoogolplexTheaterConfig.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.config;
 
diff --git a/src/main/java/com/jyuzawa/googolplex_theater/mdns/ServiceDiscovery.java b/src/main/java/com/jyuzawa/googolplex_theater/mdns/ServiceDiscovery.java
index 5c50ff30..26827f89 100644
--- a/src/main/java/com/jyuzawa/googolplex_theater/mdns/ServiceDiscovery.java
+++ b/src/main/java/com/jyuzawa/googolplex_theater/mdns/ServiceDiscovery.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.mdns;
 
diff --git a/src/main/java/com/jyuzawa/googolplex_theater/server/GoogolplexServer.java b/src/main/java/com/jyuzawa/googolplex_theater/server/GoogolplexServer.java
index c0af6676..177be6ac 100644
--- a/src/main/java/com/jyuzawa/googolplex_theater/server/GoogolplexServer.java
+++ b/src/main/java/com/jyuzawa/googolplex_theater/server/GoogolplexServer.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.server;
 
diff --git a/src/main/java/com/jyuzawa/googolplex_theater/util/MapperUtil.java b/src/main/java/com/jyuzawa/googolplex_theater/util/MapperUtil.java
index e668b90c..c23a5f4c 100644
--- a/src/main/java/com/jyuzawa/googolplex_theater/util/MapperUtil.java
+++ b/src/main/java/com/jyuzawa/googolplex_theater/util/MapperUtil.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.util;
 
diff --git a/src/test/java/com/jyuzawa/googolplex_theater/RunCucumber.java b/src/test/java/com/jyuzawa/googolplex_theater/RunCucumber.java
index bf3401f1..c0fb52b1 100644
--- a/src/test/java/com/jyuzawa/googolplex_theater/RunCucumber.java
+++ b/src/test/java/com/jyuzawa/googolplex_theater/RunCucumber.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater;
 
diff --git a/src/test/java/com/jyuzawa/googolplex_theater/StepDefinitions.java b/src/test/java/com/jyuzawa/googolplex_theater/StepDefinitions.java
index 9ccb17d0..7fe29aca 100644
--- a/src/test/java/com/jyuzawa/googolplex_theater/StepDefinitions.java
+++ b/src/test/java/com/jyuzawa/googolplex_theater/StepDefinitions.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater;
 
diff --git a/src/test/java/com/jyuzawa/googolplex_theater/client/FakeCast.java b/src/test/java/com/jyuzawa/googolplex_theater/client/FakeCast.java
index c2f96857..d7959212 100644
--- a/src/test/java/com/jyuzawa/googolplex_theater/client/FakeCast.java
+++ b/src/test/java/com/jyuzawa/googolplex_theater/client/FakeCast.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.client;
 
diff --git a/src/test/java/com/jyuzawa/googolplex_theater/client/GoogolplexControllerTest.java b/src/test/java/com/jyuzawa/googolplex_theater/client/GoogolplexControllerTest.java
index da9fc560..3be74a86 100644
--- a/src/test/java/com/jyuzawa/googolplex_theater/client/GoogolplexControllerTest.java
+++ b/src/test/java/com/jyuzawa/googolplex_theater/client/GoogolplexControllerTest.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.client;
 
diff --git a/src/test/java/com/jyuzawa/googolplex_theater/config/DeviceConfigLoaderTest.java b/src/test/java/com/jyuzawa/googolplex_theater/config/DeviceConfigLoaderTest.java
index f09f8216..dbb4da30 100644
--- a/src/test/java/com/jyuzawa/googolplex_theater/config/DeviceConfigLoaderTest.java
+++ b/src/test/java/com/jyuzawa/googolplex_theater/config/DeviceConfigLoaderTest.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.config;
 
diff --git a/src/test/java/com/jyuzawa/googolplex_theater/config/GoogolplexTheaterConfigTest.java b/src/test/java/com/jyuzawa/googolplex_theater/config/GoogolplexTheaterConfigTest.java
index 0958f93d..c1005dce 100644
--- a/src/test/java/com/jyuzawa/googolplex_theater/config/GoogolplexTheaterConfigTest.java
+++ b/src/test/java/com/jyuzawa/googolplex_theater/config/GoogolplexTheaterConfigTest.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.config;
 
diff --git a/src/test/java/com/jyuzawa/googolplex_theater/mdns/ServiceDiscoveryTest.java b/src/test/java/com/jyuzawa/googolplex_theater/mdns/ServiceDiscoveryTest.java
index 5ccd7889..24d556b6 100644
--- a/src/test/java/com/jyuzawa/googolplex_theater/mdns/ServiceDiscoveryTest.java
+++ b/src/test/java/com/jyuzawa/googolplex_theater/mdns/ServiceDiscoveryTest.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.mdns;
 
diff --git a/src/test/java/com/jyuzawa/googolplex_theater/server/GoogolplexServerTest.java b/src/test/java/com/jyuzawa/googolplex_theater/server/GoogolplexServerTest.java
index 27dbebcb..c5198f51 100644
--- a/src/test/java/com/jyuzawa/googolplex_theater/server/GoogolplexServerTest.java
+++ b/src/test/java/com/jyuzawa/googolplex_theater/server/GoogolplexServerTest.java
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2022 James Yuzawa (https://www.jyuzawa.com/)
- * All rights reserved. Licensed under the MIT License.
+ * SPDX-License-Identifier: MIT
  */
 package com.jyuzawa.googolplex_theater.server;