diff --git a/build.gradle.kts b/build.gradle.kts
index ca24be87..9904b268 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -123,8 +123,8 @@ subprojects {
     }
 
     dependencies {
-        pmd("net.sourceforge.pmd:pmd-ant:7.27.0")
-        pmd("net.sourceforge.pmd:pmd-java:7.27.0")
+        pmd("net.sourceforge.pmd:pmd-ant:7.28.0")
+        pmd("net.sourceforge.pmd:pmd-java:7.28.0")
         spotbugsPlugins("com.h3xstream.findsecbugs:findsecbugs-plugin:1.14.0")
     }
 
diff --git a/coap-core/src/main/java/com/mbed/coap/server/block/BlockWiseOutgoingFilter.java b/coap-core/src/main/java/com/mbed/coap/server/block/BlockWiseOutgoingFilter.java
index bde61293..2a6f1d95 100644
--- a/coap-core/src/main/java/com/mbed/coap/server/block/BlockWiseOutgoingFilter.java
+++ b/coap-core/src/main/java/com/mbed/coap/server/block/BlockWiseOutgoingFilter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2022 java-coap contributors (https://github.com/open-coap/java-coap)
+ * Copyright (C) 2022-2026 java-coap contributors (https://github.com/open-coap/java-coap)
  * Copyright (C) 2011-2021 ARM Limited. All rights reserved.
  * SPDX-License-Identifier: Apache-2.0
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -16,7 +16,7 @@
  */
 package com.mbed.coap.server.block;
 
-import static com.mbed.coap.utils.FutureHelpers.*;
+import static com.mbed.coap.utils.FutureHelpers.failedFuture;
 import com.mbed.coap.exception.CoapException;
 import com.mbed.coap.packet.CoapRequest;
 import com.mbed.coap.packet.CoapResponse;
diff --git a/coap-core/src/main/java/com/mbed/coap/server/filter/SequentialTaskRunner.java b/coap-core/src/main/java/com/mbed/coap/server/filter/SequentialTaskRunner.java
index 39761e74..51b2535f 100644
--- a/coap-core/src/main/java/com/mbed/coap/server/filter/SequentialTaskRunner.java
+++ b/coap-core/src/main/java/com/mbed/coap/server/filter/SequentialTaskRunner.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2022 java-coap contributors (https://github.com/open-coap/java-coap)
+ * Copyright (C) 2022-2026 java-coap contributors (https://github.com/open-coap/java-coap)
  * SPDX-License-Identifier: Apache-2.0
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,7 +15,8 @@
  */
 package com.mbed.coap.server.filter;
 
-import static com.mbed.coap.utils.FutureHelpers.*;
+import static com.mbed.coap.utils.FutureHelpers.become;
+import static com.mbed.coap.utils.FutureHelpers.failedFuture;
 import com.mbed.coap.exception.TooManyRequestsForEndpointException;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.atomic.AtomicInteger;
diff --git a/coap-core/src/main/java/com/mbed/coap/server/messaging/PiggybackedExchangeFilter.java b/coap-core/src/main/java/com/mbed/coap/server/messaging/PiggybackedExchangeFilter.java
index 614f0f46..0b2e101e 100644
--- a/coap-core/src/main/java/com/mbed/coap/server/messaging/PiggybackedExchangeFilter.java
+++ b/coap-core/src/main/java/com/mbed/coap/server/messaging/PiggybackedExchangeFilter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2022 java-coap contributors (https://github.com/open-coap/java-coap)
+ * Copyright (C) 2022-2026 java-coap contributors (https://github.com/open-coap/java-coap)
  * SPDX-License-Identifier: Apache-2.0
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
  */
 package com.mbed.coap.server.messaging;
 
-import static com.mbed.coap.utils.Validations.*;
+import static com.mbed.coap.utils.Validations.require;
 import com.mbed.coap.packet.CoapPacket;
 import com.mbed.coap.packet.MessageType;
 import com.mbed.coap.utils.Filter;
diff --git a/coap-tcp/src/main/java/com/mbed/coap/server/messaging/PayloadSizeVerifier.java b/coap-tcp/src/main/java/com/mbed/coap/server/messaging/PayloadSizeVerifier.java
index 853f1191..5f21f9a3 100644
--- a/coap-tcp/src/main/java/com/mbed/coap/server/messaging/PayloadSizeVerifier.java
+++ b/coap-tcp/src/main/java/com/mbed/coap/server/messaging/PayloadSizeVerifier.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2022 java-coap contributors (https://github.com/open-coap/java-coap)
+ * Copyright (C) 2022-2026 java-coap contributors (https://github.com/open-coap/java-coap)
  * SPDX-License-Identifier: Apache-2.0
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
  */
 package com.mbed.coap.server.messaging;
 
-import static com.mbed.coap.utils.FutureHelpers.*;
+import static com.mbed.coap.utils.FutureHelpers.failedFuture;
 import com.mbed.coap.exception.CoapException;
 import com.mbed.coap.packet.CoapPacket;
 import com.mbed.coap.utils.Filter;