diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 3602c27..e4a8a62 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        LIBVER: ["develop", "v4.3.4", "v4.3.3", "v4.3.2"]
+        LIBVER: ["develop", "v4.3.5", "v4.3.4", "v4.3.3", "v4.3.2"]
     steps:
       - uses: actions/checkout@v4
       - name: setup
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..c25491c
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 3.20)
+
+project(MY_PROJECT VERSION 0.1.0 LANGUAGES CXX C)
+set(TARGET myproject)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+add_executable(${TARGET} client.cc common.cc)
+install(TARGETS ${TARGET} DESTINATION bin)
+
+target_include_directories(${TARGET}
+    PUBLIC ${PROJECT_BINARY_DIR}
+)
+
+target_link_libraries(${TARGET}
+    PRIVATE coap-3
+)
diff --git a/LICENSE b/LICENSE
index 64dd110..d1aab04 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2018-2024 obgm
+Copyright (c) 2018-2026 Olaf Bergmann <bergmann@tzi.org>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/Makefile b/Makefile
index 99a1686..b588497 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 # Makefile for libcoap minimal examples
 #
-# Copyright (C) 2018-2024 Olaf Bergmann <bergmann@tzi.org>
+# Copyright (C) 2018-2026 Olaf Bergmann <bergmann@tzi.org>
 #
 
 LIBCOAP?=libcoap-3
diff --git a/README.md b/README.md
index d541996..3c9f5f9 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ then this is handled by a NON-confirmable request.
 It has two defined resources `/hello` and `hello/my` along with the
 inbuilt resource `.well-known/core`.
 
-Copyright (C) 2018-2024 Olaf Bergmann <bergmann@tzi.org>
+Copyright (C) 2018-2026 Olaf Bergmann <bergmann@tzi.org>
 
 License
 =======
diff --git a/client.cc b/client.cc
index df09739..c8da81e 100644
--- a/client.cc
+++ b/client.cc
@@ -1,6 +1,6 @@
 /* minimal CoAP client
  *
- * Copyright (C) 2018-2024 Olaf Bergmann <bergmann@tzi.org>
+ * Copyright (C) 2018-2026 Olaf Bergmann <bergmann@tzi.org>
  */
 
 /*
diff --git a/common.cc b/common.cc
index 7b4e3a9..d2b6550 100644
--- a/common.cc
+++ b/common.cc
@@ -1,6 +1,6 @@
 /* minimal CoAP functions
  *
- * Copyright (C) 2018-2024 Olaf Bergmann <bergmann@tzi.org>
+ * Copyright (C) 2018-2026 Olaf Bergmann <bergmann@tzi.org>
  */
 
 #include <cstdio>
diff --git a/common.hh b/common.hh
index da0c4c5..53ada08 100644
--- a/common.hh
+++ b/common.hh
@@ -1,6 +1,6 @@
 /* minimal CoAP functions
  *
- * Copyright (C) 2018-2024 Olaf Bergmann <bergmann@tzi.org>
+ * Copyright (C) 2018-2026 Olaf Bergmann <bergmann@tzi.org>
  */
 
 #include <coap3/coap.h>
diff --git a/server.cc b/server.cc
index 2c97dc9..876fbeb 100644
--- a/server.cc
+++ b/server.cc
@@ -1,6 +1,6 @@
 /* minimal CoAP server
  *
- * Copyright (C) 2018-2024 Olaf Bergmann <bergmann@tzi.org>
+ * Copyright (C) 2018-2026 Olaf Bergmann <bergmann@tzi.org>
  */
 
 #include <cstring>