diff --git a/README.rst b/README.rst
index c7cb44f..85fd5e4 100644
--- a/README.rst
+++ b/README.rst
@@ -22,7 +22,7 @@ Programming
 
 The source code is mixed C and C++.
 
-This application is to be used with `Espressif IoT Development Framework`_ (ESP-IDF). It is tested with a version after v5.1 (rev b4268c874a4cf8fcf7c0c4153cffb76ad2ddda4e)
+This application is to be used with `Espressif IoT Development Framework`_ (ESP-IDF). It is tested with a version v5.5.2.
 
 Please check ESP-IDF docs for getting started instructions.
 
diff --git a/ci/build_for_pc.sh b/ci/build_for_pc.sh
index fdda2d8..7c11987 100755
--- a/ci/build_for_pc.sh
+++ b/ci/build_for_pc.sh
@@ -11,6 +11,6 @@ ninja
 cd ..
 mkdir build_clang
 cd build_clang
-CC=clang-15 CXX=clang++-15 cmake ../native -G Ninja -D CMAKE_CXX_FLAGS=-DASIO_STANDALONE
+CC=clang-20 CXX=clang++-20 cmake ../native -G Ninja -D CMAKE_CXX_FLAGS=-DASIO_STANDALONE
 ninja
 cd ..
diff --git a/ci/check_codestyle.sh b/ci/check_codestyle.sh
index de4e869..9c0038e 100755
--- a/ci/check_codestyle.sh
+++ b/ci/check_codestyle.sh
@@ -4,4 +4,4 @@
 
 set -eo pipefail
 
-ci/run-clang-format.py --clang-format-executable clang-format-15 -r main/ components/ native/
+ci/run-clang-format.py --clang-format-executable clang-format-20 -r main/ components/ native/
diff --git a/ci/static_code_analysis.sh b/ci/static_code_analysis.sh
index ceaaa1a..42a26f6 100755
--- a/ci/static_code_analysis.sh
+++ b/ci/static_code_analysis.sh
@@ -6,6 +6,6 @@ set -eo pipefail
 
 mkdir build_clang
 cd build_clang
-CC=clang-15 CXX=clang++-15 cmake ../native -G Ninja -D CMAKE_CXX_FLAGS=-DASIO_STANDALONE -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+CC=clang-20 CXX=clang++-20 cmake ../native -G Ninja -D CMAKE_CXX_FLAGS=-DASIO_STANDALONE -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
 
-run-clang-tidy-15.py -clang-tidy-binary clang-tidy-15
+run-clang-tidy-20.py -clang-tidy-binary clang-tidy-20
diff --git a/components/sip_client/idf_component.yml b/components/sip_client/idf_component.yml
index a6a9ead..0f7297f 100644
--- a/components/sip_client/idf_component.yml
+++ b/components/sip_client/idf_component.yml
@@ -1,11 +1,14 @@
 ## IDF Component Manager Manifest File
 dependencies:
   espressif/asio:
-    version: "^1.28.0"
+    version: "^1.32.0"
+    public: true
+  espressif/sock_utils:
+    version: "^0.1"
     public: true
   ## Required IDF version
   idf:
-    version: ">=5.1.0"
+    version: ">=5.5.2"
   # # Put list of dependencies here
   # # For components maintained by Espressif:
   # component: "~1.0.0"
diff --git a/components/web_server/include/web_server/web_server.h b/components/web_server/include/web_server/web_server.h
index 4a79261..3b3f22b 100644
--- a/components/web_server/include/web_server/web_server.h
+++ b/components/web_server/include/web_server/web_server.h
@@ -49,7 +49,7 @@ class WebServer
 
 public:
     explicit WebServer(SipClientT& client)
-        : client { client } {};
+        : client { client } { };
 
     WebServer(const WebServer&) = delete;
     WebServer(WebServer&&) = delete;
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 693fe78..14cf155 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM espressif/idf:release-v5.1
+FROM espressif/idf:release-v5.5
 
 ARG DEBIAN_FRONTEND=noninteractive
 
diff --git a/docker/run-docker.sh b/docker/run-docker.sh
index 5d8e36f..b842d1f 100755
--- a/docker/run-docker.sh
+++ b/docker/run-docker.sh
@@ -22,14 +22,14 @@ apt-get update \
 
 wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
 
-echo deb http://apt.llvm.org/${UBUNTU_CODENAME}/ llvm-toolchain-${UBUNTU_CODENAME}-15 main > /etc/apt/sources.list.d/llvm.list
+echo deb http://apt.llvm.org/${UBUNTU_CODENAME}/ llvm-toolchain-${UBUNTU_CODENAME}-20 main > /etc/apt/sources.list.d/llvm.list
 
-wget https://github.com/chriskohlhoff/asio/archive/asio-1-28-0.tar.gz -O /tmp/asio-1-28-0.tar.gz
+wget https://github.com/chriskohlhoff/asio/archive/asio-1-32-0.tar.gz -O /tmp/asio-1-32-0.tar.gz
 
-tar -C /usr/include --strip-components=3 -x -f /tmp/asio-1-28-0.tar.gz asio-asio-1-28-0/asio/include/
+tar -C /usr/include --strip-components=3 -x -f /tmp/asio-1-32-0.tar.gz asio-asio-1-32-0/asio/include/
 
 apt-get update \
-    && apt-get install -y clang-15 \
-	       clang-format-15 \
-	       clang-tidy-15 \
+    && apt-get install -y clang-20 \
+	       clang-format-20 \
+	       clang-tidy-20 \
     && rm -rf /var/lib/apt/lists/*
diff --git a/main/Kconfig.projbuild b/main/Kconfig.projbuild
index fab4610..53b6ca8 100644
--- a/main/Kconfig.projbuild
+++ b/main/Kconfig.projbuild
@@ -112,7 +112,7 @@ config CALL_TARGET_USER
 
 config CALLER_DISPLAY_MESSAGE
     string "Caller Display Message"
-        default "Türklingel"
+        default "Tuerklingel"
         help
                 This message is shown on the called device.
 
diff --git a/main/idf_component.yml b/main/idf_component.yml
index aecce6e..8645619 100644
--- a/main/idf_component.yml
+++ b/main/idf_component.yml
@@ -1,9 +1,9 @@
 ## IDF Component Manager Manifest File
 dependencies:
-  espressif/mdns: "^1.2.2"
+  espressif/mdns: "^1.9.1"
   ## Required IDF version
   idf:
-    version: ">=5.1.0"
+    version: ">=5.5.2"
   # # Put list of dependencies here
   # # For components maintained by Espressif:
   # component: "~1.0.0"