diff --git a/.github/workflows/matrix.json b/.github/workflows/matrix.json
index 4560bab2e73a6c..dd3cd1b4d988fc 100644
--- a/.github/workflows/matrix.json
+++ b/.github/workflows/matrix.json
@@ -14,7 +14,7 @@
       {
         "depends_name": "x86_64-pc-linux-gnu_multiprocess",
         "host": "x86_64-pc-linux-gnu",
-        "dep_opts": "DEBUG=1 MULTIPROCESS=1 CC=clang-16 CXX=clang++-16"
+        "dep_opts": "DEBUG=1 MULTIPROCESS=1 CC=clang-18 CXX=clang++-18"
       },
       {
         "depends_name": "x86_64-pc-linux-gnu_nowallet",
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 743a2164b559ae..477d1f01a84dcf 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -209,7 +209,7 @@ x86_64-pc-linux-gnu_multiprocess:
     - .skip-in-fast-mode-template
   variables:
     HOST: x86_64-pc-linux-gnu
-    DEP_OPTS: "DEBUG=1 MULTIPROCESS=1 CC=clang-16 CXX=clang++-16"
+    DEP_OPTS: "DEBUG=1 MULTIPROCESS=1 CC=clang-18 CXX=clang++-18"
 
 x86_64-apple-darwin:
   extends:
diff --git a/ci/test/00_setup_env_native_fuzz.sh b/ci/test/00_setup_env_native_fuzz.sh
index 8c14c618dfa2d8..ad69665b6aec7a 100755
--- a/ci/test/00_setup_env_native_fuzz.sh
+++ b/ci/test/00_setup_env_native_fuzz.sh
@@ -16,4 +16,4 @@ export RUN_UNIT_TESTS=false
 export RUN_FUNCTIONAL_TESTS=false
 export RUN_FUZZ_TESTS=true
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-zmq --disable-ccache --enable-fuzz --with-sanitizers=fuzzer,address,undefined,integer --enable-suppress-external-warnings CC=clang-16 CXX=clang++-16"
+export BITCOIN_CONFIG="--enable-zmq --disable-ccache --enable-fuzz --with-sanitizers=fuzzer,address,undefined,integer --enable-suppress-external-warnings CC=clang-18 CXX=clang++-18"
diff --git a/ci/test/00_setup_env_native_fuzz_with_valgrind.sh b/ci/test/00_setup_env_native_fuzz_with_valgrind.sh
index b5c6b60b4a73ab..9860123546744e 100755
--- a/ci/test/00_setup_env_native_fuzz_with_valgrind.sh
+++ b/ci/test/00_setup_env_native_fuzz_with_valgrind.sh
@@ -14,4 +14,4 @@ export RUN_FUNCTIONAL_TESTS=false
 export RUN_FUZZ_TESTS=true
 export FUZZ_TESTS_CONFIG="--valgrind"
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-fuzz --with-sanitizers=fuzzer --enable-suppress-external-warnings CC=clang-16 CXX=clang++-16"
+export BITCOIN_CONFIG="--enable-fuzz --with-sanitizers=fuzzer --enable-suppress-external-warnings CC=clang-18 CXX=clang++-18"
diff --git a/ci/test/00_setup_env_native_multiprocess.sh b/ci/test/00_setup_env_native_multiprocess.sh
index 06f5eeb4815738..b63f7aeb6f79a2 100755
--- a/ci/test/00_setup_env_native_multiprocess.sh
+++ b/ci/test/00_setup_env_native_multiprocess.sh
@@ -10,5 +10,5 @@ export CONTAINER_NAME=ci_native_multiprocess
 export PACKAGES="cmake python3 llvm clang"
 export DEP_OPTS="DEBUG=1 MULTIPROCESS=1"
 export GOAL="install"
-export BITCOIN_CONFIG="--with-boost-process --enable-debug CC=clang-16 CXX=clang++-16" # Use clang to avoid OOM
+export BITCOIN_CONFIG="--with-boost-process --enable-debug CC=clang-18 CXX=clang++-18" # Use clang to avoid OOM
 export BITCOIND=dash-node  # Used in functional tests
diff --git a/ci/test/00_setup_env_native_tsan.sh b/ci/test/00_setup_env_native_tsan.sh
index 633304580f40ed..ffa3d8365c8584 100755
--- a/ci/test/00_setup_env_native_tsan.sh
+++ b/ci/test/00_setup_env_native_tsan.sh
@@ -7,11 +7,11 @@
 export LC_ALL=C.UTF-8
 
 export CONTAINER_NAME=ci_native_tsan
-export PACKAGES="clang-16 llvm-16 libclang-rt-16-dev libc++abi-16-dev libc++-16-dev python3-zmq"
-export DEP_OPTS="CC=clang-16 CXX='clang++-16 -stdlib=libc++'"
+export PACKAGES="clang-18 llvm-18 libclang-rt-18-dev libc++abi-18-dev libc++-18-dev python3-zmq"
+export DEP_OPTS="CC=clang-18 CXX='clang++-18 -stdlib=libc++'"
 export TEST_RUNNER_EXTRA="--extended --exclude feature_pruning,feature_dbcrash,wallet_multiwallet.py" # Temporarily suppress ASan heap-use-after-free (see issue #14163)
 export TEST_RUNNER_EXTRA="${TEST_RUNNER_EXTRA} --timeout-factor=4"  # Increase timeout because sanitizers slow down
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-zmq --with-gui=no --with-sanitizers=thread CC=clang-16 CXX=clang++-16 CXXFLAGS='-g' --with-boost-process"
+export BITCOIN_CONFIG="--enable-zmq --with-gui=no --with-sanitizers=thread CC=clang-18 CXX=clang++-18 CXXFLAGS='-g' --with-boost-process"
 export CPPFLAGS="-DDEBUG_LOCKORDER -DARENA_DEBUG"
 export PYZMQ=true
diff --git a/ci/test/00_setup_env_native_ubsan.sh b/ci/test/00_setup_env_native_ubsan.sh
index 3d44490a4f1029..9fb440dfd41e2d 100755
--- a/ci/test/00_setup_env_native_ubsan.sh
+++ b/ci/test/00_setup_env_native_ubsan.sh
@@ -8,8 +8,8 @@
 export LC_ALL=C.UTF-8
 
 export CONTAINER_NAME=ci_native_ubsan
-export PACKAGES="clang-16 llvm-16 python3-zmq qtbase5-dev qttools5-dev-tools libevent-dev bsdmainutils libboost-dev libdb5.3++-dev libminiupnpc-dev libzmq3-dev libqrencode-dev"
+export PACKAGES="clang-18 llvm-18 python3-zmq qtbase5-dev qttools5-dev-tools libevent-dev bsdmainutils libboost-dev libdb5.3++-dev libminiupnpc-dev libzmq3-dev libqrencode-dev"
 export DEP_OPTS="NO_UPNP=1 DEBUG=1"
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-zmq --enable-reduce-exports --enable-crash-hooks --with-sanitizers=undefined CC=clang-16 CXX=clang++-16"
+export BITCOIN_CONFIG="--enable-zmq --enable-reduce-exports --enable-crash-hooks --with-sanitizers=undefined CC=clang-18 CXX=clang++-18"
 export PYZMQ=true
diff --git a/ci/test/00_setup_env_native_valgrind.sh b/ci/test/00_setup_env_native_valgrind.sh
index 2703963a055493..b0793313fb1a56 100755
--- a/ci/test/00_setup_env_native_valgrind.sh
+++ b/ci/test/00_setup_env_native_valgrind.sh
@@ -11,4 +11,4 @@ export USE_VALGRIND=1
 export NO_DEPENDS=1
 export TEST_RUNNER_EXTRA="--exclude rpc_bind --timeout-factor=4"  # Excluded for now, see https://github.com/bitcoin/bitcoin/issues/17765#issuecomment-602068547
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-zmq --with-incompatible-bdb --with-gui=no --enable-suppress-external-warnings CC=clang-16 CXX=clang++-16"  # TODO enable GUI
+export BITCOIN_CONFIG="--enable-zmq --with-incompatible-bdb --with-gui=no --enable-suppress-external-warnings CC=clang-18 CXX=clang++-18"  # TODO enable GUI
diff --git a/contrib/containers/ci/Dockerfile b/contrib/containers/ci/Dockerfile
index c4125752e26209..fb3f5923352e28 100644
--- a/contrib/containers/ci/Dockerfile
+++ b/contrib/containers/ci/Dockerfile
@@ -51,7 +51,7 @@ RUN apt-get update && apt-get install $APT_ARGS \
 # Install Clang+LLVM and set it as default
 # We don't need all packages but the default set doesn't include some
 # packages we want so we will need to install some of them manually.
-ARG LLVM_VERSION=16
+ARG LLVM_VERSION=18
 RUN set -ex; \
     cd /tmp && \
     wget https://apt.llvm.org/llvm.sh && \