diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0228e46af380..b5d486d32327 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -63,13 +63,13 @@ jobs:
       file: ./contrib/containers/ci/ci-slim.Dockerfile
       name: dashcore-ci-slim
 
-  depends-arm-linux:
-    name: arm-linux-gnueabihf
+  depends-aarch64-linux:
+    name: aarch64-linux-gnu
     uses: ./.github/workflows/build-depends.yml
     needs: [container, cache-sources]
     if: ${{ vars.SKIP_ARM_LINUX == '' }}
     with:
-      build-target: arm-linux
+      build-target: aarch64-linux
       container-path: ${{ needs.container.outputs.path }}
 
   depends-linux64:
@@ -131,16 +131,16 @@ jobs:
     with:
       container-path: ${{ needs.container-slim.outputs.path }}
 
-  src-arm-linux:
-    name: arm-linux-build
+  src-aarch64-linux:
+    name: aarch64-linux-build
     uses: ./.github/workflows/build-src.yml
-    needs: [container, depends-arm-linux]
+    needs: [container, depends-aarch64-linux]
     with:
-      build-target: arm-linux
+      build-target: aarch64-linux
       container-path: ${{ needs.container.outputs.path }}
-      depends-key: ${{ needs.depends-arm-linux.outputs.key }}
-      depends-host: ${{ needs.depends-arm-linux.outputs.host }}
-      depends-dep-opts: ${{ needs.depends-arm-linux.outputs.dep-opts }}
+      depends-key: ${{ needs.depends-aarch64-linux.outputs.key }}
+      depends-host: ${{ needs.depends-aarch64-linux.outputs.host }}
+      depends-dep-opts: ${{ needs.depends-aarch64-linux.outputs.dep-opts }}
 
   src-linux64:
     name: linux64-build
diff --git a/.github/workflows/guix-build.yml b/.github/workflows/guix-build.yml
index b0c7911ef394..05deaf7b56d9 100644
--- a/.github/workflows/guix-build.yml
+++ b/.github/workflows/guix-build.yml
@@ -75,7 +75,7 @@ jobs:
     runs-on: ubuntu-24.04-arm
     strategy:
       matrix:
-        build_target: [x86_64-linux-gnu, arm-linux-gnueabihf, aarch64-linux-gnu, riscv64-linux-gnu, powerpc64-linux-gnu, x86_64-w64-mingw32, x86_64-apple-darwin, arm64-apple-darwin]
+        build_target: [x86_64-linux-gnu, aarch64-linux-gnu, riscv64-linux-gnu, powerpc64-linux-gnu, x86_64-w64-mingw32, x86_64-apple-darwin, arm64-apple-darwin]
 
     timeout-minutes: 480
     steps:
diff --git a/ci/dash/matrix.sh b/ci/dash/matrix.sh
index a5d60838285a..6e249fc476d1 100755
--- a/ci/dash/matrix.sh
+++ b/ci/dash/matrix.sh
@@ -16,8 +16,8 @@ export LSAN_OPTIONS="suppressions=${BASE_ROOT_DIR}/test/sanitizer_suppressions/l
 export TSAN_OPTIONS="suppressions=${BASE_ROOT_DIR}/test/sanitizer_suppressions/tsan:halt_on_error=1"
 export UBSAN_OPTIONS="suppressions=${BASE_ROOT_DIR}/test/sanitizer_suppressions/ubsan:print_stacktrace=1:halt_on_error=1:report_error_type=1"
 
-if [ "$BUILD_TARGET" = "arm-linux" ]; then
-  source ./ci/test/00_setup_env_arm.sh
+if [ "$BUILD_TARGET" = "aarch64-linux" ]; then
+  source ./ci/test/00_setup_env_aarch64.sh
 elif [ "$BUILD_TARGET" = "linux64" ]; then
   source ./ci/test/00_setup_env_native_qt5.sh
 elif [ "$BUILD_TARGET" = "linux64_asan" ]; then
diff --git a/ci/test/00_setup_env.sh b/ci/test/00_setup_env.sh
index 4207615a1a94..626394cb5d7b 100755
--- a/ci/test/00_setup_env.sh
+++ b/ci/test/00_setup_env.sh
@@ -71,7 +71,7 @@ export BASE_OUTDIR=${BASE_OUTDIR:-$BASE_SCRATCH_DIR/out/$HOST}
 # Folder where the build is done (dist and out-of-tree build).
 export BASE_BUILD_DIR=${BASE_BUILD_DIR:-$BASE_SCRATCH_DIR/build-ci}
 export PREVIOUS_RELEASES_DIR=${PREVIOUS_RELEASES_DIR:-$BASE_ROOT_DIR/releases/$HOST}
-export SDK_URL=${SDK_URL:-https://bitcoincore.org/depends-sources/sdks}
+export SDK_URL=${SDK_URL:-https://s3.us-west-2.amazonaws.com/dash-depends-sources}
 export DOCKER_PACKAGES=${DOCKER_PACKAGES:-build-essential libtool autotools-dev automake pkg-config bsdmainutils curl ca-certificates ccache python3 rsync git procps}
 export GOAL=${GOAL:-install}
 export DIR_QA_ASSETS=${DIR_QA_ASSETS:-${BASE_SCRATCH_DIR}/qa-assets}
diff --git a/ci/test/00_setup_env_arm.sh b/ci/test/00_setup_env_aarch64.sh
similarity index 51%
rename from ci/test/00_setup_env_arm.sh
rename to ci/test/00_setup_env_aarch64.sh
index edbc9334928f..d1edb9b95f38 100755
--- a/ci/test/00_setup_env_arm.sh
+++ b/ci/test/00_setup_env_aarch64.sh
@@ -6,23 +6,21 @@
 
 export LC_ALL=C.UTF-8
 
-export HOST=arm-linux-gnueabihf
+export HOST=aarch64-linux-gnu
 # The host arch is unknown, so we run the tests through qemu.
-# If the host is arm and wants to run the tests natively, it can set QEMU_USER_CMD to the empty string.
-if [ -z ${QEMU_USER_CMD+x} ]; then export QEMU_USER_CMD="${QEMU_USER_CMD:-"qemu-arm -L /usr/arm-linux-gnueabihf/"}"; fi
-export DPKG_ADD_ARCH="armhf"
-export PACKAGES="python3-zmq g++-arm-linux-gnueabihf busybox libc6:armhf libstdc++6:armhf libfontconfig1:armhf libxcb1:armhf"
+# If the host is arm64 and wants to run the tests natively, it can set QEMU_USER_CMD to the empty string.
+if [ -z ${QEMU_USER_CMD+x} ]; then export QEMU_USER_CMD="${QEMU_USER_CMD:-"qemu-aarch64 -L /usr/aarch64-linux-gnu/"}"; fi
+export DPKG_ADD_ARCH="arm64"
+export PACKAGES="python3-zmq g++-aarch64-linux-gnu busybox libc6:arm64 libstdc++6:arm64 libfontconfig1:arm64 libxcb1:arm64"
 if [ -n "$QEMU_USER_CMD" ]; then
   # Likely cross-compiling, so install the needed gcc and qemu-user
   export PACKAGES="$PACKAGES qemu-user"
 fi
-export CONTAINER_NAME=ci_arm_linux
+export CONTAINER_NAME=ci_aarch64_linux
 # Use debian to avoid 404 apt errors when cross compiling
 export CHECK_DOC=0
 export USE_BUSY_BOX=true
 export RUN_UNIT_TESTS=false
 export RUN_FUNCTIONAL_TESTS=false
 export GOAL="install"
-# -Wno-psabi is to disable ABI warnings: "note: parameter passing for argument of type ... changed in GCC 7.1"
-# This could be removed once the ABI change warning does not show up by default
-export BITCOIN_CONFIG="--enable-reduce-exports CXXFLAGS=-Wno-psabi"
+export BITCOIN_CONFIG="--enable-reduce-exports"
diff --git a/ci/test/00_setup_env_mac.sh b/ci/test/00_setup_env_mac.sh
index ca04e916fc2a..244ec7138044 100755
--- a/ci/test/00_setup_env_mac.sh
+++ b/ci/test/00_setup_env_mac.sh
@@ -8,9 +8,9 @@ export LC_ALL=C.UTF-8
 
 export CONTAINER_NAME=ci_macos_cross
 export HOST=x86_64-apple-darwin
-export PACKAGES="clang cmake lld llvm  zip"
-export XCODE_VERSION=15.0
-export XCODE_BUILD_ID=15A240d
+export PACKAGES="clang cmake lld llvm zip"
+export XCODE_VERSION=16.0
+export XCODE_BUILD_ID=16A242d
 export RUN_UNIT_TESTS=false
 export RUN_FUNCTIONAL_TESTS=false
 export GOAL="all deploy"
diff --git a/contrib/containers/ci/ci.Dockerfile b/contrib/containers/ci/ci.Dockerfile
index 2f0659cbf01f..42df9b08018c 100644
--- a/contrib/containers/ci/ci.Dockerfile
+++ b/contrib/containers/ci/ci.Dockerfile
@@ -19,8 +19,9 @@ RUN set -ex; \
     cmake \
     g++-11 \
     g++-14 \
-    g++-arm-linux-gnueabihf \
+    g++-aarch64-linux-gnu \
     g++-mingw-w64-x86-64 \
+    g++-x86-64-linux-gnu \
     gawk \
     gettext \
     libtool \
diff --git a/contrib/containers/deploy/Dockerfile.GitHubActions.Dispatch b/contrib/containers/deploy/Dockerfile.GitHubActions.Dispatch
index 4db05ed6c25f..c6452786809b 100644
--- a/contrib/containers/deploy/Dockerfile.GitHubActions.Dispatch
+++ b/contrib/containers/deploy/Dockerfile.GitHubActions.Dispatch
@@ -9,7 +9,7 @@ RUN apt-get update && \
     build-essential \
     ca-certificates \
     curl \
-    g++-arm-linux-gnueabihf \
+    g++-aarch64-linux-gnu \
     libtool \
     pkg-config \
     python3 \
@@ -23,14 +23,14 @@ COPY . .
 ARG TARGETPLATFORM
 
 RUN case "$TARGETPLATFORM" in \
-  "linux/arm64") make HOST=arm-linux-gnueabihf -C depends -j`nproc | awk '{x=$1/2; print x}'` ;; \
+  "linux/arm64") make HOST=aarch64-linux-gnu -C depends -j`nproc | awk '{x=$1/2; print x}'` ;; \
   "linux/amd64") make HOST=x86_64-pc-linux-gnu -C depends -j`nproc | awk '{x=$1/2; print x}'` ;; \
   *) exit 1 ;; \
 esac
 
 RUN ./autogen.sh && \
   case "$TARGETPLATFORM" in \
-  "linux/arm64") ./configure --prefix=`pwd`/depends/arm-linux-gnueabihf ;; \
+  "linux/arm64") ./configure --prefix=`pwd`/depends/aarch64-linux-gnu ;; \
   "linux/amd64") ./configure --prefix=`pwd`/depends/x86_64-pc-linux-gnu ;; \
 esac
 
@@ -38,7 +38,7 @@ RUN make -j`nproc | awk '{x=$1/2; print x}'` && make install
 
 RUN mkdir built-target && \
   case "$TARGETPLATFORM" in \
-  "linux/arm64") cp depends/arm-linux-gnueabihf/bin/dash* /home/dash/built-target ;; \
+  "linux/arm64") cp depends/aarch64-linux-gnu/bin/dash* /home/dash/built-target ;; \
   "linux/amd64") cp depends/x86_64-pc-linux-gnu/bin/dash* /home/dash/built-target ;; \
 esac
 
diff --git a/contrib/containers/guix/scripts/setup-sdk b/contrib/containers/guix/scripts/setup-sdk
index 9781ce07285d..8034fa63d581 100755
--- a/contrib/containers/guix/scripts/setup-sdk
+++ b/contrib/containers/guix/scripts/setup-sdk
@@ -7,12 +7,13 @@ export LC_ALL=C.UTF-8
 
 set -eo pipefail
 
-SDK_URL="${SDK_URL:-https://bitcoincore.org/depends-sources/sdks}"
+SDK_URL="${SDK_URL:-https://s3.us-west-2.amazonaws.com/dash-depends-sources}"
 SDK_PATH="${SDK_PATH:-depends/SDKs}"
 SDK_SOURCES="${SDK_SOURCES:-depends/sdk-sources}"
-XCODE_VERSION="${XCODE_VERSION:-15.0}"
-XCODE_RELEASE="${XCODE_RELEASE:-15A240d}"
+XCODE_VERSION="${XCODE_VERSION:-16.0}"
+XCODE_RELEASE="${XCODE_RELEASE:-16A242d}"
 XCODE_ARCHIVE="Xcode-${XCODE_VERSION}-${XCODE_RELEASE}-extracted-SDK-with-libcxx-headers"
+XCODE_AR_HASH="${XCODE_AR_HASH:-bce59aa16560f182e44200a0b9539bd637c8b5c7089fbff13b0712730ce162ff}"
 XCODE_AR_PATH="${SDK_SOURCES}/${XCODE_ARCHIVE}.tar.gz"
 
 if [ ! -d "${SDK_PATH}/${XCODE_ARCHIVE}" ]; then
@@ -21,6 +22,11 @@ if [ ! -d "${SDK_PATH}/${XCODE_ARCHIVE}" ]; then
         mkdir -p "${SDK_SOURCES}"
         curl --location --fail "${SDK_URL}/${XCODE_ARCHIVE}.tar.gz" -o "${XCODE_AR_PATH}"
     fi
+    echo "Verifying macOS SDK..."
+    if [ "$(sha256sum "${XCODE_AR_PATH}" | cut -d' ' -f1)" != "${XCODE_AR_HASH}" ]; then
+        echo "ERROR: Checksum mismatch for ${XCODE_AR_PATH}"
+        exit 1
+    fi
     echo "Extracting macOS SDK..."
     mkdir -p "${SDK_PATH}"
     tar -C "${SDK_PATH}" -xf "${XCODE_AR_PATH}"
diff --git a/contrib/guix/README.md b/contrib/guix/README.md
index 5e468c783977..366ba7dfc951 100644
--- a/contrib/guix/README.md
+++ b/contrib/guix/README.md
@@ -249,7 +249,7 @@ details.
   Set the path where _extracted_ SDKs can be found. This is passed through to
   the depends tree. Note that this is should be set to the _parent_ directory of
   the actual SDK (e.g. `SDK_PATH=$HOME/Downloads/macOS-SDKs` instead of
-  `$HOME/Downloads/macOS-SDKs/Xcode-12.2-12B45b-extracted-SDK-with-libcxx-headers`).
+  `$HOME/Downloads/macOS-SDKs/Xcode-16.0-16A242d-extracted-SDK-with-libcxx-headers`).
 
   The path that this environment variable points to **must be a directory**, and
   **NOT a symlink to a directory**.
diff --git a/contrib/guix/symbol-check.py b/contrib/guix/symbol-check.py
index bca9029b24d8..b2dc20cb5266 100755
--- a/contrib/guix/symbol-check.py
+++ b/contrib/guix/symbol-check.py
@@ -235,12 +235,12 @@ def check_MACHO_libraries(binary) -> bool:
     return ok
 
 def check_MACHO_min_os(binary) -> bool:
-    if binary.build_version.minos == [14,0,0]:
+    if binary.build_version.minos == [14, 0, 0]:
         return True
     return False
 
 def check_MACHO_sdk(binary) -> bool:
-    if binary.build_version.sdk == [14, 0, 0]:
+    if binary.build_version.sdk == [15, 0, 0]:
         return True
     return False
 
diff --git a/contrib/macdeploy/README.md b/contrib/macdeploy/README.md
index cf32a07602d3..86d122f6dfae 100644
--- a/contrib/macdeploy/README.md
+++ b/contrib/macdeploy/README.md
@@ -15,14 +15,14 @@ When complete, it will have produced `Dash-Core.zip`.
 A free Apple Developer Account is required to proceed.
 
 Our macOS SDK can be extracted from
-[Xcode_15.xip](https://download.developer.apple.com/Developer_Tools/Xcode_15/Xcode_15.xip).
+[Xcode_16.xip](https://download.developer.apple.com/Developer_Tools/Xcode_16/Xcode_16.xip).
 
 Alternatively, after logging in to your account go to 'Downloads', then 'More'
-and search for [`Xcode 15`](https://developer.apple.com/download/all/?q=Xcode%2015).
+and search for [`Xcode 16`](https://developer.apple.com/download/all/?q=Xcode%2016).
 
 An Apple ID and cookies enabled for the hostname are needed to download this.
 
-The `sha256sum` of the downloaded XIP archive should be `4daaed2ef2253c9661779fa40bfff50655dc7ec45801aba5a39653e7bcdde48e`.
+The `sha256sum` of the downloaded XIP archive should be `4a26c3d102a55c7222fb145e0ee1503249c9c26c6e02dc64d783c8810b37b1e3`.
 
 To extract the `.xip` on Linux:
 
@@ -33,13 +33,13 @@ git clone https://github.com/bitcoin-core/apple-sdk-tools.git
 
 # Unpack the .xip and place the resulting Xcode.app in your current
 # working directory
-python3 apple-sdk-tools/extract_xcode.py -f Xcode_15.xip | cpio -d -i
+python3 apple-sdk-tools/extract_xcode.py -f Xcode_16.xip | cpio -d -i
 ```
 
 On macOS:
 
 ```bash
-xip -x Xcode_15.xip
+xip -x Xcode_16.xip
 ```
 
 ### Step 2: Generating the SDK tarball from `Xcode.app`
@@ -51,8 +51,8 @@ path to `Xcode.app` (extracted in the previous stage) as the first argument.
 ./contrib/macdeploy/gen-sdk '/path/to/Xcode.app'
 ```
 
-The generated archive should be: `Xcode-15.0-15A240d-extracted-SDK-with-libcxx-headers.tar.gz`.
-The `sha256sum` should be `c0c2e7bb92c1fee0c4e9f3a485e4530786732d6c6dd9e9f418c282aa6892f55d`.
+The generated archive should be: `Xcode-16.0-16A242d-extracted-SDK-with-libcxx-headers.tar.gz`.
+The `sha256sum` should be `bce59aa16560f182e44200a0b9539bd637c8b5c7089fbff13b0712730ce162ff`.
 
 ## Deterministic macOS App Notes
 
diff --git a/depends/hosts/darwin.mk b/depends/hosts/darwin.mk
index 1b187711bfd8..eb5e3d15b3d7 100644
--- a/depends/hosts/darwin.mk
+++ b/depends/hosts/darwin.mk
@@ -1,7 +1,7 @@
 OSX_MIN_VERSION=14.0
-OSX_SDK_VERSION=14.0
-XCODE_VERSION=15.0
-XCODE_BUILD_ID=15A240d
+OSX_SDK_VERSION=15.0
+XCODE_VERSION=16.0
+XCODE_BUILD_ID=16A242d
 LLD_VERSION=711
 
 OSX_SDK=$(SDK_PATH)/Xcode-$(XCODE_VERSION)-$(XCODE_BUILD_ID)-extracted-SDK-with-libcxx-headers
@@ -13,8 +13,10 @@ OSX_SDK=$(SDK_PATH)/Xcode-$(XCODE_VERSION)-$(XCODE_BUILD_ID)-extracted-SDK-with-
 # distro releases.
 #
 # Source: https://lists.gnu.org/archive/html/bug-make/2017-11/msg00017.html
-clang_prog=$(shell $(SHELL) $(.SHELLFLAGS) "command -v clang")
-clangxx_prog=$(shell $(SHELL) $(.SHELLFLAGS) "command -v clang++")
+clang_prog:=$(shell $(SHELL) $(.SHELLFLAGS) "command -v clang")
+clangxx_prog:=$(shell $(SHELL) $(.SHELLFLAGS) "command -v clang++")
+
+clang_resource_dir:=$(shell $(SHELL) $(.SHELLFLAGS) "$(clang_prog) -print-resource-dir")
 
 darwin_AR=$(shell $(SHELL) $(.SHELLFLAGS) "command -v llvm-ar")
 darwin_DSYMUTIL=$(shell $(SHELL) $(.SHELLFLAGS) "command -v dsymutil")
@@ -51,13 +53,15 @@ darwin_STRIP=$(shell $(SHELL) $(.SHELLFLAGS) "command -v llvm-strip")
 #         Disable adhoc codesigning (for now) when using LLVM tooling, to avoid
 #         non-determinism issues with the Identifier field.
 
-darwin_CC=$(clang_prog) --target=$(host) \
-              -isysroot$(OSX_SDK) -nostdlibinc \
+darwin_CC=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH $(clang_prog) --target=$(host) \
+              -isysroot$(OSX_SDK) -nostdinc \
+              -isystem$(clang_resource_dir)/include \
               -iwithsysroot/usr/include -iframeworkwithsysroot/System/Library/Frameworks
 
-darwin_CXX=$(clangxx_prog) --target=$(host) \
-               -isysroot$(OSX_SDK) -nostdlibinc \
+darwin_CXX=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH $(clangxx_prog) --target=$(host) \
+               -isysroot$(OSX_SDK) -nostdinc -nostdinc++ \
                -iwithsysroot/usr/include/c++/v1 \
+               -isystem$(clang_resource_dir)/include \
                -iwithsysroot/usr/include -iframeworkwithsysroot/System/Library/Frameworks
 
 darwin_CFLAGS=-pipe -std=$(C_STANDARD) -mmacos-version-min=$(OSX_MIN_VERSION)