diff --git a/ci/test/00_setup_env.sh b/ci/test/00_setup_env.sh
index 626394cb5d7b..4207615a1a94 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=${SDK_URL:-https://s3.us-west-2.amazonaws.com/dash-depends-sources}
+export SDK_URL=${SDK_URL:-https://bitcoincore.org/depends-sources/sdks}
 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_mac.sh b/ci/test/00_setup_env_mac.sh
index 244ec7138044..1c1a738e107d 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=16.0
-export XCODE_BUILD_ID=16A242d
+export PACKAGES="clang cmake lld llvm  zip"
+export XCODE_VERSION=26.1.1
+export XCODE_BUILD_ID=17B100
 export RUN_UNIT_TESTS=false
 export RUN_FUNCTIONAL_TESTS=false
 export GOAL="all deploy"
diff --git a/contrib/containers/guix/scripts/setup-sdk b/contrib/containers/guix/scripts/setup-sdk
index 8034fa63d581..1dd8e6dc4597 100755
--- a/contrib/containers/guix/scripts/setup-sdk
+++ b/contrib/containers/guix/scripts/setup-sdk
@@ -7,24 +7,25 @@ export LC_ALL=C.UTF-8
 
 set -eo pipefail
 
-SDK_URL="${SDK_URL:-https://s3.us-west-2.amazonaws.com/dash-depends-sources}"
+SDK_URL="${SDK_URL:-https://bitcoincore.org/depends-sources/sdks}"
 SDK_PATH="${SDK_PATH:-depends/SDKs}"
 SDK_SOURCES="${SDK_SOURCES:-depends/sdk-sources}"
-XCODE_VERSION="${XCODE_VERSION:-16.0}"
-XCODE_RELEASE="${XCODE_RELEASE:-16A242d}"
+XCODE_VERSION="${XCODE_VERSION:-26.1.1}"
+XCODE_RELEASE="${XCODE_RELEASE:-17B100}"
 XCODE_ARCHIVE="Xcode-${XCODE_VERSION}-${XCODE_RELEASE}-extracted-SDK-with-libcxx-headers"
-XCODE_AR_HASH="${XCODE_AR_HASH:-bce59aa16560f182e44200a0b9539bd637c8b5c7089fbff13b0712730ce162ff}"
-XCODE_AR_PATH="${SDK_SOURCES}/${XCODE_ARCHIVE}.tar.gz"
+XCODE_AR_HASH="${XCODE_AR_HASH:-9600fa93644df674ee916b5e2c8a6ba8dacf631996a65dc922d003b98b5ea3b1}"
+XCODE_AR_PATH="${SDK_SOURCES}/${XCODE_ARCHIVE}.tar"
 
 if [ ! -d "${SDK_PATH}/${XCODE_ARCHIVE}" ]; then
     if [ ! -f "${XCODE_AR_PATH}" ]; then
         echo "Downloading macOS SDK..."
         mkdir -p "${SDK_SOURCES}"
-        curl --location --fail "${SDK_URL}/${XCODE_ARCHIVE}.tar.gz" -o "${XCODE_AR_PATH}"
+        curl --location --fail "${SDK_URL}/${XCODE_ARCHIVE}.tar" -o "${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 ${XCODE_AR_PATH}"
+        sha256sum "${XCODE_AR_PATH}"
         exit 1
     fi
     echo "Extracting macOS SDK..."
diff --git a/contrib/guix/README.md b/contrib/guix/README.md
index 366ba7dfc951..cb7eb134a2e6 100644
--- a/contrib/guix/README.md
+++ b/contrib/guix/README.md
@@ -37,7 +37,7 @@ You can then either point to the SDK using the `SDK_PATH` environment variable:
 
 ```sh
 # Extract the SDK tarball to /path/to/parent/dir/of/extracted/SDK/Xcode-<foo>-<bar>-extracted-SDK-with-libcxx-headers
-tar -C /path/to/parent/dir/of/extracted/SDK -xaf /path/to/Xcode-<foo>-<bar>-extracted-SDK-with-libcxx-headers.tar.gz
+tar -C /path/to/parent/dir/of/extracted/SDK -xaf /path/to/Xcode-<foo>-<bar>-extracted-SDK-with-libcxx-headers.tar
 
 # Indicate where to locate the SDK tarball
 export SDK_PATH=/path/to/parent/dir/of/extracted/SDK
@@ -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-16.0-16A242d-extracted-SDK-with-libcxx-headers`).
+  `$HOME/Downloads/macOS-SDKs/Xcode-26.1.1-17B100-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 b2dc20cb5266..bca9029b24d8 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 == [15, 0, 0]:
+    if binary.build_version.sdk == [14, 0, 0]:
         return True
     return False
 
diff --git a/contrib/macdeploy/README.md b/contrib/macdeploy/README.md
index 86d122f6dfae..addfe5891358 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_16.xip](https://download.developer.apple.com/Developer_Tools/Xcode_16/Xcode_16.xip).
+[Xcode_26.1.1_Apple_silicon.xip](https://download.developer.apple.com/Developer_Tools/Xcode_26.1.1/Xcode_26.1.1_Apple_silicon.xip).
 
 Alternatively, after logging in to your account go to 'Downloads', then 'More'
-and search for [`Xcode 16`](https://developer.apple.com/download/all/?q=Xcode%2016).
+and search for [`Xcode 26.1.1`](https://developer.apple.com/download/all/?q=Xcode%2026.1.1).
 
 An Apple ID and cookies enabled for the hostname are needed to download this.
 
-The `sha256sum` of the downloaded XIP archive should be `4a26c3d102a55c7222fb145e0ee1503249c9c26c6e02dc64d783c8810b37b1e3`.
+The `sha256sum` of the downloaded XIP archive should be `f4c65b01e2807372b61553c71036dbfef492d7c79d4c380a5afb61aa1018e555`.
 
 To extract the `.xip` on Linux:
 
@@ -33,26 +33,26 @@ 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_16.xip | cpio -d -i
+python3 apple-sdk-tools/extract_xcode.py -f Xcode_26.1.1_Apple_silicon.xip | cpio -d -i
 ```
 
 On macOS:
 
 ```bash
-xip -x Xcode_16.xip
+xip -x Xcode_26.1.1_Apple_silicon.xip
 ```
 
 ### Step 2: Generating the SDK tarball from `Xcode.app`
 
-To generate the SDK, run the script [`gen-sdk`](./gen-sdk) with the
+To generate the SDK, run the script [`gen-sdk.py`](./gen-sdk.py) with the
 path to `Xcode.app` (extracted in the previous stage) as the first argument.
 
 ```bash
-./contrib/macdeploy/gen-sdk '/path/to/Xcode.app'
+./contrib/macdeploy/gen-sdk.py '/path/to/Xcode.app'
 ```
 
-The generated archive should be: `Xcode-16.0-16A242d-extracted-SDK-with-libcxx-headers.tar.gz`.
-The `sha256sum` should be `bce59aa16560f182e44200a0b9539bd637c8b5c7089fbff13b0712730ce162ff`.
+The generated archive should be: `Xcode-26.1.1-17B100-extracted-SDK-with-libcxx-headers.tar`.
+The `sha256sum` should be `9600fa93644df674ee916b5e2c8a6ba8dacf631996a65dc922d003b98b5ea3b1`.
 
 ## Deterministic macOS App Notes
 
diff --git a/contrib/macdeploy/gen-sdk b/contrib/macdeploy/gen-sdk.py
similarity index 74%
rename from contrib/macdeploy/gen-sdk
rename to contrib/macdeploy/gen-sdk.py
index 86a6262b5ce4..d92da060359c 100755
--- a/contrib/macdeploy/gen-sdk
+++ b/contrib/macdeploy/gen-sdk.py
@@ -2,9 +2,7 @@
 import argparse
 import plistlib
 import pathlib
-import sys
 import tarfile
-import gzip
 import os
 import contextlib
 
@@ -22,12 +20,12 @@ def run():
     parser = argparse.ArgumentParser(
         description=__doc__, formatter_class=argparse.RawTextHelpFormatter)
 
-    parser.add_argument('xcode_app', metavar='XCODEAPP', nargs=1)
-    parser.add_argument("-o", metavar='OUTSDKTGZ', nargs=1, dest='out_sdktgz', required=False)
+    parser.add_argument('xcode_app', metavar='XCODEAPP', type=pathlib.Path)
+    parser.add_argument("-o", metavar='OUTSDKTAR', dest='out_sdkt', type=pathlib.Path, required=False)
 
     args = parser.parse_args()
 
-    xcode_app = pathlib.Path(args.xcode_app[0]).resolve()
+    xcode_app = args.xcode_app.resolve()
     assert xcode_app.is_dir(), "The supplied Xcode.app path '{}' either does not exist or is not a directory".format(xcode_app)
 
     xcode_app_plist = xcode_app.joinpath("Contents/version.plist")
@@ -47,11 +45,7 @@ def run():
 
     out_name = "Xcode-{xcode_version}-{xcode_build_id}-extracted-SDK-with-libcxx-headers".format(xcode_version=xcode_version, xcode_build_id=xcode_build_id)
 
-    if args.out_sdktgz:
-        out_sdktgz_path = pathlib.Path(args.out_sdktgz_path)
-    else:
-        # Construct our own out_sdktgz if not specified on the command line
-        out_sdktgz_path = pathlib.Path("./{}.tar.gz".format(out_name))
+    out_sdkt_path = args.out_sdkt or pathlib.Path("./{}.tar".format(out_name))
 
     def tarfp_add_with_base_change(tarfp, dir_to_add, alt_base_dir):
         """Add all files in dir_to_add to tarfp, but prepent alt_base_dir to the files'
@@ -68,6 +62,8 @@ def tarfp_add_with_base_change(tarfp, dir_to_add, alt_base_dir):
 
         """
         def change_tarinfo_base(tarinfo):
+            if tarinfo.name and tarinfo.name.endswith((".swiftmodule", ".modulemap")):
+                return None
             if tarinfo.name and tarinfo.name.startswith("./"):
                 tarinfo.name = str(pathlib.Path(alt_base_dir, tarinfo.name))
             if tarinfo.linkname and tarinfo.linkname.startswith("./"):
@@ -81,16 +77,17 @@ def change_tarinfo_base(tarinfo):
             return tarinfo
         with cd(dir_to_add):
             # recursion already adds entries in sorted order
-            tarfp.add(".", recursive=True, filter=change_tarinfo_base)
-
-    print("Creating output .tar.gz file...")
-    with out_sdktgz_path.open("wb") as fp:
-        with gzip.GzipFile(fileobj=fp, mode='wb', compresslevel=9, mtime=0) as gzf:
-            with tarfile.open(mode="w", fileobj=gzf, format=tarfile.GNU_FORMAT) as tarfp:
-                print("Adding MacOSX SDK {} files...".format(sdk_version))
-                tarfp_add_with_base_change(tarfp, sdk_dir, out_name)
-    print("Done! Find the resulting gzipped tarball at:")
-    print(out_sdktgz_path.resolve())
+            tarfp.add("./usr/include", recursive=True, filter=change_tarinfo_base)
+            tarfp.add("./usr/lib", recursive=True, filter=change_tarinfo_base)
+            tarfp.add("./System/Library/Frameworks", recursive=True, filter=change_tarinfo_base)
+
+    print("Creating output .tar file...")
+    with out_sdkt_path.open("wb") as fp:
+        with tarfile.open(mode="w", fileobj=fp, format=tarfile.PAX_FORMAT) as tarfp:
+            print("Adding MacOSX SDK {} files...".format(sdk_version))
+            tarfp_add_with_base_change(tarfp, sdk_dir, out_name)
+    print("Done! Find the resulting tarball at:")
+    print(out_sdkt_path.resolve())
 
 if __name__ == '__main__':
     run()
diff --git a/depends/funcs.mk b/depends/funcs.mk
index ec514600b7fb..566f83a9868e 100644
--- a/depends/funcs.mk
+++ b/depends/funcs.mk
@@ -8,9 +8,11 @@ $(1)_ar=$$($$($(1)_type)_AR)
 $(1)_ranlib=$$($$($(1)_type)_RANLIB)
 $(1)_nm=$$($$($(1)_type)_NM)
 $(1)_cflags=$$($$($(1)_type)_CFLAGS) \
-            $$($$($(1)_type)_$$(release_type)_CFLAGS)
+            $$($$($(1)_type)_$$(release_type)_CFLAGS) \
+            -pipe -std=$(C_STANDARD)
 $(1)_cxxflags=$$($$($(1)_type)_CXXFLAGS) \
-              $$($$($(1)_type)_$$(release_type)_CXXFLAGS)
+              $$($$($(1)_type)_$$(release_type)_CXXFLAGS) \
+              -pipe -std=$(CXX_STANDARD)
 $(1)_ldflags=$$($$($(1)_type)_LDFLAGS) \
              $$($$($(1)_type)_$$(release_type)_LDFLAGS) \
              -L$$($($(1)_type)_prefix)/lib
diff --git a/depends/hosts/darwin.mk b/depends/hosts/darwin.mk
index eb5e3d15b3d7..977931c14855 100644
--- a/depends/hosts/darwin.mk
+++ b/depends/hosts/darwin.mk
@@ -1,7 +1,7 @@
 OSX_MIN_VERSION=14.0
-OSX_SDK_VERSION=15.0
-XCODE_VERSION=16.0
-XCODE_BUILD_ID=16A242d
+OSX_SDK_VERSION=14.0
+XCODE_VERSION=26.1.1
+XCODE_BUILD_ID=17B100
 LLD_VERSION=711
 
 OSX_SDK=$(SDK_PATH)/Xcode-$(XCODE_VERSION)-$(XCODE_BUILD_ID)-extracted-SDK-with-libcxx-headers
@@ -13,10 +13,8 @@ OSX_SDK=$(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) $(.SHELLFLAGS) "command -v clang++")
-
-clang_resource_dir:=$(shell $(SHELL) $(.SHELLFLAGS) "$(clang_prog) -print-resource-dir")
+clang_prog=$(shell $(SHELL) $(.SHELLFLAGS) "command -v clang")
+clangxx_prog=$(shell $(SHELL) $(.SHELLFLAGS) "command -v clang++")
 
 darwin_AR=$(shell $(SHELL) $(.SHELLFLAGS) "command -v llvm-ar")
 darwin_DSYMUTIL=$(shell $(SHELL) $(.SHELLFLAGS) "command -v dsymutil")
@@ -52,20 +50,28 @@ darwin_STRIP=$(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.
+#
+#     -Xclang -fno-cxx-modules
+#
+#         Disable C++ modules. We don't use these, and modules cause definition issues
+#         in the SDK, where __has_feature(modules) is used to define USE_CLANG_TYPES,
+#         which is in turn used as an include guard.
 
+# TODO: remove C_INCLUDE_PATH when it is indeed useless
+# https://github.com/bitcoin/bitcoin/pull/30451 has been partiall reverted in #7184 and should be re-applied
 darwin_CC=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH $(clang_prog) --target=$(host) \
-              -isysroot$(OSX_SDK) -nostdinc \
-              -isystem$(clang_resource_dir)/include \
+              -isysroot$(OSX_SDK) -nostdlibinc \
               -iwithsysroot/usr/include -iframeworkwithsysroot/System/Library/Frameworks
 
+# TODO: remove C_INCLUDE_PATH when it is indeed useless
+# https://github.com/bitcoin/bitcoin/pull/30451 has been partiall reverted in #7184 and should be re-applied
 darwin_CXX=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH $(clangxx_prog) --target=$(host) \
-               -isysroot$(OSX_SDK) -nostdinc -nostdinc++ \
+               -isysroot$(OSX_SDK) -nostdlibinc \
                -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)
-darwin_CXXFLAGS=-pipe -std=$(CXX_STANDARD) -mmacos-version-min=$(OSX_MIN_VERSION)
+darwin_CFLAGS=-mmacos-version-min=$(OSX_MIN_VERSION)
+darwin_CXXFLAGS=-mmacos-version-min=$(OSX_MIN_VERSION) -Xclang -fno-cxx-modules
 darwin_LDFLAGS=-Wl,-platform_version,macos,$(OSX_MIN_VERSION),$(OSX_SDK_VERSION)
 
 ifneq ($(build_os),darwin)
diff --git a/depends/hosts/freebsd.mk b/depends/hosts/freebsd.mk
index 009d215f82f8..b69535cc800e 100644
--- a/depends/hosts/freebsd.mk
+++ b/depends/hosts/freebsd.mk
@@ -1,5 +1,5 @@
-freebsd_CFLAGS=-pipe -std=$(C_STANDARD)
-freebsd_CXXFLAGS=-pipe -std=$(CXX_STANDARD)
+freebsd_CFLAGS=
+freebsd_CXXFLAGS=
 
 freebsd_release_CFLAGS=-O2
 freebsd_release_CXXFLAGS=$(freebsd_release_CFLAGS)
diff --git a/depends/hosts/linux.mk b/depends/hosts/linux.mk
index e2f34265d153..41958f9978be 100644
--- a/depends/hosts/linux.mk
+++ b/depends/hosts/linux.mk
@@ -1,5 +1,5 @@
-linux_CFLAGS=-pipe -std=$(C_STANDARD)
-linux_CXXFLAGS=-pipe -std=$(CXX_STANDARD)
+linux_CFLAGS=
+linux_CXXFLAGS=
 
 ifneq ($(LTO),)
 linux_AR = $(host_toolchain)gcc-ar
diff --git a/depends/hosts/mingw32.mk b/depends/hosts/mingw32.mk
index 48db7fe863dd..d838e40ed4eb 100644
--- a/depends/hosts/mingw32.mk
+++ b/depends/hosts/mingw32.mk
@@ -2,8 +2,8 @@ ifneq ($(shell $(SHELL) $(.SHELLFLAGS) "command -v $(host)-g++-posix"),)
 mingw32_CXX := $(host)-g++-posix
 endif
 
-mingw32_CFLAGS=-pipe -std=$(C_STANDARD)
-mingw32_CXXFLAGS=-pipe -std=$(CXX_STANDARD)
+mingw32_CFLAGS=
+mingw32_CXXFLAGS=
 
 ifneq ($(LTO),)
 mingw32_AR = $(host_toolchain)gcc-ar
diff --git a/depends/hosts/netbsd.mk b/depends/hosts/netbsd.mk
index d2b79f9d5bf3..0e1256c34e89 100644
--- a/depends/hosts/netbsd.mk
+++ b/depends/hosts/netbsd.mk
@@ -1,5 +1,5 @@
-netbsd_CFLAGS=-pipe -std=$(C_STANDARD)
-netbsd_CXXFLAGS=-pipe -std=$(CXX_STANDARD)
+netbsd_CFLAGS=
+netbsd_CXXFLAGS=
 
 ifneq ($(LTO),)
 netbsd_AR = $(host_toolchain)gcc-ar
diff --git a/depends/hosts/openbsd.mk b/depends/hosts/openbsd.mk
index 53595689b62e..5ab3f53eae64 100644
--- a/depends/hosts/openbsd.mk
+++ b/depends/hosts/openbsd.mk
@@ -1,5 +1,5 @@
-openbsd_CFLAGS=-pipe -std=$(C_STANDARD)
-openbsd_CXXFLAGS=-pipe -std=$(CXX_STANDARD)
+openbsd_CFLAGS=
+openbsd_CXXFLAGS=
 
 openbsd_release_CFLAGS=-O2
 openbsd_release_CXXFLAGS=$(openbsd_release_CFLAGS)