diff --git a/.buildkite/pipelines/build_linux.json.py b/.buildkite/pipelines/build_linux.json.py
index 3178391fb..c9443a17d 100755
--- a/.buildkite/pipelines/build_linux.json.py
+++ b/.buildkite/pipelines/build_linux.json.py
@@ -36,7 +36,7 @@
       "cpu": "6",
       "ephemeralStorage": "20G",
       "memory": "64G",
-      "image": os.getenv("DOCKER_IMAGE", "docker.elastic.co/ml-dev/ml-linux-build:32")
+      "image": os.getenv("DOCKER_IMAGE", "docker.elastic.co/ml-dev/ml-linux-build:32a")
    },
    "aarch64": {
       "provider": "aws",
@@ -101,7 +101,7 @@ def main(args):
               "cpu": "6",
               "ephemeralStorage": "20G",
               "memory": "64G",
-              "image": "docker.elastic.co/ml-dev/ml-linux-aarch64-cross-build:15"
+              "image": "docker.elastic.co/ml-dev/ml-linux-aarch64-cross-build:15a"
             },
             "commands": [
               ".buildkite/scripts/steps/build_and_test.sh"
diff --git a/3rd_party/licenses/pytorch-INFO.csv b/3rd_party/licenses/pytorch-INFO.csv
index 6750bd122..04bd473a0 100644
--- a/3rd_party/licenses/pytorch-INFO.csv
+++ b/3rd_party/licenses/pytorch-INFO.csv
@@ -1,2 +1,2 @@
 name,version,revision,url,license,copyright,sourceURL
-PyTorch,2.5.1,a8d6afb511a69687bbb2b7e88a3cf67917e1697e,https://pytorch.org,BSD-3-Clause,,
+PyTorch,2.7.1,e2d141dbde55c2a4370fac5165b0561b6af4798b,https://pytorch.org,BSD-3-Clause,,
diff --git a/build-setup/linux.md b/build-setup/linux.md
index adcc5d1a0..22c241a6e 100644
--- a/build-setup/linux.md
+++ b/build-setup/linux.md
@@ -329,7 +329,7 @@ Then copy the shared libraries to the system directory:
 (cd /opt/intel/oneapi/mkl/2024.0 && tar cf - lib) | (cd /usr/local/gcc103 && sudo tar xvf -)
 ```
 
-### PyTorch 2.5.1
+### PyTorch 2.7.1
 
 (This step requires a reasonable amount of memory. It failed on a machine with 8GB of RAM. It succeeded on a 16GB machine. You can specify the number of parallel jobs using environment variable MAX_JOBS. Lower number of jobs will reduce memory usage.)
 
@@ -348,7 +348,7 @@ sudo /usr/local/gcc103/bin/python3.10 -m pip install install numpy pyyaml setupt
 Then obtain the PyTorch code:
 
 ```
-git clone --depth=1 --branch=v2.5.1 git@github.com:pytorch/pytorch.git
+git clone --depth=1 --branch=v2.7.1 git@github.com:pytorch/pytorch.git
 cd pytorch
 git submodule sync
 git submodule update --init --recursive
@@ -383,7 +383,7 @@ export USE_MKLDNN=ON
 export USE_QNNPACK=OFF
 export USE_PYTORCH_QNNPACK=OFF
 [ $(uname -m) = x86_64 ] && export USE_XNNPACK=OFF
-export PYTORCH_BUILD_VERSION=2.5.1
+export PYTORCH_BUILD_VERSION=2.7.1
 export PYTORCH_BUILD_NUMBER=1
 /usr/local/gcc103/bin/python3.10 setup.py install
 ```
diff --git a/build-setup/macos.md b/build-setup/macos.md
index 6f6b2afae..b2441b9ae 100644
--- a/build-setup/macos.md
+++ b/build-setup/macos.md
@@ -127,7 +127,7 @@ Download the graphical installer for Python 3.10.9 from <https://www.python.org/
 
 Install using all the default options.  When the installer completes a Finder window pops up.  Double click the `Install Certificates.command` file in this folder to install the SSL certificates Python needs.
 
-### PyTorch 2.5.1
+### PyTorch 2.7.1
 
 PyTorch requires that certain Python modules are installed.  To install them:
 
@@ -138,7 +138,7 @@ sudo /Library/Frameworks/Python.framework/Versions/3.10/bin/pip3.10 install nump
 Then obtain the PyTorch code:
 
 ```
-git clone --depth=1 --branch=v2.5.1 https://github.com/pytorch/pytorch.git
+git clone --depth=1 --branch=v2.7.1 https://github.com/pytorch/pytorch.git
 cd pytorch
 git submodule sync
 git submodule update --init --recursive
@@ -252,7 +252,7 @@ export DNNL_TARGET_ARCH=AARCH64
 export USE_MKLDNN=ON
 export USE_QNNPACK=OFF
 export USE_PYTORCH_QNNPACK=OFF
-export PYTORCH_BUILD_VERSION=2.5.1
+export PYTORCH_BUILD_VERSION=2.7.1
 export PYTORCH_BUILD_NUMBER=1
 /Library/Frameworks/Python.framework/Versions/3.10/bin/python3.10 setup.py install
 ```
diff --git a/build-setup/windows.md b/build-setup/windows.md
index f08820e9e..9acc90e8b 100644
--- a/build-setup/windows.md
+++ b/build-setup/windows.md
@@ -193,7 +193,7 @@ On the "Advanced Options" screen, check "Install for all users" and "Add Python
 
 For the time being, do not take advantage of the option on the final installer screen to reconfigure the machine to allow paths longer than 260 characters.  We still support Windows versions that do not have this option.
 
-### PyTorch 2.5.1
+### PyTorch 2.7.1
 
 (This step requires a lot of memory. It failed on a machine with 12GB of RAM. It just about fitted on a 20GB machine. 32GB RAM is recommended.)
 
@@ -209,7 +209,7 @@ Next, in a Git bash shell run:
 
 ```
 cd /c/tools
-git clone --depth=1 --branch=v2.5.1 https://github.com/pytorch/pytorch.git
+git clone --depth=1 --branch=v2.7.1 https://github.com/pytorch/pytorch.git
 cd pytorch
 git submodule sync
 git submodule update --init --recursive
@@ -265,7 +265,7 @@ set USE_QNNPACK=OFF
 set USE_PYTORCH_QNNPACK=OFF
 set USE_XNNPACK=OFF
 set MSVC_Z7_OVERRIDE=OFF
-set PYTORCH_BUILD_VERSION=2.5.1
+set PYTORCH_BUILD_VERSION=2.7.1
 set PYTORCH_BUILD_NUMBER=1
 python setup.py install
 ```
diff --git a/dev-tools/docker/README.md b/dev-tools/docker/README.md
index 89314f61c..3cc1d7157 100644
--- a/dev-tools/docker/README.md
+++ b/dev-tools/docker/README.md
@@ -36,7 +36,7 @@ required to build the machine learning C++ code dependencies:
 2. Change the Dockerfile and build a new image to be used for subsequent builds on this branch.
 3. Update the version to be used for builds in docker files that refer to it.
 
-### Depends on: ml-linux-build:32
+### Depends on: ml-linux-build:32a
 
 ### Build script: dev-tools/docker/build_linux_dependency_builder_image.sh
 
@@ -44,7 +44,7 @@ required to build the machine learning C++ code dependencies:
 
 ## Repository: ml-linux-build
 
-### Latest version: 32
+### Latest version: 32a
 
 ### Comments
 A Docker image that can be used to compile the machine learning
@@ -63,7 +63,7 @@ used for subsequent builds on this branch.
 
 ## Repository: ml-linux-aarch64-cross-build
 
-### Latest version: 15
+### Latest version: 15a
 
 ### Comments
 A Docker image that can be used to compile the machine learning
@@ -82,7 +82,7 @@ used for subsequent builds on this branch.
 
 ## Repository: ml-linux-aarch64-native-build
 
-### Latest version: 15
+### Latest version: 15a
 
 ### Comments
 A Docker image that can be used to compile the machine learning
diff --git a/dev-tools/docker/build_linux_aarch64_cross_build_image.sh b/dev-tools/docker/build_linux_aarch64_cross_build_image.sh
index 4289d1c72..bce1fb799 100755
--- a/dev-tools/docker/build_linux_aarch64_cross_build_image.sh
+++ b/dev-tools/docker/build_linux_aarch64_cross_build_image.sh
@@ -22,7 +22,7 @@
 HOST=docker.elastic.co
 ACCOUNT=ml-dev
 REPOSITORY=ml-linux-aarch64-cross-build
-VERSION=15
+VERSION=15a
 
 set -e
 
diff --git a/dev-tools/docker/build_linux_aarch64_native_build_image.sh b/dev-tools/docker/build_linux_aarch64_native_build_image.sh
index d18bd70ff..72271848c 100755
--- a/dev-tools/docker/build_linux_aarch64_native_build_image.sh
+++ b/dev-tools/docker/build_linux_aarch64_native_build_image.sh
@@ -34,7 +34,7 @@ sleep 5
 HOST=docker.elastic.co
 ACCOUNT=ml-dev
 REPOSITORY=ml-linux-aarch64-native-build
-VERSION=13
+VERSION=15a
 
 set -e
 
diff --git a/dev-tools/docker/build_linux_build_image.sh b/dev-tools/docker/build_linux_build_image.sh
index a74f5eefe..09b6874dc 100755
--- a/dev-tools/docker/build_linux_build_image.sh
+++ b/dev-tools/docker/build_linux_build_image.sh
@@ -34,7 +34,7 @@ sleep 5
 HOST=docker.elastic.co
 ACCOUNT=ml-dev
 REPOSITORY=ml-linux-build
-VERSION=30
+VERSION=32a
 
 set -e
 
diff --git a/dev-tools/docker/linux_aarch64_cross_builder/Dockerfile b/dev-tools/docker/linux_aarch64_cross_builder/Dockerfile
index 4169c321a..4ebcf3cfe 100644
--- a/dev-tools/docker/linux_aarch64_cross_builder/Dockerfile
+++ b/dev-tools/docker/linux_aarch64_cross_builder/Dockerfile
@@ -10,7 +10,7 @@
 #
 
 # Increment the version here when a new tools/3rd party components image is built
-FROM docker.elastic.co/ml-dev/ml-linux-aarch64-cross-build:15
+FROM docker.elastic.co/ml-dev/ml-linux-aarch64-cross-build:15a
 
 MAINTAINER David Roberts <dave.roberts@elastic.co>
 
diff --git a/dev-tools/docker/linux_aarch64_cross_image/Dockerfile b/dev-tools/docker/linux_aarch64_cross_image/Dockerfile
index 20559d1bb..4a8944f25 100644
--- a/dev-tools/docker/linux_aarch64_cross_image/Dockerfile
+++ b/dev-tools/docker/linux_aarch64_cross_image/Dockerfile
@@ -27,7 +27,7 @@ RUN \
 RUN \
   mkdir -p /usr/local/sysroot-aarch64-linux-gnu/usr && \
   cd /usr/local/sysroot-aarch64-linux-gnu/usr && \
-  wget --quiet -O - https://s3-eu-west-2.amazonaws.com/ml-cpp-artifacts/dependencies/usr-aarch64-linux-gnu-15.tar.bz2 | tar jxf - && \
+  wget --quiet -O - https://s3-eu-west-2.amazonaws.com/ml-cpp-artifacts/dependencies/usr-aarch64-linux-gnu-15a.tar.bz2 | tar jxf - && \
   cd .. && \
   ln -s usr/lib lib && \
   ln -s usr/lib64 lib64
diff --git a/dev-tools/docker/linux_aarch64_native_builder/Dockerfile b/dev-tools/docker/linux_aarch64_native_builder/Dockerfile
index ec326a475..97a960a30 100644
--- a/dev-tools/docker/linux_aarch64_native_builder/Dockerfile
+++ b/dev-tools/docker/linux_aarch64_native_builder/Dockerfile
@@ -10,7 +10,7 @@
 #
 
 # Increment the version here when a new tools/3rd party components image is built
-FROM docker.elastic.co/ml-dev/ml-linux-aarch64-native-build:15
+FROM docker.elastic.co/ml-dev/ml-linux-aarch64-native-build:15a
 
 MAINTAINER David Roberts <dave.roberts@elastic.co>
 
diff --git a/dev-tools/docker/linux_aarch64_native_image/Dockerfile b/dev-tools/docker/linux_aarch64_native_image/Dockerfile
index 7f533f224..6dcb50696 100644
--- a/dev-tools/docker/linux_aarch64_native_image/Dockerfile
+++ b/dev-tools/docker/linux_aarch64_native_image/Dockerfile
@@ -35,7 +35,7 @@ ARG build_dir=/usr/src
 # Build gcc 10.3
 RUN \
   cd ${build_dir} && \
-  wget --quiet -O - http://ftpmirror.gnu.org/gcc/gcc-10.3.0/gcc-10.3.0.tar.gz | tar zxf - && \
+  wget --quiet -O - https://mirrorservice.org/sites/sourceware.org/pub/gcc/releases/gcc-10.3.0/gcc-10.3.0.tar.gz | tar zxf - && \
   cd gcc-10.3.0 && \
   contrib/download_prerequisites && \
   sed -i -e 's/$(SHLIB_LDFLAGS)/-Wl,-z,relro -Wl,-z,now $(SHLIB_LDFLAGS)/' libgcc/config/t-slibgcc && \
@@ -141,7 +141,7 @@ RUN \
 # If the PyTorch branch is changed also update PYTORCH_BUILD_VERSION
 RUN \
   cd ${build_dir} && \
-  git -c advice.detachedHead=false clone --depth=1 --branch=v2.5.1 https://github.com/pytorch/pytorch.git && \
+  git -c advice.detachedHead=false clone --depth=1 --branch=v2.7.1 https://github.com/pytorch/pytorch.git && \
   cd pytorch && \
   git submodule sync && \
   git submodule update --init --recursive && \
@@ -155,7 +155,7 @@ RUN \
   export USE_MKLDNN=ON && \
   export USE_QNNPACK=OFF && \
   export USE_PYTORCH_QNNPACK=OFF && \
-  export PYTORCH_BUILD_VERSION=2.5.1 && \
+  export PYTORCH_BUILD_VERSION=2.7.1 && \
   export PYTORCH_BUILD_NUMBER=1 && \
   /usr/local/bin/python3.10 setup.py install && \
   mkdir /usr/local/gcc103/include/pytorch && \
diff --git a/dev-tools/docker/linux_aarch64_native_tester/Dockerfile b/dev-tools/docker/linux_aarch64_native_tester/Dockerfile
index 3cccfbfc3..eb3d55804 100644
--- a/dev-tools/docker/linux_aarch64_native_tester/Dockerfile
+++ b/dev-tools/docker/linux_aarch64_native_tester/Dockerfile
@@ -10,7 +10,7 @@
 #
 
 # Increment the version here when a new tools/3rd party components image is built
-FROM docker.elastic.co/ml-dev/ml-linux-aarch64-native-build:15
+FROM docker.elastic.co/ml-dev/ml-linux-aarch64-native-build:15a
 
 MAINTAINER David Roberts <dave.roberts@elastic.co>
 
diff --git a/dev-tools/docker/linux_builder/Dockerfile b/dev-tools/docker/linux_builder/Dockerfile
index f9f2ecdc0..d484c80b5 100644
--- a/dev-tools/docker/linux_builder/Dockerfile
+++ b/dev-tools/docker/linux_builder/Dockerfile
@@ -10,7 +10,7 @@
 #
 
 # Increment the version here when a new tools/3rd party components image is built
-FROM docker.elastic.co/ml-dev/ml-linux-build:32
+FROM docker.elastic.co/ml-dev/ml-linux-build:32a
 
 MAINTAINER David Roberts <dave.roberts@elastic.co>
 
diff --git a/dev-tools/docker/linux_dependency_builder_image/Dockerfile b/dev-tools/docker/linux_dependency_builder_image/Dockerfile
index 33defeecc..9d2819c2f 100644
--- a/dev-tools/docker/linux_dependency_builder_image/Dockerfile
+++ b/dev-tools/docker/linux_dependency_builder_image/Dockerfile
@@ -10,7 +10,7 @@
 #
 
 # Increment the version here when a new tools/3rd party components image is built
-FROM docker.elastic.co/ml-dev/ml-linux-build:32 AS builder
+FROM docker.elastic.co/ml-dev/ml-linux-build:32a AS builder
 
 # This is basically automating the setup instructions in build-setup/linux.md
 
diff --git a/dev-tools/docker/linux_image/Dockerfile b/dev-tools/docker/linux_image/Dockerfile
index 65ba95877..4f876b4ad 100644
--- a/dev-tools/docker/linux_image/Dockerfile
+++ b/dev-tools/docker/linux_image/Dockerfile
@@ -35,7 +35,7 @@ ARG build_dir=/usr/src
 # Build gcc 10.3
 RUN \
   cd ${build_dir} && \
-  wget --quiet -O - http://ftpmirror.gnu.org/gcc/gcc-10.3.0/gcc-10.3.0.tar.gz | tar zxf - && \
+  wget --quiet -O - https://mirrorservice.org/sites/sourceware.org/pub/gcc/releases/gcc-10.3.0/gcc-10.3.0.tar.gz | tar zxf - && \
   cd gcc-10.3.0 && \
   contrib/download_prerequisites && \
   sed -i -e 's/$(SHLIB_LDFLAGS)/-Wl,-z,relro -Wl,-z,now $(SHLIB_LDFLAGS)/' libgcc/config/t-slibgcc && \
@@ -154,7 +154,7 @@ gpgkey=https://yum.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS.
 # If the PyTorch branch is changed also update PYTORCH_BUILD_VERSION
 RUN \
   cd ${build_dir} && \
-  git -c advice.detachedHead=false clone --depth=1 --branch=v2.5.1 https://github.com/pytorch/pytorch.git && \
+  git -c advice.detachedHead=false clone --depth=1 --branch=v2.7.1 https://github.com/pytorch/pytorch.git && \
   cd pytorch && \
   git submodule sync && \
   git submodule update --init --recursive && \
@@ -169,7 +169,7 @@ RUN \
   export USE_QNNPACK=OFF && \
   export USE_PYTORCH_QNNPACK=OFF && \
   export USE_XNNPACK=OFF && \
-  export PYTORCH_BUILD_VERSION=2.5.1 && \
+  export PYTORCH_BUILD_VERSION=2.7.1 && \
   export PYTORCH_BUILD_NUMBER=1 && \
   export MAX_JOBS=10 && \
   /usr/local/bin/python3.10 setup.py install && \
diff --git a/dev-tools/docker/linux_tester/Dockerfile b/dev-tools/docker/linux_tester/Dockerfile
index 8c7f6c6eb..d4e7845e6 100644
--- a/dev-tools/docker/linux_tester/Dockerfile
+++ b/dev-tools/docker/linux_tester/Dockerfile
@@ -10,7 +10,7 @@
 #
 
 # Increment the version here when a new tools/3rd party components image is built
-FROM docker.elastic.co/ml-dev/ml-linux-build:32
+FROM docker.elastic.co/ml-dev/ml-linux-build:32a
 
 MAINTAINER David Roberts <dave.roberts@elastic.co>
 
diff --git a/dev-tools/download_macos_deps.sh b/dev-tools/download_macos_deps.sh
index 0b7294fda..3ac2cabfa 100755
--- a/dev-tools/download_macos_deps.sh
+++ b/dev-tools/download_macos_deps.sh
@@ -28,7 +28,7 @@ case `uname -m` in
         ARCHIVE=local-x86_64-apple-macosx12.0-1.tar.bz2
         ;;
     arm64)
-        ARCHIVE=local-arm64-apple-macosx11.1-12.tar.bz2
+        ARCHIVE=local-arm64-apple-macosx12.2-1.tar.bz2
         ;;
 
     *)
@@ -38,7 +38,7 @@ case `uname -m` in
 
 esac
 
-URL="https://s3-eu-west-2.amazonaws.com/ml-cpp-artifacts/dependencies/$ARCHIVE"
+URL="https://ml-cpp-artifacts.s3.eu-west-2.amazonaws.com/dependencies/$ARCHIVE"
 
 echo "Downloading dependencies from $URL"
 cd "$TMPDIR" && curl -s -S --retry 5 -O "$URL"
diff --git a/dev-tools/download_windows_deps.ps1 b/dev-tools/download_windows_deps.ps1
index dbda28994..c0747a428 100755
--- a/dev-tools/download_windows_deps.ps1
+++ b/dev-tools/download_windows_deps.ps1
@@ -9,11 +9,13 @@
 # limitation.
 #
 $ErrorActionPreference="Stop"
+# TODO: Fix the windows build and use the latest archive
+# $Archive="usr-x86_64-windows-2016-16.zip"
 $Archive="usr-x86_64-windows-2016-15.zip"
 $Destination="C:\"
-# If PyTorch is not version 2.5.1 then we need the latest download
+# If PyTorch is not version 2.7.1 then we need the latest download
 if (!(Test-Path "$Destination\usr\local\include\pytorch\torch\csrc\api\include\torch\version.h") -Or
-    !(Select-String -Path "$Destination\usr\local\include\pytorch\torch\csrc\api\include\torch\version.h" -Pattern "2.5.1" -Quiet)) {
+    !(Select-String -Path "$Destination\usr\local\include\pytorch\torch\csrc\api\include\torch\version.h" -Pattern "2.7.1" -Quiet)) {
     Remove-Item "$Destination\usr" -Recurse -Force -ErrorAction Ignore
     $ZipSource="https://storage.googleapis.com/elastic-ml-public/dependencies/$Archive"
     $ZipDestination="$Env:TEMP\$Archive"
diff --git a/docs/CHANGELOG.asciidoc b/docs/CHANGELOG.asciidoc
index a77ed44de..7abf9bbed 100644
--- a/docs/CHANGELOG.asciidoc
+++ b/docs/CHANGELOG.asciidoc
@@ -28,6 +28,12 @@
 
 //=== Regressions
 
+== {es} version 8.19.8
+
+=== Enhancements
+
+* Update the PyTorch library to version 2.7.1. (See {ml-pull}2882[#2882].)
+
 == {es} version 8.19.0
 
 === Enhancements