diff --git a/contrib/README-patched.md b/contrib/README-patched.md
new file mode 100644
index 0000000..c5911a6
--- /dev/null
+++ b/contrib/README-patched.md
@@ -0,0 +1,33 @@
+Patched Zig release
+-------------------
+
+This file explains how this zig version was created. As of first writing,
+0.10.0-dev.4301+uber1 + https://github.com/ziglang/zig-bootstrap/pull/131
+
+Steps to re-create a patched zig:
+
+```
+$ wget https://github.com/ziglang/zig/pull/13051.patch
+$ git clone https://github.com/ziglang/zig-bootstrap; cd zig-bootstrap
+
+# if https://github.com/ziglang/zig-bootstrap/pull/131 is not merged: patch it.
+
+$ git am --directory=zig ../13051.patch
+
+$ ${EDITOR:-vi} build  # replace the hash with "+uber1" and bump the last number in ZIG_VERSION
+
+$ ./build-and-archive
+```
+
+Recent zig-bootstrap versions require cmake >= 3.19, which is available from
+ubuntu 22.04 (jammy) or debian 12 (bookworm). Otherwise CMAKE will unable to
+"Find the C compiler". A workaround:
+
+    docker run --privileged -v `pwd`:/x -w /x -ti --rm buildpack-deps:bookworm \
+        sh -c 'apt-get update && apt-get install -y cmake && exec ./build-and-archive'
+
+(`--privileged` is necessary because of devpod nuances. You can skip it if you
+don't know what is a devpod.)
+
+`build-and-archive`, this file and 13051.patch should be in the archive where
+you got your patched zig.
diff --git a/contrib/build-and-archive b/contrib/build-and-archive
new file mode 100755
index 0000000..ae4705c
--- /dev/null
+++ b/contrib/build-and-archive
@@ -0,0 +1,56 @@
+#!/bin/bash
+set -xeuo pipefail
+
+zig_version=$(awk -F'"' '/^ZIG_VERSION=/{print $2}' build)
+
+#./build -j$(nproc) x86_64-linux-musl baseline
+#./build -j$(nproc) x86_64-macos-none baseline
+#./build -j$(nproc) aarch64-linux-musl baseline
+#./build -j$(nproc) aarch64-macos-none apple_a14
+#./build -j$(nproc) x86_64-windows-gnu baseline
+
+rm -fr zig-linux-x86_64-${zig_version}
+rm -fr zig-macos-x86_64-${zig_version}
+rm -fr zig-linux-aarch64-${zig_version}
+rm -fr zig-macos-aarch64-${zig_version}
+rm -fr zig-windows-x86_64-${zig_version}
+
+cp -r out/zig-x86_64-linux-musl-baseline zig-linux-x86_64-${zig_version}
+cp -r out/zig-x86_64-macos-none-baseline zig-macos-x86_64-${zig_version}
+cp -r out/zig-aarch64-linux-musl-baseline zig-linux-aarch64-${zig_version}
+cp -r out/zig-aarch64-macos-none-apple_a14 zig-macos-aarch64-${zig_version}
+cp -r out/zig-x86_64-windows-gnu-baseline zig-windows-x86_64-${zig_version}
+
+for os_arch in linux-{x86_64,aarch64} macos-{x86_64,aarch64} windows-x86_64; do
+    if [[ $os_arch == windows-x86_64 ]]; then
+        zig=zig.exe
+    else
+        zig=zig
+    fi
+    mv zig-${os_arch}-${zig_version}/{bin/${zig},}
+    rmdir zig-${os_arch}-${zig_version}/bin
+
+    # copy some clarifying files for future readers
+    mkdir zig-${os_arch}-${zig_version}/patches
+    cp README-patched.md zig-${os_arch}-${zig_version}/patches/README.md
+    cp 13051.patch "$0" zig-${os_arch}-${zig_version}/patches/
+done
+
+# x86_64 should have libs in lib/, rather than in lib/zig/.
+for os in linux macos windows; do
+    mv zig-${os}-x86_64-${zig_version}/{lib,lib2}
+    mv zig-${os}-x86_64-${zig_version}/{lib2/zig,lib}
+    rmdir zig-${os}-x86_64-${zig_version}/lib2
+done
+
+tar cJf zig-linux-x86_64-${zig_version}.tar.xz zig-linux-x86_64-${zig_version}/ &
+tar cJf zig-macos-x86_64-${zig_version}.tar.xz zig-macos-x86_64-${zig_version}/ &
+tar cJf zig-linux-aarch64-${zig_version}.tar.xz zig-linux-aarch64-${zig_version}/ &
+tar cJf zig-macos-aarch64-${zig_version}.tar.xz zig-macos-aarch64-${zig_version}/ &
+
+# 7z is the quickest, so blocking on it first. Then wait for tars to complete.
+7z a zig-windows-x86_64-${zig_version}.zip zig-windows-x86_64-${zig_version}/
+wait %1 %2 %3 %4
+
+sha256sum *.tar.xz *.zip
+ls -l *.tar.xz *.zip
diff --git a/toolchain/defs.bzl b/toolchain/defs.bzl
index f031d62..7ccde3a 100644
--- a/toolchain/defs.bzl
+++ b/toolchain/defs.bzl
@@ -39,14 +39,14 @@ URL_FORMAT_NIGHTLY = "https://ziglang.org/builds/zig-{host_platform}-{version}.{
 # which, as of writing, has been quite reliable.
 URL_FORMAT_JAKSTYS = "https://dl.jakstys.lt/zig/zig-{host_platform}-{version}.{_ext}"
 
-_VERSION = "0.10.0-dev.4166+cae76d829"
+_VERSION = "0.10.0-dev.4301+uber1"
 
 _HOST_PLATFORM_SHA256 = {
-    "linux-aarch64": "0137b1e7225668ea41ef359ac50865b66b016d4048d0d1f082e50906a4ddcea4",
-    "linux-x86_64": "071aaf393bca6142e9d002f995570b9a439bc09ebfbc4ec7c995619217e6b468",
-    "macos-aarch64": "959564f213bab41a40ca0b0280f82e981b0c7afc0a46bf875f8a8c2e0bd776ae",
-    "macos-x86_64": "563ddb8c58fde5efaa32d94756fd6095b5d229abbf3d1d7e6a9e54c3fcf69bb5",
-    "windows-x86_64": "aa1c95e74b703a5946a168e404ce0f57e70db43e6c1c1ba89a65fab254df29c1",
+    "linux-aarch64": "67c81abc575e0fec27be3a49008e2d7cdf70cc8b33606ee1cf6837cc90300690",
+    "linux-x86_64": "e6e2e8de6c96b20470a1b9f42df54abecd33a5d5da0e33e643f410b362ed999c",
+    "macos-aarch64": "f553944a47ff27954acfd8cc41dc28dc71253e3598812e8b9c69e48e48ea5965",
+    "macos-x86_64": "7e8a54c5592566df1da25d61ee2eae1fc5a89ae4dcbbf816ce6051001e53538b",
+    "windows-x86_64": "f9f41cfa573db25925506ca4c96d7b23b97f4111aac322e66a23b686b63f669f",
 }
 
 _HOST_PLATFORM_EXT = {