diff --git a/contrib/automation/hgautomation/linux.py b/contrib/automation/hgautomation/linux.py
--- a/contrib/automation/hgautomation/linux.py
+++ b/contrib/automation/hgautomation/linux.py
@@ -77,6 +77,18 @@
     '\r\n', '\n'
 )
 
+INSTALL_PYOXIDIZER = r'''
+PYOXIDIZER_VERSION=0.15.0
+PYOXIDIZER_SHA256=396c9b271174b108dcd9ec1f8b9b93839930890b41a859e7945948bcec57fae9
+PYOXIDIZER_URL=https://github.com/indygreg/PyOxidizer/releases/download/pyoxidizer%2F${PYOXIDIZER_VERSION}/pyoxidizer-${PYOXIDIZER_VERSION}-linux_x86_64.zip
+
+wget -O pyoxidizer.zip --progress dot:mega ${PYOXIDIZER_URL}
+echo "${PYOXIDIZER_SHA256} pyoxidizer.zip" | sha256sum --check -
+
+unzip pyoxidizer.zip
+chmod +x pyoxidizer
+sudo mv pyoxidizer /usr/local/bin/pyoxidizer
+'''
 
 INSTALL_RUST = r'''
 RUSTUP_INIT_SHA256=a46fe67199b7bcbbde2dcbc23ae08db6f29883e260e23899a88b9073effc9076
@@ -87,8 +99,6 @@
 sudo -H -u hg -g hg ./rustup-init -y
 sudo -H -u hg -g hg /home/hg/.cargo/bin/rustup install 1.41.1 1.52.0
 sudo -H -u hg -g hg /home/hg/.cargo/bin/rustup component add clippy
-
-sudo -H -u hg -g hg /home/hg/.cargo/bin/cargo install --version 0.10.3 pyoxidizer
 '''
 
 
@@ -319,6 +329,7 @@
 sudo chown `whoami` /hgdev
 
 {install_rust}
+{install_pyoxidizer}
 
 cp requirements-*.txt /hgdev/
 
@@ -344,6 +355,7 @@
 '''.lstrip()
     .format(
         install_rust=INSTALL_RUST,
+        install_pyoxidizer=INSTALL_PYOXIDIZER,
         install_pythons=INSTALL_PYTHONS,
         bootstrap_virtualenv=BOOTSTRAP_VIRTUALENV,
     )
diff --git a/contrib/automation/hgautomation/windows.py b/contrib/automation/hgautomation/windows.py
--- a/contrib/automation/hgautomation/windows.py
+++ b/contrib/automation/hgautomation/windows.py
@@ -69,6 +69,7 @@
 '''.lstrip()
 
 BUILD_INNO_PYTHON3 = r'''
+$Env:PATH = "C:\Program Files\PyOxidizer;$Env:PATH"
 $Env:RUSTUP_HOME = "C:\hgdev\rustup"
 $Env:CARGO_HOME = "C:\hgdev\cargo"
 Set-Location C:\hgdev\src
@@ -79,6 +80,7 @@
 '''
 
 BUILD_INNO_PYTHON2 = r'''
+$Env:PATH = "C:\Program Files\PyOxidizer;$Env:PATH"
 Set-Location C:\hgdev\src
 $python = "C:\hgdev\python27-{arch}\python.exe"
 C:\hgdev\python37-x64\python.exe contrib\packaging\packaging.py inno --python $python {extra_args}
@@ -96,6 +98,7 @@
 '''
 
 BUILD_WIX_PYTHON3 = r'''
+$Env:PATH = "C:\Program Files\PyOxidizer;$Env:PATH"
 $Env:RUSTUP_HOME = "C:\hgdev\rustup"
 $Env:CARGO_HOME = "C:\hgdev\cargo"
 Set-Location C:\hgdev\src
@@ -106,6 +109,7 @@
 '''
 
 BUILD_WIX_PYTHON2 = r'''
+$Env:PATH = "C:\Program Files\PyOxidizer;$Env:PATH"
 Set-Location C:\hgdev\src
 $python = "C:\hgdev\python27-{arch}\python.exe"
 C:\hgdev\python37-x64\python.exe contrib\packaging\packaging.py wix --python $python {extra_args}
@@ -115,6 +119,7 @@
 '''
 
 RUN_TESTS = r'''
+$Env:PATH = "C:\Program Files\PyOxidizer;$Env:PATH"
 C:\hgdev\MinGW\msys\1.0\bin\sh.exe --login -c "cd /c/hgdev/src/tests && /c/hgdev/{python_path}/python.exe run-tests.py {test_flags}"
 if ($LASTEXITCODE -ne 0) {{
     throw "process exited non-0: $LASTEXITCODE"
diff --git a/contrib/install-windows-dependencies.ps1 b/contrib/install-windows-dependencies.ps1
--- a/contrib/install-windows-dependencies.ps1
+++ b/contrib/install-windows-dependencies.ps1
@@ -62,6 +62,9 @@
 $RUSTUP_INIT_URL = "https://static.rust-lang.org/rustup/archive/1.21.1/x86_64-pc-windows-gnu/rustup-init.exe"
 $RUSTUP_INIT_SHA256 = "d17df34ba974b9b19cf5c75883a95475aa22ddc364591d75d174090d55711c72"
 
+$PYOXIDIZER_URL = "https://github.com/indygreg/PyOxidizer/releases/download/pyoxidizer%2F0.15.0/PyOxidizer-0.15.0-x64.msi"
+$PYOXIDIZER_SHA256 = "c866b70431fc5a2690937e265e31834d4be6127c8c8315d1f1412c792cbc29f1"
+
 # Writing progress slows down downloads substantially. So disable it.
 $progressPreference = 'silentlyContinue'
 
@@ -123,9 +126,6 @@
     Invoke-Process "${prefix}\cargo\bin\rustup.exe" "target add i686-pc-windows-msvc"
     Invoke-Process "${prefix}\cargo\bin\rustup.exe" "install 1.52.0"
     Invoke-Process "${prefix}\cargo\bin\rustup.exe" "component add clippy"
-
-    # Install PyOxidizer for packaging.
-    Invoke-Process "${prefix}\cargo\bin\cargo.exe" "install --version 0.10.3 pyoxidizer"
 }
 
 function Install-Dependencies($prefix) {
@@ -151,6 +151,7 @@
     Secure-Download $MINGW_BIN_URL ${prefix}\assets\mingw-get-bin.zip $MINGW_BIN_SHA256
     Secure-Download $MERCURIAL_WHEEL_URL ${prefix}\assets\${MERCURIAL_WHEEL_FILENAME} $MERCURIAL_WHEEL_SHA256
     Secure-Download $RUSTUP_INIT_URL ${prefix}\assets\rustup-init.exe $RUSTUP_INIT_SHA256
+    Secure-Download $PYOXIDIZER_URL ${prefix}\assets\PyOxidizer.msi $PYOXIDIZER_SHA256
 
     Write-Output "installing Python 2.7 32-bit"
     Invoke-Process msiexec.exe "/i ${prefix}\assets\python27-x86.msi /l* ${prefix}\assets\python27-x86.log /q TARGETDIR=${prefix}\python27-x86 ALLUSERS="
@@ -172,6 +173,9 @@
     Write-Output "installing Visual Studio 2017 Build Tools and SDKs"
     Invoke-Process ${prefix}\assets\vs_buildtools.exe "--quiet --wait --norestart --nocache --channelUri https://aka.ms/vs/15/release/channel --add Microsoft.VisualStudio.Workload.MSBuildTools --add Microsoft.VisualStudio.Component.Windows10SDK.17763 --add Microsoft.VisualStudio.Workload.VCTools --add Microsoft.VisualStudio.Component.Windows10SDK --add Microsoft.VisualStudio.Component.VC.140"
 
+    Write-Output "installing PyOxidizer"
+    Invoke-Process msiexec.exe "/i ${prefix}\assets\PyOxidizer.msi /l* ${prefix}\assets\PyOxidizer.log /quiet"
+
     Install-Rust ${prefix}
 
     Write-Output "installing Visual C++ 9.0 for Python 2.7"