diff --git a/.appveyor.yml b/.appveyor.yml
index 8ff7462..68f9185 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -3,6 +3,12 @@ image: Visual Studio 2017
 
 environment:
   matrix:
+    - version: 1.4-rc
+      variant: windowsservercore-1809
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+    - version: 1.4-rc
+      variant: windowsservercore-ltsc2016
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
     - version: 1.3
       variant: windowsservercore-1809
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
diff --git a/.travis.yml b/.travis.yml
index c0182d7..e0bc448 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,10 @@ services: docker
 
 matrix:
   include:
+    - os: linux
+      env: VERSION=1.4-rc VARIANT=buster ARCH=
+    - os: linux
+      env: VERSION=1.4-rc VARIANT=buster ARCH=i386
     - os: linux
       env: VERSION=1.3 VARIANT=buster ARCH=
     - os: linux
diff --git a/1.0/windows/windowsservercore-1809/Dockerfile b/1.0/windows/windowsservercore-1809/Dockerfile
index 842ff9e..45f7fbd 100644
--- a/1.0/windows/windowsservercore-1809/Dockerfile
+++ b/1.0/windows/windowsservercore-1809/Dockerfile
@@ -7,34 +7,34 @@ ENV JULIA_VERSION 1.0.5
 ENV JULIA_SHA256 83c04bdc264e7ab87f4e22be9f3dff8c5a62a49c8edea6a0c85f4645d4cbac7a
 
 RUN $url = ('https://julialang-s3.julialang.org/bin/winnt/x64/{1}/julia-{0}-win64.exe' -f $env:JULIA_VERSION, ($env:JULIA_VERSION.Split('.')[0..1] -Join '.')); \
-        Write-Host ('Downloading {0} ...' -f $url); \
-        [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
-        Invoke-WebRequest -Uri $url -OutFile 'julia.exe'; \
-        \
-        Write-Host ('Verifying sha256 ({0}) ...' -f $env:JULIA_SHA256); \
-        if ((Get-FileHash julia.exe -Algorithm sha256).Hash -ne $env:JULIA_SHA256) { \
-                Write-Host 'FAILED!'; \
-                exit 1; \
-        }; \
-        \
-        Write-Host 'Installing ...'; \
-        Start-Process -Wait -NoNewWindow \
-                -FilePath '.\julia.exe' \
-                -ArgumentList @( \
-                        '/S', \
-                        '/D=C:\julia' \
-                ); \
-        \
-        Write-Host 'Updating PATH ...'; \
-        $env:PATH = 'C:\julia\bin;' + $env:PATH; \
-        [Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); \
-        \
-        Write-Host 'Verifying install ("julia --version") ...'; \
-        julia --version; \
-        \
-        Write-Host 'Removing ...'; \
-        Remove-Item julia.exe -Force; \
-        \
-        Write-Host 'Complete.'
+	Write-Host ('Downloading {0} ...' -f $url); \
+	[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
+	Invoke-WebRequest -Uri $url -OutFile 'julia.exe'; \
+	\
+	Write-Host ('Verifying sha256 ({0}) ...' -f $env:JULIA_SHA256); \
+	if ((Get-FileHash julia.exe -Algorithm sha256).Hash -ne $env:JULIA_SHA256) { \
+		Write-Host 'FAILED!'; \
+		exit 1; \
+	}; \
+	\
+	Write-Host 'Installing ...'; \
+	Start-Process -Wait -NoNewWindow \
+		-FilePath '.\julia.exe' \
+		-ArgumentList @( \
+			'/S', \
+			'/D=C:\julia' \
+		); \
+	\
+	Write-Host 'Updating PATH ...'; \
+	$env:PATH = 'C:\julia\bin;' + $env:PATH; \
+	[Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); \
+	\
+	Write-Host 'Verifying install ("julia --version") ...'; \
+	julia --version; \
+	\
+	Write-Host 'Removing ...'; \
+	Remove-Item julia.exe -Force; \
+	\
+	Write-Host 'Complete.'
 
 CMD ["julia"]
diff --git a/1.0/windows/windowsservercore-ltsc2016/Dockerfile b/1.0/windows/windowsservercore-ltsc2016/Dockerfile
index ef01691..fdce374 100644
--- a/1.0/windows/windowsservercore-ltsc2016/Dockerfile
+++ b/1.0/windows/windowsservercore-ltsc2016/Dockerfile
@@ -7,34 +7,34 @@ ENV JULIA_VERSION 1.0.5
 ENV JULIA_SHA256 83c04bdc264e7ab87f4e22be9f3dff8c5a62a49c8edea6a0c85f4645d4cbac7a
 
 RUN $url = ('https://julialang-s3.julialang.org/bin/winnt/x64/{1}/julia-{0}-win64.exe' -f $env:JULIA_VERSION, ($env:JULIA_VERSION.Split('.')[0..1] -Join '.')); \
-        Write-Host ('Downloading {0} ...' -f $url); \
-        [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
-        Invoke-WebRequest -Uri $url -OutFile 'julia.exe'; \
-        \
-        Write-Host ('Verifying sha256 ({0}) ...' -f $env:JULIA_SHA256); \
-        if ((Get-FileHash julia.exe -Algorithm sha256).Hash -ne $env:JULIA_SHA256) { \
-                Write-Host 'FAILED!'; \
-                exit 1; \
-        }; \
-        \
-        Write-Host 'Installing ...'; \
-        Start-Process -Wait -NoNewWindow \
-                -FilePath '.\julia.exe' \
-                -ArgumentList @( \
-                        '/S', \
-                        '/D=C:\julia' \
-                ); \
-        \
-        Write-Host 'Updating PATH ...'; \
-        $env:PATH = 'C:\julia\bin;' + $env:PATH; \
-        [Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); \
-        \
-        Write-Host 'Verifying install ("julia --version") ...'; \
-        julia --version; \
-        \
-        Write-Host 'Removing ...'; \
-        Remove-Item julia.exe -Force; \
-        \
-        Write-Host 'Complete.'
+	Write-Host ('Downloading {0} ...' -f $url); \
+	[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
+	Invoke-WebRequest -Uri $url -OutFile 'julia.exe'; \
+	\
+	Write-Host ('Verifying sha256 ({0}) ...' -f $env:JULIA_SHA256); \
+	if ((Get-FileHash julia.exe -Algorithm sha256).Hash -ne $env:JULIA_SHA256) { \
+		Write-Host 'FAILED!'; \
+		exit 1; \
+	}; \
+	\
+	Write-Host 'Installing ...'; \
+	Start-Process -Wait -NoNewWindow \
+		-FilePath '.\julia.exe' \
+		-ArgumentList @( \
+			'/S', \
+			'/D=C:\julia' \
+		); \
+	\
+	Write-Host 'Updating PATH ...'; \
+	$env:PATH = 'C:\julia\bin;' + $env:PATH; \
+	[Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); \
+	\
+	Write-Host 'Verifying install ("julia --version") ...'; \
+	julia --version; \
+	\
+	Write-Host 'Removing ...'; \
+	Remove-Item julia.exe -Force; \
+	\
+	Write-Host 'Complete.'
 
 CMD ["julia"]
diff --git a/1.3/windows/windowsservercore-1809/Dockerfile b/1.3/windows/windowsservercore-1809/Dockerfile
index c4cd99f..08000b7 100644
--- a/1.3/windows/windowsservercore-1809/Dockerfile
+++ b/1.3/windows/windowsservercore-1809/Dockerfile
@@ -7,34 +7,34 @@ ENV JULIA_VERSION 1.3.1
 ENV JULIA_SHA256 8350ca66f80484c5ca6f7341ffbdb9d5182f8d4231762d585e229567b227ef7f
 
 RUN $url = ('https://julialang-s3.julialang.org/bin/winnt/x64/{1}/julia-{0}-win64.exe' -f $env:JULIA_VERSION, ($env:JULIA_VERSION.Split('.')[0..1] -Join '.')); \
-        Write-Host ('Downloading {0} ...' -f $url); \
-        [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
-        Invoke-WebRequest -Uri $url -OutFile 'julia.exe'; \
-        \
-        Write-Host ('Verifying sha256 ({0}) ...' -f $env:JULIA_SHA256); \
-        if ((Get-FileHash julia.exe -Algorithm sha256).Hash -ne $env:JULIA_SHA256) { \
-                Write-Host 'FAILED!'; \
-                exit 1; \
-        }; \
-        \
-        Write-Host 'Installing ...'; \
-        Start-Process -Wait -NoNewWindow \
-                -FilePath '.\julia.exe' \
-                -ArgumentList @( \
-                        '/S', \
-                        '/D=C:\julia' \
-                ); \
-        \
-        Write-Host 'Updating PATH ...'; \
-        $env:PATH = 'C:\julia\bin;' + $env:PATH; \
-        [Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); \
-        \
-        Write-Host 'Verifying install ("julia --version") ...'; \
-        julia --version; \
-        \
-        Write-Host 'Removing ...'; \
-        Remove-Item julia.exe -Force; \
-        \
-        Write-Host 'Complete.'
+	Write-Host ('Downloading {0} ...' -f $url); \
+	[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
+	Invoke-WebRequest -Uri $url -OutFile 'julia.exe'; \
+	\
+	Write-Host ('Verifying sha256 ({0}) ...' -f $env:JULIA_SHA256); \
+	if ((Get-FileHash julia.exe -Algorithm sha256).Hash -ne $env:JULIA_SHA256) { \
+		Write-Host 'FAILED!'; \
+		exit 1; \
+	}; \
+	\
+	Write-Host 'Installing ...'; \
+	Start-Process -Wait -NoNewWindow \
+		-FilePath '.\julia.exe' \
+		-ArgumentList @( \
+			'/S', \
+			'/D=C:\julia' \
+		); \
+	\
+	Write-Host 'Updating PATH ...'; \
+	$env:PATH = 'C:\julia\bin;' + $env:PATH; \
+	[Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); \
+	\
+	Write-Host 'Verifying install ("julia --version") ...'; \
+	julia --version; \
+	\
+	Write-Host 'Removing ...'; \
+	Remove-Item julia.exe -Force; \
+	\
+	Write-Host 'Complete.'
 
 CMD ["julia"]
diff --git a/1.3/windows/windowsservercore-ltsc2016/Dockerfile b/1.3/windows/windowsservercore-ltsc2016/Dockerfile
index 89dbf3e..8117e20 100644
--- a/1.3/windows/windowsservercore-ltsc2016/Dockerfile
+++ b/1.3/windows/windowsservercore-ltsc2016/Dockerfile
@@ -7,34 +7,34 @@ ENV JULIA_VERSION 1.3.1
 ENV JULIA_SHA256 8350ca66f80484c5ca6f7341ffbdb9d5182f8d4231762d585e229567b227ef7f
 
 RUN $url = ('https://julialang-s3.julialang.org/bin/winnt/x64/{1}/julia-{0}-win64.exe' -f $env:JULIA_VERSION, ($env:JULIA_VERSION.Split('.')[0..1] -Join '.')); \
-        Write-Host ('Downloading {0} ...' -f $url); \
-        [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
-        Invoke-WebRequest -Uri $url -OutFile 'julia.exe'; \
-        \
-        Write-Host ('Verifying sha256 ({0}) ...' -f $env:JULIA_SHA256); \
-        if ((Get-FileHash julia.exe -Algorithm sha256).Hash -ne $env:JULIA_SHA256) { \
-                Write-Host 'FAILED!'; \
-                exit 1; \
-        }; \
-        \
-        Write-Host 'Installing ...'; \
-        Start-Process -Wait -NoNewWindow \
-                -FilePath '.\julia.exe' \
-                -ArgumentList @( \
-                        '/S', \
-                        '/D=C:\julia' \
-                ); \
-        \
-        Write-Host 'Updating PATH ...'; \
-        $env:PATH = 'C:\julia\bin;' + $env:PATH; \
-        [Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); \
-        \
-        Write-Host 'Verifying install ("julia --version") ...'; \
-        julia --version; \
-        \
-        Write-Host 'Removing ...'; \
-        Remove-Item julia.exe -Force; \
-        \
-        Write-Host 'Complete.'
+	Write-Host ('Downloading {0} ...' -f $url); \
+	[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
+	Invoke-WebRequest -Uri $url -OutFile 'julia.exe'; \
+	\
+	Write-Host ('Verifying sha256 ({0}) ...' -f $env:JULIA_SHA256); \
+	if ((Get-FileHash julia.exe -Algorithm sha256).Hash -ne $env:JULIA_SHA256) { \
+		Write-Host 'FAILED!'; \
+		exit 1; \
+	}; \
+	\
+	Write-Host 'Installing ...'; \
+	Start-Process -Wait -NoNewWindow \
+		-FilePath '.\julia.exe' \
+		-ArgumentList @( \
+			'/S', \
+			'/D=C:\julia' \
+		); \
+	\
+	Write-Host 'Updating PATH ...'; \
+	$env:PATH = 'C:\julia\bin;' + $env:PATH; \
+	[Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); \
+	\
+	Write-Host 'Verifying install ("julia --version") ...'; \
+	julia --version; \
+	\
+	Write-Host 'Removing ...'; \
+	Remove-Item julia.exe -Force; \
+	\
+	Write-Host 'Complete.'
 
 CMD ["julia"]
diff --git a/1.4-rc/buster/Dockerfile b/1.4-rc/buster/Dockerfile
new file mode 100644
index 0000000..373b05d
--- /dev/null
+++ b/1.4-rc/buster/Dockerfile
@@ -0,0 +1,73 @@
+FROM debian:buster-slim
+
+RUN set -eux; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends \
+		ca-certificates \
+# ERROR: no download agent available; install curl, wget, or fetch
+		curl \
+	; \
+	rm -rf /var/lib/apt/lists/*
+
+ENV JULIA_PATH /usr/local/julia
+ENV PATH $JULIA_PATH/bin:$PATH
+
+# https://julialang.org/juliareleases.asc
+# Julia (Binary signing key) <buildbot@julialang.org>
+ENV JULIA_GPG 3673DF529D9049477F76B37566E3C7DC03D6E495
+
+# https://julialang.org/downloads/
+ENV JULIA_VERSION 1.4.0-rc1
+
+RUN set -eux; \
+	\
+	savedAptMark="$(apt-mark showmanual)"; \
+	if ! command -v gpg > /dev/null; then \
+		apt-get update; \
+		apt-get install -y --no-install-recommends \
+			gnupg \
+			dirmngr \
+		; \
+		rm -rf /var/lib/apt/lists/*; \
+	fi; \
+	\
+# https://julialang.org/downloads/#julia-command-line-version
+# https://julialang-s3.julialang.org/bin/checksums/julia-1.4.0-rc1.sha256
+# this "case" statement is generated via "update.sh"
+	dpkgArch="$(dpkg --print-architecture)"; \
+	case "${dpkgArch##*-}" in \
+# amd64
+		amd64) tarArch='x86_64'; dirArch='x64'; sha256='9996a9dc0547a97da5157536354645f9a2729b22f35c3d0d9cb42190e6fe3c64' ;; \
+# arm32v7
+		armhf) tarArch='armv7l'; dirArch='armv7l'; sha256='a23f735c44f2d5bd60107a6f14c06c528aaffce8dc97a635e5f60f30c8ea7eaf' ;; \
+# arm64v8
+		arm64) tarArch='aarch64'; dirArch='aarch64'; sha256='9d1a9c5616b35dc8363cf57833b4538a0825429d18cf7287ffe80edf72b4c884' ;; \
+# i386
+		i386) tarArch='i686'; dirArch='x86'; sha256='7f6b7888bb77d2959035ffbb27bd7fc91fc2da77e5c678c74bb0723acf730e1d' ;; \
+		*) echo >&2 "error: current architecture ($dpkgArch) does not have a corresponding Julia binary release"; exit 1 ;; \
+	esac; \
+	\
+	folder="$(echo "$JULIA_VERSION" | cut -d. -f1-2)"; \
+	curl -fL -o julia.tar.gz.asc "https://julialang-s3.julialang.org/bin/linux/${dirArch}/${folder}/julia-${JULIA_VERSION}-linux-${tarArch}.tar.gz.asc"; \
+	curl -fL -o julia.tar.gz     "https://julialang-s3.julialang.org/bin/linux/${dirArch}/${folder}/julia-${JULIA_VERSION}-linux-${tarArch}.tar.gz"; \
+	\
+	echo "${sha256} *julia.tar.gz" | sha256sum -c -; \
+	\
+	export GNUPGHOME="$(mktemp -d)"; \
+	gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys "$JULIA_GPG"; \
+	gpg --batch --verify julia.tar.gz.asc julia.tar.gz; \
+	command -v gpgconf > /dev/null && gpgconf --kill all; \
+	rm -rf "$GNUPGHOME" julia.tar.gz.asc; \
+	\
+	mkdir "$JULIA_PATH"; \
+	tar -xzf julia.tar.gz -C "$JULIA_PATH" --strip-components 1; \
+	rm julia.tar.gz; \
+	\
+	apt-mark auto '.*' > /dev/null; \
+	[ -z "$savedAptMark" ] || apt-mark manual $savedAptMark; \
+	apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
+	\
+# smoke test
+	julia --version
+
+CMD ["julia"]
diff --git a/1.4-rc/windows/windowsservercore-1809/Dockerfile b/1.4-rc/windows/windowsservercore-1809/Dockerfile
new file mode 100644
index 0000000..500fc42
--- /dev/null
+++ b/1.4-rc/windows/windowsservercore-1809/Dockerfile
@@ -0,0 +1,40 @@
+FROM mcr.microsoft.com/windows/servercore:1809
+
+# $ProgressPreference: https://github.com/PowerShell/PowerShell/issues/2138#issuecomment-251261324
+SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
+
+ENV JULIA_VERSION 1.4.0-rc1
+ENV JULIA_SHA256 fc718bfd1fa9da9c306376c8994d3dee4b08131d3198036c33f878cf469f7567
+
+RUN $url = ('https://julialang-s3.julialang.org/bin/winnt/x64/{1}/julia-{0}-win64.exe' -f $env:JULIA_VERSION, ($env:JULIA_VERSION.Split('.')[0..1] -Join '.')); \
+	Write-Host ('Downloading {0} ...' -f $url); \
+	[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
+	Invoke-WebRequest -Uri $url -OutFile 'julia.exe'; \
+	\
+	Write-Host ('Verifying sha256 ({0}) ...' -f $env:JULIA_SHA256); \
+	if ((Get-FileHash julia.exe -Algorithm sha256).Hash -ne $env:JULIA_SHA256) { \
+		Write-Host 'FAILED!'; \
+		exit 1; \
+	}; \
+	\
+	Write-Host 'Installing ...'; \
+	Start-Process -Wait -NoNewWindow \
+		-FilePath '.\julia.exe' \
+		-ArgumentList @( \
+			'/SILENT', \
+			'/DIR=C:\julia' \
+		); \
+	\
+	Write-Host 'Updating PATH ...'; \
+	$env:PATH = 'C:\julia\bin;' + $env:PATH; \
+	[Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); \
+	\
+	Write-Host 'Verifying install ("julia --version") ...'; \
+	julia --version; \
+	\
+	Write-Host 'Removing ...'; \
+	Remove-Item julia.exe -Force; \
+	\
+	Write-Host 'Complete.'
+
+CMD ["julia"]
diff --git a/1.4-rc/windows/windowsservercore-ltsc2016/Dockerfile b/1.4-rc/windows/windowsservercore-ltsc2016/Dockerfile
new file mode 100644
index 0000000..82dcf04
--- /dev/null
+++ b/1.4-rc/windows/windowsservercore-ltsc2016/Dockerfile
@@ -0,0 +1,40 @@
+FROM mcr.microsoft.com/windows/servercore:ltsc2016
+
+# $ProgressPreference: https://github.com/PowerShell/PowerShell/issues/2138#issuecomment-251261324
+SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
+
+ENV JULIA_VERSION 1.4.0-rc1
+ENV JULIA_SHA256 fc718bfd1fa9da9c306376c8994d3dee4b08131d3198036c33f878cf469f7567
+
+RUN $url = ('https://julialang-s3.julialang.org/bin/winnt/x64/{1}/julia-{0}-win64.exe' -f $env:JULIA_VERSION, ($env:JULIA_VERSION.Split('.')[0..1] -Join '.')); \
+	Write-Host ('Downloading {0} ...' -f $url); \
+	[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
+	Invoke-WebRequest -Uri $url -OutFile 'julia.exe'; \
+	\
+	Write-Host ('Verifying sha256 ({0}) ...' -f $env:JULIA_SHA256); \
+	if ((Get-FileHash julia.exe -Algorithm sha256).Hash -ne $env:JULIA_SHA256) { \
+		Write-Host 'FAILED!'; \
+		exit 1; \
+	}; \
+	\
+	Write-Host 'Installing ...'; \
+	Start-Process -Wait -NoNewWindow \
+		-FilePath '.\julia.exe' \
+		-ArgumentList @( \
+			'/SILENT', \
+			'/DIR=C:\julia' \
+		); \
+	\
+	Write-Host 'Updating PATH ...'; \
+	$env:PATH = 'C:\julia\bin;' + $env:PATH; \
+	[Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); \
+	\
+	Write-Host 'Verifying install ("julia --version") ...'; \
+	julia --version; \
+	\
+	Write-Host 'Removing ...'; \
+	Remove-Item julia.exe -Force; \
+	\
+	Write-Host 'Complete.'
+
+CMD ["julia"]
diff --git a/Dockerfile-windowsservercore.template b/Dockerfile-windowsservercore.template
index 3010c90..1ed8fd4 100644
--- a/Dockerfile-windowsservercore.template
+++ b/Dockerfile-windowsservercore.template
@@ -7,34 +7,34 @@ ENV JULIA_VERSION %%JULIA_VERSION%%
 ENV JULIA_SHA256 %%JULIA_WINDOWS_SHA256%%
 
 RUN $url = ('https://julialang-s3.julialang.org/bin/winnt/x64/{1}/julia-{0}-win64.exe' -f $env:JULIA_VERSION, ($env:JULIA_VERSION.Split('.')[0..1] -Join '.')); \
-        Write-Host ('Downloading {0} ...' -f $url); \
-        [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
-        Invoke-WebRequest -Uri $url -OutFile 'julia.exe'; \
-        \
-        Write-Host ('Verifying sha256 ({0}) ...' -f $env:JULIA_SHA256); \
-        if ((Get-FileHash julia.exe -Algorithm sha256).Hash -ne $env:JULIA_SHA256) { \
-                Write-Host 'FAILED!'; \
-                exit 1; \
-        }; \
-        \
-        Write-Host 'Installing ...'; \
-        Start-Process -Wait -NoNewWindow \
-                -FilePath '.\julia.exe' \
-                -ArgumentList @( \
-                        '/S', \
-                        '/D=C:\julia' \
-                ); \
-        \
-        Write-Host 'Updating PATH ...'; \
-        $env:PATH = 'C:\julia\bin;' + $env:PATH; \
-        [Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); \
-        \
-        Write-Host 'Verifying install ("julia --version") ...'; \
-        julia --version; \
-        \
-        Write-Host 'Removing ...'; \
-        Remove-Item julia.exe -Force; \
-        \
-        Write-Host 'Complete.'
+	Write-Host ('Downloading {0} ...' -f $url); \
+	[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
+	Invoke-WebRequest -Uri $url -OutFile 'julia.exe'; \
+	\
+	Write-Host ('Verifying sha256 ({0}) ...' -f $env:JULIA_SHA256); \
+	if ((Get-FileHash julia.exe -Algorithm sha256).Hash -ne $env:JULIA_SHA256) { \
+		Write-Host 'FAILED!'; \
+		exit 1; \
+	}; \
+	\
+	Write-Host 'Installing ...'; \
+	Start-Process -Wait -NoNewWindow \
+		-FilePath '.\julia.exe' \
+		-ArgumentList @( \
+			'/SILENT', \
+			'/DIR=C:\julia' \
+		); \
+	\
+	Write-Host 'Updating PATH ...'; \
+	$env:PATH = 'C:\julia\bin;' + $env:PATH; \
+	[Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine); \
+	\
+	Write-Host 'Verifying install ("julia --version") ...'; \
+	julia --version; \
+	\
+	Write-Host 'Removing ...'; \
+	Remove-Item julia.exe -Force; \
+	\
+	Write-Host 'Complete.'
 
 CMD ["julia"]
diff --git a/generate-stackbrew-library.sh b/generate-stackbrew-library.sh
index 84d61c5..34ce2a8 100755
--- a/generate-stackbrew-library.sh
+++ b/generate-stackbrew-library.sh
@@ -3,6 +3,7 @@ set -Eeuo pipefail
 
 declare -A aliases=(
 	[1.3]='1 latest'
+	[1.4-rc]='rc'
 )
 defaultDebianVariant='buster'
 
diff --git a/update.sh b/update.sh
index 899233c..585970f 100755
--- a/update.sh
+++ b/update.sh
@@ -90,6 +90,16 @@ for version in "${versions[@]}"; do
 			-e 's!%%ARCH-CASE%%!'"$(sed_escape_rhs "$linuxArchCase")"'!g' \
 			"Dockerfile-$template.template" > "$dir/Dockerfile"
 
+		case "$dir" in
+			1.0/windows/* | 1.3/windows/*)
+				# https://github.com/JuliaLang/julia/blob/v1.4.0-rc1/NEWS.md#build-system-changes
+				sed -ri \
+					-e 's!/SILENT!/S!g' \
+					-e 's!/DIR=!/D=!g' \
+					"$dir/Dockerfile"
+				;;
+		esac
+
 		case "$v" in
 			# https://www.appveyor.com/docs/windows-images-software/
 			windows/*-1809)