diff --git a/1.6-rc/buster/Dockerfile b/1.6-rc/buster/Dockerfile
new file mode 100644
index 0000000..5eaf912
--- /dev/null
+++ b/1.6-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 1.6.0-beta1
+
+RUN set -eux; \
+	\
+	savedAptMark="$(apt-mark showmanual)"; \
+	if ! command -v gpg > /dev/null; then \
+		apt-get update; \
+		apt-get install -y --no-install-recommends \
+			gnupg \
+			dirmngr \
+		; \
+		rm -rf /var/lib/apt/lists/*; \
+	fi; \
+	\
+# https://julialang.org/downloads/#julia-command-line-version
+# https://julialang-s3.julialang.org/bin/checksums/julia-1.6.0-beta1.sha256
+# this "case" statement is generated via "update.sh"
+	dpkgArch="$(dpkg --print-architecture)"; \
+	case "${dpkgArch##*-}" in \
+# amd64
+		amd64) tarArch='x86_64'; dirArch='x64'; sha256='30b214c7f544c6589a20104eaa6764eb368cadac5fa834b7454b747043e5a2b8' ;; \
+# arm64v8
+		arm64) tarArch='aarch64'; dirArch='aarch64'; sha256='6f4a0d63c7bc69b5e649710c31affe7e39a554c895235df50eddc9d26bcc3910' ;; \
+# i386
+		i386) tarArch='i686'; dirArch='x86'; sha256='de8c8e3560974196c09b4a01c91591ce4faf8c77daf080fb37b9e2759c5df29d' ;; \
+# ppc64le
+		ppc64el) tarArch='ppc64le'; dirArch='ppc64le'; sha256='13f6192990d1c44039444707d8753d80b299c3fa05625ee9ca1680413ae344cd' ;; \
+		*) echo >&2 "error: current architecture ($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/1.6-rc/windows/windowsservercore-1809/Dockerfile b/1.6-rc/windows/windowsservercore-1809/Dockerfile
new file mode 100644
index 0000000..88b99b9
--- /dev/null
+++ b/1.6-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 1.6.0-beta1
+ENV JULIA_SHA256 f308a7b7e877a232a19d47d78b4bf55a974c9c24052ab867f346a151a8a91f90
+
+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/1.6-rc/windows/windowsservercore-ltsc2016/Dockerfile b/1.6-rc/windows/windowsservercore-ltsc2016/Dockerfile
new file mode 100644
index 0000000..1e9430d
--- /dev/null
+++ b/1.6-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 1.6.0-beta1
+ENV JULIA_SHA256 f308a7b7e877a232a19d47d78b4bf55a974c9c24052ab867f346a151a8a91f90
+
+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/generate-stackbrew-library.sh b/generate-stackbrew-library.sh
index 61b3874..8281303 100755
--- a/generate-stackbrew-library.sh
+++ b/generate-stackbrew-library.sh
@@ -3,7 +3,6 @@ set -Eeuo pipefail
 
 declare -A aliases=(
 	[1.5]='1 latest'
-	[1.6-rc]='rc'
 )
 defaultDebianVariant='buster'
 defaultAlpineVariant='alpine3.12'