diff --git a/1.7-rc/buster/Dockerfile b/1.7-rc/buster/Dockerfile
index a4de602..00899d9 100644
--- a/1.7-rc/buster/Dockerfile
+++ b/1.7-rc/buster/Dockerfile
@@ -17,7 +17,7 @@ ENV PATH $JULIA_PATH/bin:$PATH
 ENV JULIA_GPG 3673DF529D9049477F76B37566E3C7DC03D6E495
 
 # https://julialang.org/downloads/
-ENV JULIA_VERSION 1.7.0-beta3
+ENV JULIA_VERSION 1.7.0-beta4
 
 RUN set -eux; \
 	\
@@ -32,18 +32,20 @@ RUN set -eux; \
 	fi; \
 	\
 # https://julialang.org/downloads/#julia-command-line-version
-# https://julialang-s3.julialang.org/bin/checksums/julia-1.7.0-beta3.sha256
+# https://julialang-s3.julialang.org/bin/checksums/julia-1.7.0-beta4.sha256
 # this "case" statement is generated via "update.sh"
 	dpkgArch="$(dpkg --print-architecture)"; \
 	case "${dpkgArch##*-}" in \
 # amd64
-		amd64) tarArch='x86_64'; dirArch='x64'; sha256='d960b9cb68cc58e065d0f0303e1080eefc694b7dc9179043ace6bc9ca7d4b1c7' ;; \
+		amd64) tarArch='x86_64'; dirArch='x64'; sha256='4ae6cbd9378d63bdf75c74c8785068a18926638de4913d32cfab8ef0409f1e6e' ;; \
+# arm32v7
+		armhf) tarArch='armv7l'; dirArch='armv7l'; sha256='2d334d098a65eb704c57a24c773d27665353e35ae726ff7bd0807035f449223b' ;; \
 # arm64v8
-		arm64) tarArch='aarch64'; dirArch='aarch64'; sha256='02a1191f313bf52eb0014207fbeaffc2c6c8e3f7cdf3d4258b080175ce31da15' ;; \
+		arm64) tarArch='aarch64'; dirArch='aarch64'; sha256='d57efd789e33da133ef0e3e52bd90f34046c6b86ecec669d592b69e5d73d5bb5' ;; \
 # i386
-		i386) tarArch='i686'; dirArch='x86'; sha256='a655078780f48a5709cf719c8684aed50d7efe2284a3817f2ff50ecbdb7553b9' ;; \
+		i386) tarArch='i686'; dirArch='x86'; sha256='62ff97c5df5972ed1647d7a58307829081b5f8840f44fe94f691c9302f9ae624' ;; \
 # ppc64le
-		ppc64el) tarArch='ppc64le'; dirArch='ppc64le'; sha256='e74d2a50bb7d0db380737ea3dc5c16d5762813a5d3fcf832bb948d8fc8fa355b' ;; \
+		ppc64el) tarArch='ppc64le'; dirArch='ppc64le'; sha256='d939660db67be971ce4871f0f4a44c30de63c787fd219b6dcc099eebfaee76d1' ;; \
 		*) echo >&2 "error: current architecture ($dpkgArch) does not have a corresponding Julia binary release"; exit 1 ;; \
 	esac; \
 	\
diff --git a/1.7-rc/windows/windowsservercore-1809/Dockerfile b/1.7-rc/windows/windowsservercore-1809/Dockerfile
index 54f69af..8a478f7 100644
--- a/1.7-rc/windows/windowsservercore-1809/Dockerfile
+++ b/1.7-rc/windows/windowsservercore-1809/Dockerfile
@@ -3,8 +3,8 @@ 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 1.7.0-beta3
-ENV JULIA_SHA256 824890063b3a5715609ef3141ee6334afe1c0ce0259f1145e0ceb6ab0386af79
+ENV JULIA_VERSION 1.7.0-beta4
+ENV JULIA_SHA256 fb6dcebf9d40c4fa855670fd20f31ecd830282720396c71f98d8ab92d32a94ad
 
 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); \
diff --git a/1.7-rc/windows/windowsservercore-ltsc2016/Dockerfile b/1.7-rc/windows/windowsservercore-ltsc2016/Dockerfile
index 1eee755..715926f 100644
--- a/1.7-rc/windows/windowsservercore-ltsc2016/Dockerfile
+++ b/1.7-rc/windows/windowsservercore-ltsc2016/Dockerfile
@@ -3,8 +3,8 @@ 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 1.7.0-beta3
-ENV JULIA_SHA256 824890063b3a5715609ef3141ee6334afe1c0ce0259f1145e0ceb6ab0386af79
+ENV JULIA_VERSION 1.7.0-beta4
+ENV JULIA_SHA256 fb6dcebf9d40c4fa855670fd20f31ecd830282720396c71f98d8ab92d32a94ad
 
 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); \