diff --git a/Dockerfile b/Dockerfile
index b849009..12b8500 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -18,7 +18,7 @@ RUN if [ "$(uname -m)" != "x86_64" -a "$(uname -m)" != "i386" ]; then \
 RUN python3 -m pip install gsutil --break-system-packages
 
 RUN echo "en_US.UTF-8 UTF-8" > /etc/locale.gen && apt-get install -y locales -qq && locale-gen
-ENV LANG en_US.UTF-8 LANGUAGE=en_US.UTF-8 LC_ALL=en_US.UTF-8 HOME=/tmp
+ENV LANG=en_US.UTF-8 LANGUAGE=en_US.UTF-8 LC_ALL=en_US.UTF-8 HOME=/tmp
 RUN mkdir -p /home/tunasync-scripts
 CMD ["/bin/bash"]
 
diff --git a/dockerfiles/ftpsync/Dockerfile b/dockerfiles/ftpsync/Dockerfile
index 4f76dbf..81b6f7d 100644
--- a/dockerfiles/ftpsync/Dockerfile
+++ b/dockerfiles/ftpsync/Dockerfile
@@ -7,6 +7,6 @@ RUN apt-get update && \
 
 RUN git clone https://ftp-master.debian.org/git/archvsync.git/ /ftpsync/
 WORKDIR /ftpsync/
-ENV PATH /ftpsync/bin:${PATH}
+ENV PATH=/ftpsync/bin:${PATH}
 CMD ["/bin/bash"]
 
diff --git a/dockerfiles/nix-channels/Dockerfile b/dockerfiles/nix-channels/Dockerfile
index bd37ebe..c35cdd4 100644
--- a/dockerfiles/nix-channels/Dockerfile
+++ b/dockerfiles/nix-channels/Dockerfile
@@ -16,5 +16,5 @@ RUN mkdir -p /tmp/nix.unpack && \
     ln -s /nix/store/*-nix-*/bin/* /usr/local/bin && \
     rm -rf /tmp/nix.unpack
 
-ENV HOME /tmp
+ENV HOME=/tmp
 CMD ["/bin/bash"]
diff --git a/dockerfiles/pub-mirror/Dockerfile b/dockerfiles/pub-mirror/Dockerfile
index befcab1..53c199e 100644
--- a/dockerfiles/pub-mirror/Dockerfile
+++ b/dockerfiles/pub-mirror/Dockerfile
@@ -14,8 +14,8 @@ RUN \
   mv /usr/lib/dart-sdk /usr/lib/dart && \
   chmod -R "og+rX" /usr/lib/dart
 
-ENV DART_SDK /usr/lib/dart
-ENV PATH $DART_SDK/bin:/root/.pub-cache/bin:$PATH
+ENV DART_SDK=/usr/lib/dart
+ENV PATH=$DART_SDK/bin:/root/.pub-cache/bin:$PATH
 WORKDIR /root
 
 RUN set -eux; \
@@ -46,7 +46,7 @@ RUN set -eux; \
 FROM dart-build
 LABEL maintainer="HUI Yiqun <i@huiyiqun.me>"
 
-ENV PUB_CACHE /pub-cache
+ENV PUB_CACHE=/pub-cache
 
 RUN pub global activate -s git https://github.com/tuna/pub-mirror.git
 
diff --git a/dockerfiles/rubygems-mirror/Dockerfile b/dockerfiles/rubygems-mirror/Dockerfile
index 270131a..b5a4495 100644
--- a/dockerfiles/rubygems-mirror/Dockerfile
+++ b/dockerfiles/rubygems-mirror/Dockerfile
@@ -2,5 +2,5 @@ FROM ruby:2.7-alpine
 RUN gem install rubygems-mirror
 RUN apk add bash curl
 # the command timeout provided by old verison of busybox was incompatible with that from coreutils and is compatible now. 
-ENV BUSYBOX 0
-ENV HOME /tmp
+ENV BUSYBOX=0
+ENV HOME=/tmp
diff --git a/retired/dockerfiles/julia-mirror/Dockerfile b/retired/dockerfiles/julia-mirror/Dockerfile
index 5342876..6f2ca45 100644
--- a/retired/dockerfiles/julia-mirror/Dockerfile
+++ b/retired/dockerfiles/julia-mirror/Dockerfile
@@ -8,7 +8,7 @@ FROM julia:1.5
 LABEL description="A community maintained docker script to set up julia mirror easily."
 LABEL maintainer="Johnny Chen <johnnychen94@hotmail.com>"
 
-ENV JULIA_DEPOT_PATH "/opt/julia"
+ENV JULIA_DEPOT_PATH="/opt/julia"
 
 RUN adduser --uid 2000 tunasync && \
     julia -e 'using Pkg; pkg"add StorageMirrorServer@0.2.0"' && \