diff --git a/Dockerfile.ubuntu-1804 b/Dockerfile.ubuntu-1804
index 2083a7c..fdb45b1 100644
--- a/Dockerfile.ubuntu-1804
+++ b/Dockerfile.ubuntu-1804
@@ -11,7 +11,7 @@ RUN echo "**** Install SteamCMD ****" \
   && echo steam steam/license note '' | debconf-set-selections \
   && dpkg --add-architecture i386 \
   && apt-get update \
-  && apt-get install -y --no-install-recommends ca-certificates locales lib32gcc1 libsdl2-2.0-0:i386 steamcmd \
+  && apt-get install -y --no-install-recommends ca-certificates locales lib32gcc1 libsdl2-2.0-0:i386 tzdata steamcmd \
   && ln -s /usr/games/steamcmd /usr/bin/steamcmd \
   && apt-get -y autoremove \
   && apt-get -y clean \
@@ -21,8 +21,8 @@ RUN echo "**** Install SteamCMD ****" \
 
 # Add unicode support
 RUN locale-gen en_US.UTF-8
-ENV LANG 'en_US.UTF-8'
-ENV LANGUAGE 'en_US:en'
+ENV LANG=en_US.UTF-8
+ENV LANGUAGE=en_US:en
 
 ENTRYPOINT ["steamcmd"]
 CMD ["+help", "+quit"]
diff --git a/Dockerfile.ubuntu-2004 b/Dockerfile.ubuntu-2004
index a83ad80..3cefb6c 100644
--- a/Dockerfile.ubuntu-2004
+++ b/Dockerfile.ubuntu-2004
@@ -11,7 +11,7 @@ RUN echo "**** Install SteamCMD ****" \
   && echo steam steam/license note '' | debconf-set-selections \
   && dpkg --add-architecture i386 \
   && apt-get update \
-  && apt-get install -y --no-install-recommends ca-certificates locales lib32gcc1 libsdl2-2.0-0:i386 steamcmd \
+  && apt-get install -y --no-install-recommends ca-certificates locales lib32gcc1 libsdl2-2.0-0:i386 tzdata steamcmd \
   && ln -s /usr/games/steamcmd /usr/bin/steamcmd \
   && apt-get -y autoremove \
   && apt-get -y clean \
@@ -21,8 +21,8 @@ RUN echo "**** Install SteamCMD ****" \
 
 # Add unicode support
 RUN locale-gen en_US.UTF-8
-ENV LANG 'en_US.UTF-8'
-ENV LANGUAGE 'en_US:en'
+ENV LANG=en_US.UTF-8
+ENV LANGUAGE=en_US:en
 
 ENTRYPOINT ["steamcmd"]
 CMD ["+help", "+quit"]
diff --git a/Dockerfile.ubuntu-2204 b/Dockerfile.ubuntu-2204
index e264e6b..c60604d 100644
--- a/Dockerfile.ubuntu-2204
+++ b/Dockerfile.ubuntu-2204
@@ -11,7 +11,7 @@ RUN echo "**** Install SteamCMD ****" \
   && echo steam steam/license note '' | debconf-set-selections \
   && dpkg --add-architecture i386 \
   && apt-get update \
-  && apt-get install -y --no-install-recommends ca-certificates locales lib32gcc-s1 libsdl2-2.0-0:i386 steamcmd \
+  && apt-get install -y --no-install-recommends ca-certificates locales lib32gcc-s1 libsdl2-2.0-0:i386 tzdata steamcmd \
   && ln -s /usr/games/steamcmd /usr/bin/steamcmd \
   && apt-get -y autoremove \
   && apt-get -y clean \
@@ -21,8 +21,8 @@ RUN echo "**** Install SteamCMD ****" \
 
 # Add unicode support
 RUN locale-gen en_US.UTF-8
-ENV LANG 'en_US.UTF-8'
-ENV LANGUAGE 'en_US:en'
+ENV LANG=en_US.UTF-8
+ENV LANGUAGE=en_US:en
 
 ENTRYPOINT ["steamcmd"]
 CMD ["+help", "+quit"]
diff --git a/Dockerfile.ubuntu-2404 b/Dockerfile.ubuntu-2404
index f609ed6..20a1643 100644
--- a/Dockerfile.ubuntu-2404
+++ b/Dockerfile.ubuntu-2404
@@ -11,7 +11,7 @@ RUN echo "**** Install SteamCMD ****" \
   && echo steam steam/license note '' | debconf-set-selections \
   && dpkg --add-architecture i386 \
   && apt-get update \
-  && apt-get install -y --no-install-recommends ca-certificates locales lib32gcc-s1 libsdl2-2.0-0:i386 steamcmd \
+  && apt-get install -y --no-install-recommends ca-certificates locales lib32gcc-s1 libsdl2-2.0-0:i386 tzdata steamcmd \
   && ln -s /usr/games/steamcmd /usr/bin/steamcmd \
   && apt-get -y autoremove \
   && apt-get -y clean \
@@ -21,8 +21,8 @@ RUN echo "**** Install SteamCMD ****" \
 
 # Add unicode support
 RUN locale-gen en_US.UTF-8
-ENV LANG 'en_US.UTF-8'
-ENV LANGUAGE 'en_US:en'
+ENV LANG=en_US.UTF-8
+ENV LANGUAGE=en_US:en
 
 ENTRYPOINT ["steamcmd"]
 CMD ["+help", "+quit"]