diff --git a/jessie/x86/Dockerfile b/jessie/x86/Dockerfile
index 01ae39c4d9238147e000f829bb0fadf1a4246935..2beb6e9157158a5b90e7759a3efa9a6b76db71b2 100644
--- a/jessie/x86/Dockerfile
+++ b/jessie/x86/Dockerfile
@@ -1,7 +1,7 @@
 FROM i386/debian:jessie
 
-RUN apt update \
- && apt upgrade -y
+RUN apt-get update \
+ && apt-get upgrade -y
 
 RUN apt-get install -y \
   sudo wget curl tar expect git \
diff --git a/jessie/x86_64/Dockerfile b/jessie/x86_64/Dockerfile
index 241c751a2ebcc7af1ea50d04e8052415e28a987d..a7893b7e97cc7d6c433c157c59e5851c70e0f3fb 100644
--- a/jessie/x86_64/Dockerfile
+++ b/jessie/x86_64/Dockerfile
@@ -1,7 +1,7 @@
 FROM debian:jessie
 
-RUN apt update \
- && apt upgrade -y
+RUN apt-get update \
+ && apt-get upgrade -y
 
 RUN apt-get install -y \
   sudo wget curl tar expect git \
diff --git a/stretch/x86/Dockerfile b/stretch/x86/Dockerfile
index 0bdaa5db6f9475d11b75b98f1fcfe021e9154c0b..876aced864e9f83ab113620d526fe416ad5bb6dd 100644
--- a/stretch/x86/Dockerfile
+++ b/stretch/x86/Dockerfile
@@ -1,7 +1,7 @@
 FROM i386/debian:stretch
 
-RUN apt update \
- && apt upgrade -y
+RUN apt-get update \
+ && apt-get upgrade -y
 
 RUN apt-get install -y \
   sudo wget curl tar expect git \
diff --git a/stretch/x86_64/Dockerfile b/stretch/x86_64/Dockerfile
index 5c4a576dcbe178989b3fee60848ad6fcca7a5f5b..727b569280b8b2496c0d0b26c0f8fbb8427858f7 100644
--- a/stretch/x86_64/Dockerfile
+++ b/stretch/x86_64/Dockerfile
@@ -1,7 +1,7 @@
 FROM debian:stretch
 
-RUN apt update \
- && apt upgrade -y
+RUN apt-get update \
+ && apt-get upgrade -y
 
 RUN apt-get install -y \
   sudo wget curl tar expect git \
diff --git a/wheezy/x86/Dockerfile b/wheezy/x86/Dockerfile
index 01ae39c4d9238147e000f829bb0fadf1a4246935..2beb6e9157158a5b90e7759a3efa9a6b76db71b2 100644
--- a/wheezy/x86/Dockerfile
+++ b/wheezy/x86/Dockerfile
@@ -1,7 +1,7 @@
 FROM i386/debian:jessie
 
-RUN apt update \
- && apt upgrade -y
+RUN apt-get update \
+ && apt-get upgrade -y
 
 RUN apt-get install -y \
   sudo wget curl tar expect git \
diff --git a/wheezy/x86_64/Dockerfile b/wheezy/x86_64/Dockerfile
index 241c751a2ebcc7af1ea50d04e8052415e28a987d..a7893b7e97cc7d6c433c157c59e5851c70e0f3fb 100644
--- a/wheezy/x86_64/Dockerfile
+++ b/wheezy/x86_64/Dockerfile
@@ -1,7 +1,7 @@
 FROM debian:jessie
 
-RUN apt update \
- && apt upgrade -y
+RUN apt-get update \
+ && apt-get upgrade -y
 
 RUN apt-get install -y \
   sudo wget curl tar expect git \