diff --git a/aarch64/Dockerfile b/aarch64/Dockerfile
index abd1720..a8cde0f 100644
--- a/aarch64/Dockerfile
+++ b/aarch64/Dockerfile
@@ -6,7 +6,7 @@ LABEL maintainer="Andre Germann" \
 ENV DEBIAN_FRONTEND noninteractive
 
 # Install prerequisites (as listed in iobroker installer.sh)
-RUN apt-get update && apt-get upgrade -y && apt-get install -y \
+RUN apt-get update && apt-get install -y \
     acl \
     apt-utils \
     build-essential \
diff --git a/amd64/Dockerfile b/amd64/Dockerfile
index 9eec8a6..43dd2fe 100644
--- a/amd64/Dockerfile
+++ b/amd64/Dockerfile
@@ -6,7 +6,7 @@ LABEL maintainer="Andre Germann" \
 ENV DEBIAN_FRONTEND noninteractive
 
 # Install prerequisites (as listed in iobroker installer.sh)
-RUN apt-get update && apt-get upgrade -y && apt-get install -y \
+RUN apt-get update && apt-get install -y \
     acl \
     apt-utils \
     build-essential \
diff --git a/armv7hf/Dockerfile b/armv7hf/Dockerfile
index 9ce6797..3a159a9 100644
--- a/armv7hf/Dockerfile
+++ b/armv7hf/Dockerfile
@@ -6,7 +6,7 @@ LABEL maintainer="Andre Germann" \
 ENV DEBIAN_FRONTEND noninteractive
 
 # Install prerequisites (as listed in iobroker installer.sh)
-RUN apt-get update && apt-get upgrade -y && apt-get install -y \
+RUN apt-get update && apt-get install -y \
     acl \
     apt-utils \
     build-essential \