diff --git a/docker/build/build-centos7/Dockerfile b/docker/build/build-centos7/Dockerfile
index 8d0820f..c1e2c44 100644
--- a/docker/build/build-centos7/Dockerfile
+++ b/docker/build/build-centos7/Dockerfile
@@ -16,6 +16,7 @@ RUN yum update -y && \
 
 # fpm packaging
 RUN yum install -y ruby rubygems ruby-devel && \
+	gem install --no-ri --no-rdoc dotenv -v '2.8.1' && \
 	gem install --no-ri --no-rdoc ffi -v '1.9.14' && \
 	gem install --no-ri --no-rdoc git -v '1.6' && \
-	gem install --no-ri --no-rdoc fpm -v '1.11.0'
+	gem install --no-ri --no-rdoc fpm -v '1.12.0'
diff --git a/docker/build/build-centos8/Dockerfile b/docker/build/build-centos8/Dockerfile
index b17cdff..baf5398 100644
--- a/docker/build/build-centos8/Dockerfile
+++ b/docker/build/build-centos8/Dockerfile
@@ -15,6 +15,9 @@ RUN yum update -y && \
 	wget -q -O /usr/include/mysql/hash.h https://raw.githubusercontent.com/mysql/mysql-server/5.7/include/hash.h
 
 # fpm packaging
+RUN dnf module -y enable ruby:3.0
 RUN yum install -y ruby rubygems ruby-devel && \
-	gem install ffi && \
-	gem install fpm
+	gem install --no-document dotenv -v '2.8.1' && \
+	gem install --no-document rexml -v '3.2.6' && \
+	gem install --no-document ffi -v '1.9.14' && \
+	gem install --no-document fpm -v '1.12.0'
diff --git a/docker/build/build-debian10/Dockerfile b/docker/build/build-debian10/Dockerfile
index 001245d..ed19083 100644
--- a/docker/build/build-debian10/Dockerfile
+++ b/docker/build/build-debian10/Dockerfile
@@ -17,5 +17,6 @@ RUN apt-get -y update && \
 
 # fpm packaging
 RUN apt-get -y install ruby ruby-dev && \
-	gem install ffi && \
-	gem install fpm
+	gem install --no-ri --no-rdoc dotenv -v '2.8.1' && \
+	gem install --no-ri --no-rdoc ffi -v '1.9.14' && \
+	gem install --no-ri --no-rdoc fpm -v '1.12.0'
diff --git a/docker/build/build-debian11/Dockerfile b/docker/build/build-debian11/Dockerfile
index 11f1f8e..1a6c14e 100644
--- a/docker/build/build-debian11/Dockerfile
+++ b/docker/build/build-debian11/Dockerfile
@@ -17,5 +17,6 @@ RUN apt-get -y update && \
 
 # fpm packaging
 RUN apt-get -y install ruby ruby-dev && \
-	gem install ffi && \
-	gem install fpm
+	gem install --no-document dotenv -v '2.8.1' && \
+	gem install --no-document ffi -v '1.9.14' && \
+	gem install --no-document fpm -v '1.12.0'
diff --git a/docker/build/build-debian9/Dockerfile b/docker/build/build-debian9/Dockerfile
index 90084e8..47f2fb3 100644
--- a/docker/build/build-debian9/Dockerfile
+++ b/docker/build/build-debian9/Dockerfile
@@ -17,5 +17,6 @@ RUN apt-get -y update && \
 
 # fpm packaging
 RUN apt-get -y install ruby ruby-dev && \
-	gem install ffi && \
-	gem install fpm
+	gem install --no-ri --no-rdoc dotenv -v '2.8.1' && \
+	gem install --no-ri --no-rdoc ffi -v '1.9.14' && \
+	gem install --no-ri --no-rdoc fpm -v '1.12.0'
diff --git a/docker/build/build-ubuntu16/Dockerfile b/docker/build/build-ubuntu16/Dockerfile
index 4c076e9..151b7c1 100644
--- a/docker/build/build-ubuntu16/Dockerfile
+++ b/docker/build/build-ubuntu16/Dockerfile
@@ -5,8 +5,12 @@ MAINTAINER Miro Stauder <miro@proxysql.com>
 # set git safe dir
 RUN git config --system --add safe.directory /opt/
 
-# fpm packaging
+# build dependencies
 RUN apt-get -y update && \
-	apt-get -y install ruby ruby-dev && \
+	apt-get -y install libboost-all-dev
+
+# fpm packaging
+RUN apt-get -y install ruby ruby-dev && \
+	gem install --no-ri --no-rdoc dotenv -v '2.8.1' && \
 	gem install --no-ri --no-rdoc ffi -v '1.9.14' && \
-	gem install --no-ri --no-rdoc fpm -v '1.11.0'
+	gem install --no-ri --no-rdoc fpm -v '1.12.0'
diff --git a/docker/build/build-ubuntu18/Dockerfile b/docker/build/build-ubuntu18/Dockerfile
index 01fb39a..95fd293 100644
--- a/docker/build/build-ubuntu18/Dockerfile
+++ b/docker/build/build-ubuntu18/Dockerfile
@@ -5,8 +5,12 @@ MAINTAINER Miro Stauder <miro@proxysql.com>
 # set git safe dir
 RUN git config --system --add safe.directory /opt/
 
-# fpm packaging
+# build dependencies
 RUN apt-get -y update && \
-	apt-get -y install ruby ruby-dev && \
-	gem install ffi && \
-	gem install fpm
+	apt-get -y install libboost-all-dev
+
+# fpm packaging
+RUN apt-get -y install ruby ruby-dev && \
+	gem install --no-ri --no-rdoc dotenv -v '2.8.1' && \
+	gem install --no-ri --no-rdoc ffi -v '1.9.14' && \
+	gem install --no-ri --no-rdoc fpm -v '1.12.0'
diff --git a/docker/build/build-ubuntu20/Dockerfile b/docker/build/build-ubuntu20/Dockerfile
index afab4d7..a36d390 100644
--- a/docker/build/build-ubuntu20/Dockerfile
+++ b/docker/build/build-ubuntu20/Dockerfile
@@ -17,5 +17,6 @@ RUN apt-get -y update && \
 
 # fpm packaging
 RUN apt-get -y install ruby ruby-dev && \
-	gem install ffi && \
-	gem install fpm
+	gem install --no-document dotenv -v '2.8.1' && \
+	gem install --no-document ffi -v '1.9.14' && \
+	gem install --no-document fpm -v '1.12.0'