diff --git a/core/Cross.toml b/core/Cross.toml
deleted file mode 100644
index cbf43363b..000000000
--- a/core/Cross.toml
+++ /dev/null
@@ -1,2 +0,0 @@
-[target.x86_64-unknown-linux-gnu]
-image = "comet_build_env_centos7:1.0"
\ No newline at end of file
diff --git a/core/comet_build_env_centos7.dockerfile b/core/comet_build_env_centos7.dockerfile
deleted file mode 100644
index 026facd49..000000000
--- a/core/comet_build_env_centos7.dockerfile
+++ /dev/null
@@ -1,36 +0,0 @@
-FROM centos:7
-RUN ulimit -n 65536
-
-# install common tools
-#RUN yum update -y
-RUN yum install -y centos-release-scl epel-release
-RUN rm -f /var/lib/rpm/__db* && rpm --rebuilddb 
-RUN yum clean all && rm -rf /var/cache/yum
-RUN yum makecache
-RUN yum install -y -v git
-RUN yum install -y -v libzip unzip wget cmake3 openssl-devel
-# install protoc
-RUN wget -O /protobuf-21.7-linux-x86_64.zip https://github.com/protocolbuffers/protobuf/releases/download/v21.7/protoc-21.7-linux-x86_64.zip
-RUN mkdir /protobuf-bin && (cd /protobuf-bin && unzip /protobuf-21.7-linux-x86_64.zip)
-RUN echo 'export PATH="$PATH:/protobuf-bin/bin"' >> ~/.bashrc
-
-
-# install gcc-11
-RUN yum install -y devtoolset-11-gcc devtoolset-11-gcc-c++
-RUN echo '. /opt/rh/devtoolset-11/enable' >> ~/.bashrc
-
-# install rust nightly toolchain
-RUN curl https://sh.rustup.rs > /rustup-init
-RUN chmod +x /rustup-init
-RUN /rustup-init -y --default-toolchain nightly-2023-08-01-x86_64-unknown-linux-gnu
-
-RUN echo 'source $HOME/.cargo/env' >> ~/.bashrc
-
-# install java
-RUN yum install -y java-1.8.0-openjdk java-1.8.0-openjdk-devel
-RUN echo 'export JAVA_HOME="/usr/lib/jvm/java-1.8.0-openjdk"' >> ~/.bashrc
-
-# install maven
-RUN yum install -y rh-maven35
-RUN echo 'source /opt/rh/rh-maven35/enable' >> ~/.bashrc
-RUN yum -y install gcc automake autoconf libtool make