diff --git a/ci/docker/centos-7-core.dockerfile b/ci/docker/centos-7-core.dockerfile
index ee89540564..5bb7ca385f 100644
--- a/ci/docker/centos-7-core.dockerfile
+++ b/ci/docker/centos-7-core.dockerfile
@@ -8,12 +8,11 @@ SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN yum install -y epel-release centos-release-scl-rh && yum install -y wget curl which && \
     wget -qO- "https://cmake.org/files/v3.14/cmake-3.14.3-Linux-x86_64.tar.gz" | tar --strip-components=1 -xz -C /usr/local && \
     yum install -y ccache make automake git python3-pip libcurl-devel python3-devel boost-static mysql-devel \
-    devtoolset-6-gcc devtoolset-6-gcc-c++ devtoolset-6-gcc-gfortran llvm-toolset-7.0-clang llvm-toolset-7.0-clang-tools-extra mysql lcov \
+    devtoolset-7-gcc devtoolset-7-gcc-c++ devtoolset-7-gcc-gfortran llvm-toolset-7.0-clang llvm-toolset-7.0-clang-tools-extra mysql lcov \
     && \
     rm -rf /var/cache/yum/*
 
-RUN echo "source scl_source enable devtoolset-6" >> /etc/profile.d/devtoolset-6.sh
+RUN echo "source scl_source enable devtoolset-7" >> /etc/profile.d/devtoolset-7.sh
 RUN echo "source scl_source enable llvm-toolset-7.0" >> /etc/profile.d/llvm-toolset-7.sh
-RUN source scl_source enable devtoolset-6 && source scl_source enable llvm-toolset-7.0
 
 ENV CLANG_TOOLS_PATH="/opt/rh/llvm-toolset-7.0/root/usr/bin"
diff --git a/docker-compose.yml b/docker-compose.yml
index 01adaf7292..4ee8d7aac1 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -13,7 +13,7 @@ x-ccache: &ccache
 
 x-command: &cpp-command >
   /bin/bash -c "
-    /milvus/ci/scripts/build.sh -o ${MILVUS_INSTALL_PREFIX} -l -u -c
+    /milvus/ci/scripts/build.sh -t Release -o ${MILVUS_INSTALL_PREFIX} -l -u -c
     /milvus/ci/scripts/coverage.sh -o ${MILVUS_INSTALL_PREFIX} -u root -p 123456 -t mysql"
 
 services:
diff --git a/docker/build_env/cpu/centos7/Dockerfile b/docker/build_env/cpu/centos7/Dockerfile
index 1451652d48..6b3817f849 100644
--- a/docker/build_env/cpu/centos7/Dockerfile
+++ b/docker/build_env/cpu/centos7/Dockerfile
@@ -3,11 +3,11 @@ FROM centos:centos7
 RUN yum install -y epel-release centos-release-scl-rh && yum install -y wget curl which && \
     wget -qO- "https://cmake.org/files/v3.14/cmake-3.14.3-Linux-x86_64.tar.gz" | tar --strip-components=1 -xz -C /usr/local && \
     yum install -y ccache make automake git python3-pip libcurl-devel python3-devel boost-static mysql-devel \
-    devtoolset-6-gcc devtoolset-6-gcc-c++ devtoolset-6-gcc-gfortran llvm-toolset-7.0-clang llvm-toolset-7.0-clang-tools-extra mysql lcov \
+    devtoolset-7-gcc devtoolset-7-gcc-c++ devtoolset-7-gcc-gfortran llvm-toolset-7.0-clang llvm-toolset-7.0-clang-tools-extra mysql lcov \
     && \
     rm -rf /var/cache/yum/*
 
-RUN echo "source scl_source enable devtoolset-6" >> /etc/profile.d/devtoolset-6.sh
+RUN echo "source scl_source enable devtoolset-7" >> /etc/profile.d/devtoolset-7.sh
 RUN echo "source scl_source enable llvm-toolset-7.0" >> /etc/profile.d/llvm-toolset-7.sh
 
 ENV CLANG_TOOLS_PATH="/opt/rh/llvm-toolset-7.0/root/usr/bin"