diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f02cd5c3a..40828d86b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -61,7 +61,6 @@ jobs:
           - fedora:39
           - opensuse/leap:15
           - alpine:3.20
-          - centos:centos7
 
     container:
       image: ${{ matrix.container }}
@@ -72,12 +71,6 @@ jobs:
       # Installation special environment variables for debian and ubuntu.
       #
       DEBIAN_FRONTEND:  noninteractive
-      # [NOTE]
-      # actions/checkout uses node20, but can only run up to node16 on centos7.
-      # (glibc 2.27 or later is required to use node20)
-      # This is a temporary solution and will be removed when centos7 support is discontinued.
-      #
-      ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: ${{ matrix.container == 'centos:centos7' && true || false }}
 
     steps:
       # [NOTE]
@@ -88,18 +81,9 @@ jobs:
         run: |
           zypper install -y tar gzip
 
-      # [NOTE]
-      # Use actions/checkout@v4 except for centos7.
-      # On centos7, we need to run actions/checkout@v3 and configure it to use node16.
-      #
-      - name: Checkout source code(other than centos7)
-        if: matrix.container != 'centos:centos7'
+      - name: Checkout source code
         uses: actions/checkout@v4
 
-      - name: Checkout source code(only centos7)
-        if: matrix.container == 'centos:centos7'
-        uses: actions/checkout@v3
-
       # [NOTE]
       # Matters that depend on OS:VERSION are determined and executed in the following script.
       # Please note that the option to configure (CONFIGURE_OPTIONS) is set in the environment variable.
diff --git a/.github/workflows/linux-ci-helper.sh b/.github/workflows/linux-ci-helper.sh
index 3ae18b4df..359c0a0d4 100755
--- a/.github/workflows/linux-ci-helper.sh
+++ b/.github/workflows/linux-ci-helper.sh
@@ -171,77 +171,6 @@ elif [ "${CONTAINER_FULLNAME}" = "rockylinux:8" ]; then
     #
     SHELLCHECK_DIRECT_INSTALL=1
 
-elif [ "${CONTAINER_FULLNAME}" = "centos:centos7" ]; then
-    # [NOTE]
-    # CentOS 7 will reach EOL on June 30, 2024.
-    # After EOL, we will prepare the environment for building and testing using the Vault repository.
-    # The following process switches from the EOL repository to Vault.
-    #
-    grep -v '^enabled=' /etc/yum.repos.d/CentOS-Base.repo | sed -e 's|gpgcheck=1|gpgcheck=1\nenabled=0|g' > /tmp/CentOS-Base.repo
-    cat /tmp/CentOS-Base.repo > /etc/yum.repos.d/CentOS-Base.repo
-
-    {
-        #
-        # CentOS-Vault.repo does not have C7.9.2009 entry, so add it.
-        #
-        echo ''
-        echo '# C7.9.2009'
-        echo '[C7.9.2009-base]'
-        echo 'name=CentOS-7.9.2009 - Base'
-        echo "baseurl=http://vault.centos.org/7.9.2009/os/\$basearch/"
-        echo 'gpgcheck=1'
-        echo 'gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7'
-        echo 'enabled=1'
-        echo ''
-        echo '[C7.9.2009-updates]'
-        echo 'name=CentOS-7.9.2009 - Updates'
-        echo "baseurl=http://vault.centos.org/7.9.2009/updates/\$basearch/"
-        echo 'gpgcheck=1'
-        echo 'gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7'
-        echo 'enabled=1'
-        echo ''
-        echo '[C7.9.2009-extras]'
-        echo 'name=CentOS-7.9.2009 - Extras'
-        echo "baseurl=http://vault.centos.org/7.9.2009/extras/\$basearch/"
-        echo 'gpgcheck=1'
-        echo 'gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7'
-        echo 'enabled=1'
-        echo ''
-        echo '[C7.9.2009-centosplus]'
-        echo 'name=CentOS-7.9.2009 - CentOSPlus'
-        echo "baseurl=http://vault.centos.org/7.9.2009/centosplus/\$basearch/"
-        echo 'gpgcheck=1'
-        echo 'gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7'
-        echo 'enabled=1'
-        echo ''
-        echo '[C7.9.2009-fasttrack]'
-        echo 'name=CentOS-7.9.2009 - Fasttrack'
-        echo "baseurl=http://vault.centos.org/7.9.2009/fasttrack/\$basearch/"
-        echo 'gpgcheck=1'
-        echo 'gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7'
-        echo 'enabled=1'
-        echo ''
-    } >> /etc/yum.repos.d/CentOS-Base.repo
-
-    yum clean all
-    yum update -q -y
-    #
-    # Finish change package repo to Vault.
-    #
-
-    PACKAGE_MANAGER_BIN="yum"
-    PACKAGE_UPDATE_OPTIONS="update -y"
-    PACKAGE_INSTALL_OPTIONS="install -y"
-
-    # [NOTE]
-    # ShellCheck version(0.3.8) is too low to check.
-    # And in this version, it cannot be passed due to following error.
-    # "shellcheck: ./test/integration-test-main.sh: hGetContents: invalid argument (invalid byte sequence)"
-    #
-    INSTALL_PACKAGES="curl-devel fuse fuse-devel gcc libstdc++-devel llvm-toolset-7-clang-tools-extra gcc-c++ glibc-langpack-en java-11-openjdk-headless libxml2-devel mailcap git automake make openssl openssl-devel attr curl python3 epel-release unzip"
-    INSTALL_CHECKER_PKGS="cppcheck jq"
-    INSTALL_CHECKER_PKG_OPTIONS="--enablerepo=epel"
-
 elif [ "${CONTAINER_FULLNAME}" = "fedora:40" ]; then
     PACKAGE_MANAGER_BIN="dnf"
     PACKAGE_UPDATE_OPTIONS="update -y -qq"