diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index da2b484..258a6cf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -64,19 +64,26 @@ jobs:
           - rockylinux:9
           - rockylinux:8
           - centos:centos7
+          - fedora:39
           - fedora:38
-          - fedora:37
+          - alpine:3.19
           - alpine:3.18
 
     container:
       image: ${{ matrix.container }}
 
     steps:
+      # [NOTE]
+      # actions/checkout@v3 uses nodejs v16 and will be deprecated.
+      # However, @v4 does not work on centos7 depending on the glibc version,
+      # so we will continue to use @v3.
       #
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your
-      # job can access it
-      #
-      - name: Checkout sources
+      - name: Checkout source code(other than centos7)
+        if: matrix.container != 'centos:centos7'
+        uses: actions/checkout@v4
+
+      - name: Checkout source code(only centos7)
+        if: matrix.container == 'centos:centos7'
         uses: actions/checkout@v3
 
       #
diff --git a/.github/workflows/ostypevars.sh b/.github/workflows/ostypevars.sh
index 94db5bf..9f1418b 100644
--- a/.github/workflows/ostypevars.sh
+++ b/.github/workflows/ostypevars.sh
@@ -201,8 +201,8 @@ elif [ "${CI_OSTYPE}" = "centos:7" ] || [ "${CI_OSTYPE}" = "centos:centos7" ]; t
 	PKG_EXT="rpm"
 	IS_OS_CENTOS=1
 
-elif [ "${CI_OSTYPE}" = "fedora:38" ]; then
-	DIST_TAG="fedora/38"
+elif [ "${CI_OSTYPE}" = "fedora:39" ]; then
+	DIST_TAG="fedora/39"
 	INSTALL_PKG_LIST="git autoconf automake gcc-c++ make pkgconfig redhat-rpm-config rpm-build ruby-devel rubygems procps"
 	INSTALLER_BIN="dnf"
 	UPDATE_CMD="update"
@@ -215,8 +215,8 @@ elif [ "${CI_OSTYPE}" = "fedora:38" ]; then
 	PKG_EXT="rpm"
 	IS_OS_FEDORA=1
 
-elif [ "${CI_OSTYPE}" = "fedora:37" ]; then
-	DIST_TAG="fedora/37"
+elif [ "${CI_OSTYPE}" = "fedora:38" ]; then
+	DIST_TAG="fedora/38"
 	INSTALL_PKG_LIST="git autoconf automake gcc-c++ make pkgconfig redhat-rpm-config rpm-build ruby-devel rubygems procps"
 	INSTALLER_BIN="dnf"
 	UPDATE_CMD="update"
@@ -229,6 +229,20 @@ elif [ "${CI_OSTYPE}" = "fedora:37" ]; then
 	PKG_EXT="rpm"
 	IS_OS_FEDORA=1
 
+elif [ "${CI_OSTYPE}" = "alpine:3.19" ]; then
+	DIST_TAG="alpine/v3.19"
+	INSTALL_PKG_LIST="bash sudo alpine-sdk automake autoconf util-linux-misc musl-locales ruby-dev procps coreutils k2hr3-cli"
+	INSTALLER_BIN="apk"
+	UPDATE_CMD="update"
+	UPDATE_CMD_ARG="--no-progress"
+	INSTALL_CMD="add"
+	INSTALL_CMD_ARG="--no-progress --no-cache"
+	INSTALL_AUTO_ARG=""
+	INSTALL_QUIET_ARG="-q"
+	PKG_OUTPUT_DIR="apk_build"
+	PKG_EXT="apk"
+	IS_OS_ALPINE=1
+
 elif [ "${CI_OSTYPE}" = "alpine:3.18" ]; then
 	DIST_TAG="alpine/v3.18"
 	INSTALL_PKG_LIST="bash sudo alpine-sdk automake autoconf util-linux-misc musl-locales ruby-dev procps coreutils k2hr3-cli"
diff --git a/Makefile.am b/Makefile.am
index a2b72a5..e79a968 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -80,13 +80,14 @@ SHELLCHECK_FILES_SH			= `grep -ril '^\#!/bin/sh' . | grep '\.sh' | grep -v '\.sh
 SHELLCHECK_FILES_INCLUDE_SH	= `grep -Lir '^\#!/bin/sh' . | grep '\.sh' | grep -v '\.sh\.' | grep -v '/\.git/' | grep -v '/rpmbuild/' | grep -v '/debian_build/' | grep -v '/autom4te.cache/' | grep -v '/m4/' | tr '\n' ' '`
 
 shellcheck:
-	@if type shellcheck > /dev/null 2>&1; then \
+	@set -e; \
+	if type shellcheck > /dev/null 2>&1; then \
 		echo "*** Check all files with ShellCheck"; \
 		if [ -n "$(SHELLCHECK_FILES_SH)" ]; then \
-			LC_ALL=C.UTF-8 $(SHELLCHECK_CMD) $(SHELLCHECK_BASE_OPT) $(SHELLCHECK_IGN_OPT) $(SHELLCHECK_FILES_SH) || exit 1; \
+			LC_ALL=C.UTF-8 $(SHELLCHECK_CMD) $(SHELLCHECK_BASE_OPT) $(SHELLCHECK_IGN_OPT) $(SHELLCHECK_FILES_SH); \
 		fi; \
 		if [ -n "$(SHELLCHECK_FILES_INCLUDE_SH)" ]; then \
-			LC_ALL=C.UTF-8 $(SHELLCHECK_CMD) $(SHELLCHECK_BASE_OPT) $(SHELLCHECK_INCLUDE_IGN_OPT) $(SHELLCHECK_FILES_INCLUDE_SH) || exit 1; \
+			LC_ALL=C.UTF-8 $(SHELLCHECK_CMD) $(SHELLCHECK_BASE_OPT) $(SHELLCHECK_INCLUDE_IGN_OPT) $(SHELLCHECK_FILES_INCLUDE_SH); \
 		fi; \
 		echo "   -> No error was detected."; \
 		echo ""; \