diff --git a/make-install-script.erb b/make-install-script.erb
index 822cac3..d5be14f 100644
--- a/make-install-script.erb
+++ b/make-install-script.erb
@@ -13,7 +13,7 @@ sudo sh <<'SCRIPT'
 <% if install_info[:channel_version] >= 6 %>
   # add fluent-release to access repository
   distribution=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f2)
-  version=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f4)
+  version=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f4 | cut -d. -f1)
   arch=$(rpm --eval %{_arch})
 <% if install_info[:lts] %>
   curl --silent -o fluent-release.rpm <%= install_info[:base_url] %>/lts/<%= install_info[:channel_version]%>/redhat/${version}/${arch}/fluent-lts-release-<%= install_info[:fluent_release_version] %>.el${version}.noarch.rpm
@@ -92,7 +92,7 @@ sudo sh <<'SCRIPT'
 
 <% if install_info[:channel_version] >= 6 %>
   # add fluent-release to access repository
-  version=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f4)
+  version=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f4 | cut -d. -f1)
   arch=$(rpm --eval %{_arch})
 <% if install_info[:lts] %>
   curl -o fluent-release.rpm <%= install_info[:base_url] %>/lts/<%= install_info[:channel_version]%>/amazon/${version}/${arch}/fluent-lts-release-<%= install_info[:fluent_release_version] %>.amzn${version}.noarch.rpm
diff --git a/sh/install-amazon2023-fluent-package6-lts.sh b/sh/install-amazon2023-fluent-package6-lts.sh
index d2514db..f522704 100644
--- a/sh/install-amazon2023-fluent-package6-lts.sh
+++ b/sh/install-amazon2023-fluent-package6-lts.sh
@@ -11,7 +11,7 @@ sudo -k
 sudo sh <<'SCRIPT'
 
   # add fluent-release to access repository
-  version=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f4)
+  version=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f4 | cut -d. -f1)
   arch=$(rpm --eval %{_arch})
   curl -o fluent-release.rpm https://fluentd.cdn.cncf.io/lts/6/amazon/${version}/${arch}/fluent-lts-release-2025.9.29-1.amzn${version}.noarch.rpm
   if [ -e /etc/yum.repos.d/fluent-package-lts.repo ]; then
diff --git a/sh/install-amazon2023-fluent-package6.sh b/sh/install-amazon2023-fluent-package6.sh
index 5856cae..df4a9d6 100644
--- a/sh/install-amazon2023-fluent-package6.sh
+++ b/sh/install-amazon2023-fluent-package6.sh
@@ -11,7 +11,7 @@ sudo -k
 sudo sh <<'SCRIPT'
 
   # add fluent-release to access repository
-  version=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f4)
+  version=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f4 | cut -d. -f1)
   arch=$(rpm --eval %{_arch})
   curl -o fluent-release.rpm https://fluentd.cdn.cncf.io/6/amazon/${version}/${arch}/fluent-release-2025.9.29-1.amzn${version}.noarch.rpm
   if [ -e /etc/yum.repos.d/fluent-package.repo ]; then
diff --git a/sh/install-redhat-fluent-package6-lts.sh b/sh/install-redhat-fluent-package6-lts.sh
index 0b20621..773739a 100644
--- a/sh/install-redhat-fluent-package6-lts.sh
+++ b/sh/install-redhat-fluent-package6-lts.sh
@@ -11,7 +11,7 @@ sudo -k
 sudo sh <<'SCRIPT'
   # add fluent-release to access repository
   distribution=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f2)
-  version=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f4)
+  version=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f4 | cut -d. -f1)
   arch=$(rpm --eval %{_arch})
   curl --silent -o fluent-release.rpm https://fluentd.cdn.cncf.io/lts/6/redhat/${version}/${arch}/fluent-lts-release-2025.9.29-1.el${version}.noarch.rpm
   if [ -e /etc/yum.repos.d/fluent-package-lts.repo ]; then
diff --git a/sh/install-redhat-fluent-package6.sh b/sh/install-redhat-fluent-package6.sh
index 1d7e201..fb02aa6 100644
--- a/sh/install-redhat-fluent-package6.sh
+++ b/sh/install-redhat-fluent-package6.sh
@@ -11,7 +11,7 @@ sudo -k
 sudo sh <<'SCRIPT'
   # add fluent-release to access repository
   distribution=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f2)
-  version=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f4)
+  version=$(cat /etc/system-release-cpe | awk '{print substr($1, index($1, "o"))}' | cut -d: -f4 | cut -d. -f1)
   arch=$(rpm --eval %{_arch})
   curl --silent -o fluent-release.rpm https://fluentd.cdn.cncf.io/6/redhat/${version}/${arch}/fluent-release-2025.9.29-1.el${version}.noarch.rpm
   if [ -e /etc/yum.repos.d/fluent-package.repo ]; then