diff --git a/ChangeLog b/ChangeLog
index baa5217..4b9fb9d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+20231008
+*Check the pkg command if it is installed or not.
+
 20230922
 *Improved FLAVOR handling when installing new packages.
  See example section in pkg_replace(1).
diff --git a/pkg_replace.1 b/pkg_replace.1
index f4f5a5d..d21f33e 100644
--- a/pkg_replace.1
+++ b/pkg_replace.1
@@ -1,7 +1,7 @@
 .\" $Id: pkg_replace.1,v 1.2 2007/01/25 12:25:56 securedog Exp $
 .\"
-.\" Modified by Ken DEGUCHI (September 22, 2023)"
-.Dd September 22, 2023
+.\" Modified by Ken DEGUCHI (October  8, 2023)"
+.Dd October  8, 2023
 .Dt PKG_REPLACE 1
 .Os
 .Sh NAME
diff --git a/pkg_replace.sh b/pkg_replace.sh
index 27f0986..e21e923 100644
--- a/pkg_replace.sh
+++ b/pkg_replace.sh
@@ -21,7 +21,7 @@
 # - Cleanup Code
 
 
-PKG_REPLACE_VERSION=20230922
+PKG_REPLACE_VERSION=20231008
 PKG_REPLACE_CONFIG=FreeBSD
 
 usage() {
@@ -1657,6 +1657,8 @@ do_version() {
 main() {
 	local ARG ARGV jobs pids cnt X
 
+	isempty $(which pkg-static) && { warn 'pkg not found. Please install the pkg command.'; exit 1; }
+
 	init_variables
 	init_options
 	parse_options ${1+"$@"}