diff --git a/Makefile b/Makefile
index 3b95d2e..9458e4d 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,14 @@
 NAME := lsec2
-SRCS := $(shell find . -type f -name '*.go' | \grep -v 'vendor')
-PACKAGES := $(shell ./scripts/_packages.sh)
 PROF_DIR := ./.profile
-GOVERSION := $(shell go version | awk '{print $$3;}')
+AWS_SDK_GO_PKG := github.com/aws/aws-sdk-go
+
+# Note: NOT use lazy initializer because make is unstable.
+#SRCS = $(eval SRCS := $(shell find . -type f -name '*.go' | \grep -v 'vendor'))$(SRCS)
+#PACKAGES = $(eval PACKAGES := $(shell ./scripts/_packages.sh))$(PACKAGES)
+#GOVERSION = $(eval GOVERSION := $(shell go version | awk '{print $$3;}'))$(GOVERSION)
+SRCS = $(shell find . -type f -name '*.go' | \grep -v 'vendor')
+PACKAGES = $(shell ./scripts/_packages.sh)
+GOVERSION = $(shell go version | awk '{print $$3;}')
 
 .DEFAULT_GOAL := bin/$(NAME)
 
@@ -16,6 +22,12 @@ mod-dl:
 mod-tidy:
 	@GO111MODULE=on go mod tidy
 
+list-versions-aws-sdk-go:
+	@go list -u -m -versions $(AWS_SDK_GO_PKG) | tr ' ' '\n'
+
+update-aws-sdk-go:
+	@read -p 'Input Module Query(e.g. "<v1.20")?: ' query; echo query=$$query; GO111MODULE=on go get $(AWS_SDK_GO_PKG)@''$$query''
+
 bin/$(NAME): $(SRCS)
 	@./scripts/build.sh bin/$(NAME)
 
@@ -69,6 +81,7 @@ vendor-build:
 lint-travis:
 	@travis lint --org --debug .travis.yml
 
+# Note: require "brew install rpmbuild" on OS X
 test-goreleaser:
 	@GOVERSION=$(GOVERSION) goreleaser release --snapshot --skip-publish --rm-dist
 
@@ -82,3 +95,6 @@ clean:
 	@rm -fr dist pkg
 	@find . -name '*.test' -delete
 	@rm -fr $(PROF_DIR)
+
+mod-clean:
+	@go clean -modcache
diff --git a/cmd/lsec2/version/version.go b/cmd/lsec2/version/version.go
index 1b5339e..f989eb5 100644
--- a/cmd/lsec2/version/version.go
+++ b/cmd/lsec2/version/version.go
@@ -1,4 +1,4 @@
 package version
 
 // VERSION says my version number
-const VERSION = "0.2.7"
+const VERSION = "0.2.8"
diff --git a/cmd/lsec2/version/version_test.go b/cmd/lsec2/version/version_test.go
index a65d96a..1c9030d 100644
--- a/cmd/lsec2/version/version_test.go
+++ b/cmd/lsec2/version/version_test.go
@@ -7,8 +7,8 @@ import (
 )
 
 func TestVersion(t *testing.T) {
-	exp := "0.2.7"
-	if VERSION != "0.2.7" {
+	exp := "0.2.8"
+	if VERSION != "0.2.8" {
 		t.Errorf("expected: %#v, but actual: %#v", exp, VERSION)
 	}
 }
diff --git a/go.mod b/go.mod
index 57a649e..27d116d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,7 +1,7 @@
 module github.com/goldeneggg/lsec2
 
 require (
-	github.com/aws/aws-sdk-go v1.17.14
+	github.com/aws/aws-sdk-go v1.19.24
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fatih/color v1.7.0
 	github.com/mattn/go-colorable v0.1.1 // indirect
diff --git a/go.sum b/go.sum
index 80a4508..8ea7407 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-github.com/aws/aws-sdk-go v1.17.14 h1:IjqZDIQoLyZ48A93BxVrZOaIGgZPRi4nXt6WQUMJplY=
-github.com/aws/aws-sdk-go v1.17.14/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
+github.com/aws/aws-sdk-go v1.19.24 h1:qOIYaFxcFg07Vdn799ERpGiuUUIEi5MQ2vYib3CNMp4=
+github.com/aws/aws-sdk-go v1.19.24/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=