diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 642ad67..db60a48 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [ '1.18', '1.17']
+        go: ["1.23", "1.24"]
     name: Test ${{ matrix.go }}
     steps:
       - name: Checkout
diff --git a/go.mod b/go.mod
index 096ec50..b2895d9 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/fujimura/git-gsub
 
-go 1.14
+go 1.24
 
 require (
 	github.com/iancoleman/strcase v0.1.1
diff --git a/main.go b/main.go
index 1b79614..f3c3d0c 100644
--- a/main.go
+++ b/main.go
@@ -147,9 +147,9 @@ func (cli *CLI) Run(_args []string) int {
 	}
 
 	if len(args) < 2 {
-		fmt.Fprintf(cli.errStream, "Usage git gsub [options] FROM TO [PATHS]\n")
-		fmt.Fprintf(cli.errStream, "\nOptions:\n")
-		fmt.Fprintf(cli.errStream, flag.CommandLine.FlagUsages())
+		fmt.Fprint(cli.errStream, "Usage git gsub [options] FROM TO [PATHS]\n")
+		fmt.Fprint(cli.errStream, "\nOptions:\n")
+		fmt.Fprint(cli.errStream, flag.CommandLine.FlagUsages())
 		return 1
 	}