diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bf3224e..e3ae835 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,11 +16,13 @@ jobs:
         go:
         - '^1.20'
         - '^1.21'
+        - '^1.22'
+        - '^1.23'
     steps:
       - name: Check out repository code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Set up Go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go }}
       - name: vet
@@ -32,7 +34,7 @@ jobs:
       - name: Test Coverage (pkg)
         run: go test ./... -race -coverprofile=${{ steps.vars.outputs.coverage_txt }}
       - name: Upload coverage
-        if: ${{ matrix.go == '^1.21' }}
+        if: ${{ matrix.go == '^1.23' }}
         uses: codecov/codecov-action@v3
         with:
           files: ${{ steps.vars.outputs.coverage_txt }}
diff --git a/LICENSE b/LICENSE
index 58ccadd..fd850bb 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2023 codehex
+Copyright (c) 2024 codehex
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000..ecb7861
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,2 @@
+ignore:
+  - "tz"
\ No newline at end of file
diff --git a/go.mod b/go.mod
index d9abc5d..f2443c4 100644
--- a/go.mod
+++ b/go.mod
@@ -1,7 +1,7 @@
 module github.com/Code-Hex/synchro
 
-go 1.20.0
+go 1.23.4
 
-require github.com/google/go-cmp v0.5.9
+require github.com/google/go-cmp v0.6.0
 
-require github.com/itchyny/timefmt-go v0.1.5
+require github.com/itchyny/timefmt-go v0.1.6
diff --git a/go.sum b/go.sum
index 29f8b12..11195e7 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,4 @@
-github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
-github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/itchyny/timefmt-go v0.1.5 h1:G0INE2la8S6ru/ZI5JecgyzbbJNs5lG1RcBqa7Jm6GE=
-github.com/itchyny/timefmt-go v0.1.5/go.mod h1:nEP7L+2YmAbT2kZ2HfSs1d8Xtw9LY8D2stDBckWakZ8=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/itchyny/timefmt-go v0.1.6 h1:ia3s54iciXDdzWzwaVKXZPbiXzxxnv1SPGFfM/myJ5Q=
+github.com/itchyny/timefmt-go v0.1.6/go.mod h1:RRDZYC5s9ErkjQvTvvU7keJjxUYzIISJGxm9/mAERQg=
diff --git a/time_test.go b/time_test.go
index c1aa9e8..7fe8a1c 100644
--- a/time_test.go
+++ b/time_test.go
@@ -632,5 +632,5 @@ func ExampleStrptime() {
 	fmt.Println("error", err) // Returns an error as the layout is not a valid time value
 	// Output:
 	// 2023-09-02 14:09:56 +0900 JST
-	// error failed to parse "invalid" with "%Y": cannot parse %Y
+	// error failed to parse "invalid" with "%Y": cannot parse "%Y"
 }