diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 23c09b5..2df8060 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,7 +55,9 @@ jobs:
       - name: Generate XML coverage report
         run: coverage xml
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
-          flags: ${{ matrix.platform }}
+          token: ${{ secrets.CODECOV_TOKEN }}
           env_vars: TOXENV
+          fail_ci_if_error: true
+          flags: ${{ matrix.platform }}
diff --git a/LICENSE.txt b/LICENSE.txt
index f156714..40336c3 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -1,4 +1,4 @@
-Copyright (c) 2011-2023 Akinori Hattori <hattya@gmail.com>
+Copyright (c) 2011-2024 Akinori Hattori <hattya@gmail.com>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal