diff --git a/.github/workflows/push_gem.yml b/.github/workflows/push_gem.yml
new file mode 100644
index 0000000..73c515c
--- /dev/null
+++ b/.github/workflows/push_gem.yml
@@ -0,0 +1,46 @@
+name: Publish gem to rubygems.org
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+permissions:
+  contents: read
+
+jobs:
+  push:
+    if: github.repository == 'ruby/logger'
+    runs-on: ubuntu-latest
+
+    environment:
+      name: rubygems.org
+      url: https://rubygems.org/gems/logger
+
+    permissions:
+      contents: write
+      id-token: write
+
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@0080882f6c36860b6ba35c610c98ce87d4e2f26f # v2.10.2
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@a6e6f86333f0a2523ece813039b8b4be04560854 # v1.190.0
+        with:
+          bundler-cache: true
+          ruby-version: ruby
+
+      - name: Publish to RubyGems
+        uses: rubygems/release-gem@9e85cb11501bebc2ae661c1500176316d3987059 # v1.1.0
+
+      - name: Create GitHub release
+        run: |
+          tag_name="$(git describe --tags --abbrev=0)"
+          gh release create "${tag_name}" --verify-tag --generate-notes
+        env:
+          GITHUB_TOKEN: ${{ secrets.MATZBOT_GITHUB_WORKFLOW_TOKEN }}
diff --git a/README.md b/README.md
index 649684f..ceb1a21 100644
--- a/README.md
+++ b/README.md
@@ -101,4 +101,4 @@ Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/l
 
 ## License
 
-The gem is available as open source under the terms of the [BSD-2-Clause](LICENSE.txt).
+The gem is available as open source under the terms of the [BSD-2-Clause](BSDL).
diff --git a/Rakefile b/Rakefile
index 35dd06e..d630ceb 100644
--- a/Rakefile
+++ b/Rakefile
@@ -14,7 +14,7 @@ require "rdoc/task"
 RDoc::Task.new do |doc|
   doc.main   = "README.md"
   doc.title  = "Logger -- Ruby Standard Logger"
-  doc.rdoc_files = FileList.new %w[README.md lib LICENSE.txt]
+  doc.rdoc_files = FileList.new %w[README.md lib BSDL COPYING]
   doc.rdoc_dir = "html"
 end
 
diff --git a/lib/logger.rb b/lib/logger.rb
index 4735209..8d6e0d7 100644
--- a/lib/logger.rb
+++ b/lib/logger.rb
@@ -381,7 +381,7 @@ class Logger
 
   # Logging severity threshold (e.g. <tt>Logger::INFO</tt>).
   def level
-    level_override[Fiber.current] || @level
+    level_override[level_key] || @level
   end
 
   # Sets the log level; returns +severity+.
@@ -406,14 +406,14 @@ def level=(severity)
   #     logger.debug { "Hello" }
   #   end
   def with_level(severity)
-    prev, level_override[Fiber.current] = level, Severity.coerce(severity)
+    prev, level_override[level_key] = level, Severity.coerce(severity)
     begin
       yield
     ensure
       if prev
-        level_override[Fiber.current] = prev
+        level_override[level_key] = prev
       else
-        level_override.delete(Fiber.current)
+        level_override.delete(level_key)
       end
     end
   end
@@ -751,6 +751,10 @@ def level_override
     @level_override ||= {}
   end
 
+  def level_key
+    Fiber.current
+  end
+
   def format_message(severity, datetime, progname, msg)
     (@formatter || @default_formatter).call(severity, datetime, progname, msg)
   end
diff --git a/lib/logger/version.rb b/lib/logger/version.rb
index 2a0801b..15fc5bc 100644
--- a/lib/logger/version.rb
+++ b/lib/logger/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 class Logger
-  VERSION = "1.6.1"
+  VERSION = "1.6.2"
 end
diff --git a/logger.gemspec b/logger.gemspec
index 5e8232e..ed55111 100644
--- a/logger.gemspec
+++ b/logger.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = "https://github.com/ruby/logger"
   spec.licenses      = ["Ruby", "BSD-2-Clause"]
 
-  spec.files         = Dir.glob("lib/**/*.rb") + ["logger.gemspec"]
+  spec.files         = Dir.glob("lib/**/*.rb") + ["logger.gemspec", "BSDL", "COPYING"]
   spec.require_paths = ["lib"]
 
   spec.required_ruby_version = ">= 2.5.0"
diff --git a/test/logger/test_severity.rb b/test/logger/test_severity.rb
index e1069c8..fb26939 100644
--- a/test/logger/test_severity.rb
+++ b/test/logger/test_severity.rb
@@ -26,7 +26,7 @@ def test_level_assignment
     end
   end
 
-  def test_thread_local_level
+  def test_fiber_local_level
     logger = Logger.new(nil)
     logger.level = INFO # default level
     other = Logger.new(nil)
@@ -40,14 +40,50 @@ def test_thread_local_level
       logger.with_level(DEBUG) do # verify reentrancy
         assert_equal(logger.level, DEBUG)
 
-        Thread.new do
+        Fiber.new do
           assert_equal(logger.level, INFO)
           logger.with_level(:WARN) do
             assert_equal(other.level, ERROR)
             assert_equal(logger.level, WARN)
           end
           assert_equal(logger.level, INFO)
-        end.join
+        end.resume
+
+        assert_equal(logger.level, DEBUG)
+      end
+      assert_equal(logger.level, WARN)
+    end
+    assert_equal(logger.level, INFO)
+  end
+
+  def test_thread_local_level
+    subclass = Class.new(Logger) do
+      def level_key
+        Thread.current
+      end
+    end
+
+    logger = subclass.new(nil)
+    logger.level = INFO # default level
+    other = subclass.new(nil)
+    other.level = ERROR # default level
+
+    assert_equal(other.level, ERROR)
+    logger.with_level(:WARN) do
+      assert_equal(other.level, ERROR)
+      assert_equal(logger.level, WARN)
+
+      logger.with_level(DEBUG) do # verify reentrancy
+        assert_equal(logger.level, DEBUG)
+
+        Fiber.new do
+          assert_equal(logger.level, DEBUG)
+          logger.with_level(:WARN) do
+            assert_equal(other.level, ERROR)
+            assert_equal(logger.level, WARN)
+          end
+          assert_equal(logger.level, DEBUG)
+        end.resume
 
         assert_equal(logger.level, DEBUG)
       end