diff --git a/.github/workflows/macos-test.yaml b/.github/workflows/macos-test.yaml
new file mode 100644
index 0000000000..7729f48e86
--- /dev/null
+++ b/.github/workflows/macos-test.yaml
@@ -0,0 +1,30 @@
+name: Testing on macOS
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby-version: ['head', '2.7']
+        os: [macos-latest]
+        experimental: [true]
+
+    name: Unit testing with Ruby ${{ matrix.ruby-version }} on ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+      - name: Install dependencies
+        run: bundle install
+      - name: Run tests
+        run: bundle exec rake test
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 4d06dc90eb..0000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,77 +0,0 @@
-language: ruby
-cache: bundler
-
-# script: bundle exec rake test TESTOPTS=-v
-
-# http://rubies.travis-ci.org/
-# See here for osx_image -> OSX versions: https://docs.travis-ci.com/user/languages/objective-c
-matrix:
-  include:
-    - rvm: 2.4.9
-      os: linux
-      env: USE_CAPNG=false
-    - rvm: 2.4.9
-      os: linux-ppc64le
-      env: USE_CAPNG=false
-    - rvm: 2.5.7
-      os: linux
-      env: USE_CAPNG=false
-    - rvm: 2.5.7
-      os: linux
-      arch: s390x
-      dist: xenial
-      env: USE_CAPNG=false
-    - rvm: 2.6.5
-      os: linux
-      env: USE_CAPNG=false
-    - rvm: 2.6.6
-      os: linux
-      env: USE_CAPNG=true
-    - rvm: 2.7.0
-      os: linux
-      env: USE_CAPNG=false
-    - rvm: ruby-head
-      os: linux
-      env: USE_CAPNG=false
-    - rvm: ruby-head
-      os: linux-ppc64le
-      env: USE_CAPNG=false
-    - rvm: 2.4.6
-      os: osx
-      osx_image: xcode8.3 # OSX 10.12
-      env: USE_CAPNG=false
-    - rvm: ruby-head
-      os: osx
-      osx_image: xcode8.3 # OSX 10.12
-      env: USE_CAPNG=false
-  allow_failures:
-    - rvm: 2.4.6
-      os: osx
-      osx_image: xcode8.3
-      env: USE_CAPNG=false
-    - rvm: 2.5.7
-      os: linux
-      arch: s390x
-      dist: xenial
-      env: USE_CAPNG=false
-    - rvm: ruby-head
-      env: USE_CAPNG=false
-
-branches:
-  only:
-    - master
-
-before_install: |
-  gem update --system=3.1.2
-  if [[ x"${USE_CAPNG}" == "xtrue" ]]; then
-    echo 'gem "capng_c"' >> Gemfile.local
-  fi
-
-sudo: false
-dist: trusty # for TLSv1.2 support
-
-addons:
-  apt:
-    packages:
-      - libgmp3-dev
-      - libcap-ng-dev
diff --git a/test/plugin_helper/test_child_process.rb b/test/plugin_helper/test_child_process.rb
index 8d14da5aee..e20b44b636 100644
--- a/test/plugin_helper/test_child_process.rb
+++ b/test/plugin_helper/test_child_process.rb
@@ -1,3 +1,4 @@
+# coding: utf-8
 require_relative '../helper'
 require 'fluent/plugin_helper/child_process'
 require 'fluent/plugin/base'
@@ -269,10 +270,12 @@ def configure(conf)
     Timeout.timeout(TEST_DEADLOCK_TIMEOUT) do
       ran = false
       @d.child_process_execute(:t4, "ruby -e 'Signal.trap(:TERM, nil); while sleep 0.1; puts 1; STDOUT.flush rescue nil; end'", mode: [:read]) do |io|
-        m.lock
-        ran = true
         begin
           while line = io.readline
+            unless ran
+              m.lock
+              ran = true
+            end
             ary << line
           end
         rescue