diff --git a/.github/workflows/experimental-workflow.yml b/.github/workflows/experimental-workflow.yml
index 4b3cc93a..e1816394 100644
--- a/.github/workflows/experimental-workflow.yml
+++ b/.github/workflows/experimental-workflow.yml
@@ -25,7 +25,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macos-latest]
         php-versions: ['8.0']
     steps:
       - name: Checkout
diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index e0a398ad..35927cc6 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -23,7 +23,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macos-latest]
         php-versions: ['5.6', '7.0', '7.1', '7.2', '7.3', '7.4']
     steps:
       - name: Checkout
diff --git a/README.md b/README.md
index 16c07f49..88214902 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ Setup PHP with required extensions, php.ini configuration, code-coverage support
 |Windows Server 2019|`windows-latest` or `windows-2019`|
 |Ubuntu 18.04|`ubuntu-latest` or `ubuntu-18.04`|
 |Ubuntu 16.04|`ubuntu-16.04`|
-|macOS X Catalina 10.15|`macOS-latest` or `macOS-10.15`|
+|macOS X Catalina 10.15|`macos-latest` or `macOS-10.15`|
 
 ## :heavy_plus_sign: PHP Extension Support
 - On `ubuntu` by default extensions which are available as a package can be installed. If the extension is not available as a package but it is on `PECL`, it can be installed by specifying `pecl` in the tools input.
@@ -185,7 +185,7 @@ jobs:
     runs-on: ${{ matrix.operating-system }}
     strategy:
       matrix:
-        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macos-latest]
         php-versions: ['5.6', '7.0', '7.1', '7.2', '7.3', '7.4']
     name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
     steps:
diff --git a/examples/cakephp.yml b/examples/cakephp.yml
index e296a41f..14a252cf 100644
--- a/examples/cakephp.yml
+++ b/examples/cakephp.yml
@@ -6,7 +6,7 @@ jobs:
   tests:
     strategy:
       matrix:
-        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macos-latest]
         php-versions: ['7.2', '7.3', '7.4']
     runs-on: ${{ matrix.operating-system }}
     steps:
diff --git a/examples/codeigniter.yml b/examples/codeigniter.yml
index 5ce0f81c..2c0c535d 100644
--- a/examples/codeigniter.yml
+++ b/examples/codeigniter.yml
@@ -5,7 +5,7 @@ jobs:
   build:
     strategy:
       matrix:
-        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macos-latest]
         php-versions: ['7.2', '7.3', '7.4']
     runs-on: ${{ matrix.operating-system }}
     steps:
diff --git a/examples/laravel.yml b/examples/laravel.yml
index cf93fae0..d5b84465 100644
--- a/examples/laravel.yml
+++ b/examples/laravel.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macos-latest]
         php-versions: ['7.2', '7.3', '7.4']
     steps:
       - name: Checkout
diff --git a/examples/lumen.yml b/examples/lumen.yml
index 389c1ed4..0b7ae9bc 100644
--- a/examples/lumen.yml
+++ b/examples/lumen.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macos-latest]
         php-versions: ['7.2', '7.3', '7.4']
     steps:
       - name: Checkout
diff --git a/examples/slim-framework.yml b/examples/slim-framework.yml
index 2716dfdf..bea31160 100644
--- a/examples/slim-framework.yml
+++ b/examples/slim-framework.yml
@@ -5,7 +5,7 @@ jobs:
   build:
     strategy:
       matrix:
-        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macos-latest]
         php-versions: ['7.2', '7.3', '7.4']
     runs-on: ${{ matrix.operating-system }}
     steps:
diff --git a/examples/symfony.yml b/examples/symfony.yml
index 25d40fde..f171e9b6 100644
--- a/examples/symfony.yml
+++ b/examples/symfony.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macos-latest]
         php-versions: ['7.3', '7.4']
     steps:
       - name: Checkout
diff --git a/examples/zend-framework.yml b/examples/zend-framework.yml
index aad2f943..150ee631 100644
--- a/examples/zend-framework.yml
+++ b/examples/zend-framework.yml
@@ -5,7 +5,7 @@ jobs:
   build:
     strategy:
       matrix:
-        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
+        operating-system: [ubuntu-latest, windows-latest, macos-latest]
         php-versions: ['7.2', '7.3', '7.4']
     runs-on: ${{ matrix.operating-system }}
     steps: