diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 88d6d37f..5c1c77c3 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -8,7 +8,7 @@ jobs:
       max-parallel: 6
       matrix:
         operating-system: [ubuntu-latest, windows-latest, macOS-latest]
-        php-versions: ['5.6', '7.0', '7.1', '7.2', '7.3']
+        php-versions: ['5.6', '7.0', '7.1', '7.2', '7.3', '7.4']
     steps:
     - name: Checkout
       uses: actions/checkout@master
@@ -27,4 +27,4 @@ jobs:
         php-version: ${{ matrix.php-versions }}
         extension-csv: "mbstring, curl, mysqli, json, xml, xdebug, pcov, phpdbg"
     - name: Testing
-      run: php -m
+      run: php -v && composer -V && php -m
diff --git a/README.md b/README.md
index bc11213f..f29b0119 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,9 @@
 - 7.1
 - 7.2
 - 7.3
+- 7.4 `7.4.0beta4` on `ubuntu`, and `7.4.0RC1` on `windows` and `macOS`
+
+**Note:** PHP 7.4 is currently in development, do not use in production.
 
 ## OS Support
 
@@ -97,6 +100,7 @@ Contributions are welcome!  See [Contributor's Guide](docs/contributors.md)
 - [Homebrew](https://brew.sh/)
 - [ppa:ondrej/php](https://launchpad.net/~ondrej/+archive/ubuntu/php)
 - [exolnet/homebrew-deprecated](https://github.com/eXolnet/homebrew-deprecated)
+- [phpbrew](https://github.com/phpbrew/phpbrew)
 
 ## Further Reading
 
diff --git a/lib/install.js b/lib/install.js
index 83e03cbb..654245c8 100644
--- a/lib/install.js
+++ b/lib/install.js
@@ -104,9 +104,15 @@ function addExtension(extension_csv, version) {
                     });
                     const response = yield http.get('https://pecl.php.net/package/' + extension);
                     if (response.message.statusCode == 200) {
+                        let extension_version = 'stable';
+                        if (version == '7.4') {
+                            extension_version = 'alpha';
+                        }
                         windows +=
                             'try { Install-PhpExtension ' +
                                 extension +
+                                ' -MinimumStability ' +
+                                extension_version +
                                 ' } catch [Exception] { echo $_; echo "Could not install extension: "' +
                                 extension +
                                 ' }\n';
@@ -161,6 +167,9 @@ function run() {
                 version = core.getInput('php-version', { required: true });
             }
             console.log('Input: ' + version);
+            if (version == '7.4') {
+                darwin = fs.readFileSync(path.join(__dirname, '../src/7.4.sh'), 'utf8');
+            }
             let extension_csv = process.env['extension-csv'];
             if (!extension_csv) {
                 extension_csv = core.getInput('extension-csv');
diff --git a/package-lock.json b/package-lock.json
index 4408f379..9d5b8202 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "setup-php",
-  "version": "1.1.2",
+  "version": "1.2.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 0241a849..21f9ba86 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "setup-php",
-  "version": "1.1.2",
+  "version": "1.2.0",
   "private": false,
   "description": "Setup php action",
   "main": "lib/setup-php.js",
diff --git a/src/7.4.sh b/src/7.4.sh
new file mode 100644
index 00000000..3ccdda20
--- /dev/null
+++ b/src/7.4.sh
@@ -0,0 +1,48 @@
+brew fetch autoconf& brew fetch automake& brew fetch pcre& brew fetch libtool& brew fetch libpng& brew fetch webp& brew fetch jpeg& brew fetch freetype& brew fetch libxml2& brew fetch pkg-config& brew fetch krb5& brew fetch icu4c& brew fetch re2c& brew fetch bison& brew fetch libzip& brew fetch mcrypt& brew fetch zlib& brew fetch bzip2& brew fetch enchant
+brew install autoconf automake pcre libtool libpng webp jpeg freetype libxml2 pkg-config krb5 icu4c re2c bison libzip mcrypt zlib bzip2 enchant >> /dev/null
+brew link --force gettext
+brew link --force bison
+brew link --force openssl
+brew link --force libxml2
+brew link --force bzip2
+echo 'export PATH="/usr/local/opt/bzip2/bin:$PATH"' >> ~/.bash_profile
+echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile
+echo 'export PATH="/usr/local/opt/krb5/bin:$PATH"' >> ~/.bash_profile
+echo 'export PATH="/usr/local/opt/krb5/sbin:$PATH"' >> ~/.bash_profile
+echo 'export PATH="/usr/local/opt/icu4c/bin:$PATH"' >> ~/.bash_profile
+echo 'export PATH="/usr/local/opt/icu4c/sbin:$PATH"' >> ~/.bash_profile
+echo 'export PATH="/usr/local/opt/bzip2/bin:$PATH"' >> ~/.bash_profile
+echo 'export PATH="/usr/local/opt/bison/bin:$PATH"' >> ~/.bash_profile
+echo 'export PATH="/usr/local/opt/libxml2/bin:$PATH"' >> ~/.bash_profile
+echo 'export PATH="/Users/runner/.phpbrew/php/php-7.4.0RC1/bin:$PATH"' >> ~/.bash_profile
+source ~/.bash_profile >> /dev/null
+export LIBXML_LIBS="-L/usr/local/opt/libxml2/lib"
+export LIBXML_CFLAGS="-I/usr/local/opt/libxml2/include"
+export ENCHANT_LIBS="-L/usr/local/opt/enchant/lib"
+export ENCHANT_CFLAGS="-I/usr/local/opt/enchant/include"
+export FFI_LIBS="-L/usr/local/opt/libffi/lib"
+export FFI_CFLAGS="-I/usr/local/opt/libffi/include"
+export ICU_LIBS="-L/usr/local/opt/icu4c/lib"
+export ICU_CFLAGS="-I/usr/local/opt/icu4c/include"
+export KERBEROS_LIBS="-L/usr/local/opt/krb5/lib"
+export KERBEROS_CFLAGS="-I/usr/local/opt/krb5/include"
+export OPENSSL_LIBS="-L/usr/local/opt/openssl/lib"
+export OPENSSL_CFLAGS="-I/usr/local/opt/openssl/include"
+export READLINE_LIBS="-L/usr/local/opt/readline/lib"
+export READLINE_CFLAGS="-I/usr/local/opt/readline/include"
+export BZIP2_LIBS="-L/usr/local/opt/bzip2/lib"
+export BZIP2_CFLAGS="-I/usr/local/opt/bzip2/include"
+export PKG_CONFIG_PATH="/usr/local/opt/krb5/lib/pkgconfig:/usr/local/opt/icu4c/lib/pkgconfig:/usr/local/obzip2pt/libffi/lib/pkgconfig:/usr/local/opt/openssl@1.1/lib/pkgconfig:/usr/local/opt/readline/lib/pkgconfig:/usr/local/opt/libxml2/lib/pkgconfig:/usr/local/opt/krb5/lib/pkgconfig:/usr/local/opt/icu4c/lib/pkgconfig:/usr/local/opt/libffi/lib/pkgconfig:/usr/local/opt/libxml2/lib/pkgconfig"
+cd ~
+curl -L -O https://github.com/phpbrew/phpbrew/raw/master/phpbrew
+chmod +x ./phpbrew
+sudo mv phpbrew /usr/local/bin/phpbrew
+sudo mkdir -p /opt/phpbrew
+phpbrew init --root=/opt/phpbrew
+echo "[[ -e ~/.phpbrew/bashrc ]] && source ~/.phpbrew/bashrc" >> ~/.bashrc
+source ~/.bashrc
+phpbrew install -j 10 7.4.0RC1 +default +bz2="$(brew --prefix bzip2)" +zlib="$(brew --prefix zlib)" -openssl --  --with-libxml
+phpbrew switch php-7.4.0RC1 >> /dev/null
+sudo mkdir -p /usr/local/bin
+sudo ln -sf /Users/runner/.phpbrew/php/php-7.4.0RC1/bin/php /usr/local/bin/php
+brew install composer
\ No newline at end of file
diff --git a/src/darwin.sh b/src/darwin.sh
index ba26b6f1..98c96369 100644
--- a/src/darwin.sh
+++ b/src/darwin.sh
@@ -1,8 +1,6 @@
 echo $1
-ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
 brew unlink php
 brew tap exolnet/homebrew-deprecated
-brew tap homebrew/homebrew-php
 brew install php@$1
 brew link --force --overwrite php@$1
 curl -sS https://getcomposer.org/installer | php
diff --git a/src/install.ts b/src/install.ts
index f7f4db5d..71aaea19 100644
--- a/src/install.ts
+++ b/src/install.ts
@@ -90,9 +90,15 @@ async function addExtension(extension_csv: string, version: string) {
         'https://pecl.php.net/package/' + extension
       );
       if (response.message.statusCode == 200) {
+        let extension_version = 'stable';
+        if (version == '7.4') {
+          extension_version = 'alpha';
+        }
         windows +=
           'try { Install-PhpExtension ' +
           extension +
+          ' -MinimumStability ' +
+          extension_version +
           ' } catch [Exception] { echo $_; echo "Could not install extension: "' +
           extension +
           ' }\n';
@@ -142,6 +148,10 @@ async function run() {
     }
     console.log('Input: ' + version);
 
+    if (version == '7.4') {
+      darwin = fs.readFileSync(path.join(__dirname, '../src/7.4.sh'), 'utf8');
+    }
+
     let extension_csv = process.env['extension-csv'];
     if (!extension_csv) {
       extension_csv = core.getInput('extension-csv');
diff --git a/src/windows.ps1 b/src/windows.ps1
index a9dfa5bc..b093b70c 100644
--- a/src/windows.ps1
+++ b/src/windows.ps1
@@ -2,6 +2,10 @@ param (
     [Parameter(Mandatory=$true)][string]$version = "7.3"  
 )
 
+if($version -eq '7.4') {
+	$version = '7.4RC1'
+}
+
 echo "Installing NuGet"
 Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force
 if($version -lt '7.0') {
@@ -16,17 +20,20 @@ echo "Installing PhpManager"
 Install-Module -Name PhpManager -Force -Scope CurrentUser
 echo "Installing PHP"
 Uninstall-Php C:\tools\php
-Install-Php -Version $version -Architecture x86 -ThreadSafe $true -Path C:\tools\php$version -TimeZone UTC
+Install-Php -Version $version -Architecture x86 -ThreadSafe $true -Path C:\tools\php$version -TimeZone UTC -InitialPhpIni Production
 echo "Switch PHP"
 (Get-PhpSwitcher).targets
 Initialize-PhpSwitcher -Alias C:\tools\php -Scope CurrentUser -Force
 Add-PhpToSwitcher -Name $version -Path C:\tools\php$version -Force
 Switch-Php $version -Force
 echo "Housekeeping in PHP.ini, enabling openssl"
-Move-item -Path C:\tools\php$version\php.ini-production -Destination C:\tools\php$version\php.ini -Force
 Add-Content C:\tools\php$version\php.ini "date.timezone = 'UTC'"
 Set-PhpIniKey extension_dir C:\tools\php$version\ext
-Enable-PhpExtension openssl
+if($version -lt '7.4') {
+	Enable-PhpExtension openssl
+} else {
+	Add-Content C:\tools\php$version\php.ini "extension=php_openssl.dll"
+}
 echo "Installing Composer"
 Install-Composer -Scope System -Path C:\tools\php
 php -v