diff --git a/.travis.yml b/.travis.yml
index 1f5c1fd..85fc0ff 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,7 @@ php:
   - 7.1
   - 7.2
   - 7.3
+  - 7.4
 
 before_install:
   - nvm install 8
@@ -25,4 +26,4 @@ script:
   - scripts/test.sh
 
 after_success:
-    - bash <(curl -s https://codecov.io/bash) -t 8436848f-9a99-4b49-be60-629d7ff9a62c
\ No newline at end of file
+    - bash <(curl -s https://codecov.io/bash) -t 8436848f-9a99-4b49-be60-629d7ff9a62c
diff --git a/docker/php/Dockerfile-74 b/docker/php/Dockerfile-74
new file mode 100644
index 0000000..f957a25
--- /dev/null
+++ b/docker/php/Dockerfile-74
@@ -0,0 +1,23 @@
+FROM php:7.4-alpine
+
+MAINTAINER Peter Lai <alk03073135@gmail.com>
+
+COPY composer-setup.php composer-setup.php
+# COPY php.ini-production $PHP_INI_DIR/php.ini
+
+RUN apk update && \
+    apk add git
+
+# Install gmp
+Run apk add gmp-dev && \
+    docker-php-ext-install gmp
+
+# Install nodejs
+# Run apk add --update nodejs nodejs-npm
+
+# Install composer
+RUN php composer-setup.php && \
+    php composer-setup.php --install-dir=/usr/bin --filename=composer && \
+    php -r "unlink('composer-setup.php');"
+
+WORKDIR /app