diff --git a/.travis.yml b/.travis.yml
index ff2fcc7e..da2c3d54 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,6 @@ install:
   - composer install --ignore-platform-reqs
 
 script:
-  - docker-compose -f docker-compose.yml pull
+  - docker-compose -f docker-compose.yml build
   - docker-compose -f docker-compose.yml run php /opt/project/phpstorm-stubs/vendor/bin/phpunit /opt/project/phpstorm-stubs/tests/
   - ./tests/check-stub-map
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 00000000..7c35e972
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,8 @@
+FROM php:7.3
+RUN set -x \
+    && apt-get update \
+    && apt-get install -y libldap2-dev \
+    && rm -rf /var/lib/apt/lists/* \
+    && docker-php-ext-configure ldap --with-libdir=lib/x86_64-linux-gnu/ \
+    && docker-php-ext-install ldap \
+    && apt-get purge -y --auto-remove libldap2-dev
\ No newline at end of file
diff --git a/docker-compose.yml b/docker-compose.yml
index d9a02106..bae13df3 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,6 +1,6 @@
 version: '2'
 services:
   php:
-    image: php:7.3
+    build: .
     volumes:
       - .:/opt/project/phpstorm-stubs