diff --git a/.travis.yml b/.travis.yml
index 94c6a58..e47a9a2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ language: php
 php:
   - 7.2
   - 7.3
+  - 7.4
 
 before_script:
   - composer global require --no-interaction --prefer-dist --update-no-dev hirak/prestissimo
diff --git a/README.md b/README.md
index b4af27a..af039bb 100644
--- a/README.md
+++ b/README.md
@@ -14,10 +14,18 @@ operations.
 
 ## Contents
 
+* [Compatibility](#compatibility)
 * [Installation](#installation) 
 * [Index Management](#index-management)
 * [Document Management](#document-management)
 
+## Compatibility
+
+The current version of Elastic Adapter has been tested with the following configuration:
+
+* PHP 7.2-7.4
+* Elasticsearch 7.x
+
 ## Installation
 
 The library can be installed via Composer:
diff --git a/composer.json b/composer.json
index da74b9f..c7ed54b 100644
--- a/composer.json
+++ b/composer.json
@@ -27,6 +27,7 @@
         }
     },
     "require": {
+        "php": "^7.2",
         "elasticsearch/elasticsearch": "^7.3"
     },
     "require-dev": {