diff --git a/.travis.yml b/.travis.yml
index 84e529d..57a8784 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ sudo: required
 language: php
 
 php:
+  - 7.1
   - 7.2
   - 7.3
 
diff --git a/composer.json b/composer.json
index 85bae27..bf4fed8 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
         }
     ],
     "require": {
-        "php": "^7.2"
+        "php": "^7.1"
     },
     "require-dev": {
         "ext-gd": "*",