diff --git a/.travis.yml b/.travis.yml
index 10d366e..9e10589 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,6 @@ cache:
   - $HOME/.composer/cache/files
 
 php:
-- 7.0
 - 7.1
 - 7.2
 - 7.3
@@ -16,18 +15,16 @@ matrix:
 
 jobs:
   include:
-  - php: 7.0
+  - php: 7.1
     env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest"
   - php: 7.2
-    env: COVERAGE=true DEPENDENCIES="leanphp/phpspec-code-coverage"
+    env: COVERAGE=true DEPENDENCIES="leanphp/phpspec-code-coverage phpspec/phpspec:^4.2"
     script:
     - composer test-ci
     after_success:
     - wget https://scrutinizer-ci.com/ocular.phar
     - php ocular.phar code-coverage:upload --format=php-clover build/coverage.xml --revision=$TRAVIS_COMMIT
     # Test LTS versions
-  - php: 7.2
-    env: DEPENDENCIES="dunglas/symfony-lock:^2"
   - php: 7.2
     env: DEPENDENCIES="dunglas/symfony-lock:^3"
   - php: 7.2
diff --git a/composer.json b/composer.json
index 53f91e1..9d65c4a 100644
--- a/composer.json
+++ b/composer.json
@@ -11,18 +11,18 @@
         }
     ],
     "require": {
-        "php": "^7.0",
+        "php": "^7.1",
         "php-http/httplug": "^2.0",
         "php-http/message-factory": "^1.0",
         "php-http/message": "^1.6",
-        "symfony/options-resolver": "^2.6 || ^3.0 || ^4.0"
+        "symfony/options-resolver": " ^3.4.20 || ^4.0.15 || ^4.1.9 || ^4.2.1"
     },
     "require-dev": {
-        "doctrine/instantiator": ">=1.0.5",
+        "doctrine/instantiator": "^1.1",
         "guzzlehttp/psr7": "^1.4",
-        "phpspec/phpspec": "^3.4 || ^4.2",
-        "phpspec/prophecy": ">=1.8",
-        "sebastian/comparator": ">=2"
+        "phpspec/phpspec": "^5.1",
+        "phpspec/prophecy": "^1.8",
+        "sebastian/comparator": "^3.0"
     },
     "suggest": {
         "ext-json": "To detect JSON responses with the ContentTypePlugin",