diff --git a/.travis.yml b/.travis.yml
index f2fcea9c1c..8bfcad08e9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,8 @@ addons:
   postgresql: "10"
 cache:
   bundler: true
+  directories:
+    - /home/travis/.webdrivers/
 rvm:
   - 2.5.5
   - 2.6.3
diff --git a/alchemy_cms.gemspec b/alchemy_cms.gemspec
index 86dd9ed9b1..3193b97ab1 100644
--- a/alchemy_cms.gemspec
+++ b/alchemy_cms.gemspec
@@ -37,7 +37,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency 'request_store',                    ['~> 1.2']
   gem.add_runtime_dependency 'responders',                       ['>= 2.0', '< 4.0']
   gem.add_runtime_dependency 'select2-rails',                    ['>= 3.5.9.1', '< 4.0']
-  gem.add_runtime_dependency 'simple_form',                      ['~> 4.0']
+  gem.add_runtime_dependency 'simple_form',                      ['>= 4.0', '< 6']
   gem.add_runtime_dependency 'turbolinks',                       ['>= 2.5']
 
   gem.add_development_dependency 'capybara',                     ['~> 3.0']