diff --git a/Gemfile b/Gemfile
index abc568a..cfa6c1b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source "https://rubygems.org"
 
 gemspec
 
-gem "sqlite3"
+gem "sqlite3", "~> 1.4"
 
 group :test do
   gem "activerecord"
diff --git a/devise-guests.gemspec b/devise-guests.gemspec
index bb83e2a..8ca5645 100644
--- a/devise-guests.gemspec
+++ b/devise-guests.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency "rspec", "~> 3.0"
   s.add_development_dependency "rake"
-  s.add_development_dependency "combustion", "~> 1.0"
+  s.add_development_dependency "combustion", "~> 1.3"
   s.add_development_dependency "rspec-rails"
   s.add_development_dependency "capybara"
   s.add_development_dependency "standard"