diff --git a/omniauth-smart.gemspec b/omniauth-smart.gemspec
index 89eb68f..b57a655 100644
--- a/omniauth-smart.gemspec
+++ b/omniauth-smart.gemspec
@@ -6,7 +6,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require "omniauth-smart/version"
 
 Gem::Specification.new do |gem|
-  gem.add_runtime_dependency "omniauth", "~> 1.0"
+  gem.add_runtime_dependency "omniauth", ">= 1", "< 3"
   gem.add_runtime_dependency "jwt", "~> 2.2.1"
   gem.add_runtime_dependency "faraday", ">= 0.8"
   gem.add_runtime_dependency "multi_json", "~> 1.3"