diff --git a/Gemfile.lock b/Gemfile.lock
index 8150e5f..d7fccfc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,7 +3,7 @@ PATH
   specs:
     natra (1.9.0)
       activesupport (>= 5, < 7)
-      thor (~> 0.18)
+      thor (>= 0.18, < 2.0)
 
 GEM
   remote: https://rubygems.org/
@@ -140,7 +140,7 @@ GEM
     simplecov-html (0.10.2)
     term-ansicolor (1.7.1)
       tins (~> 1.0)
-    thor (0.20.3)
+    thor (1.1.0)
     thread_safe (0.3.6)
     tins (1.20.2)
     tzinfo (1.2.5)
diff --git a/natra.gemspec b/natra.gemspec
index 380c076..f397ff7 100644
--- a/natra.gemspec
+++ b/natra.gemspec
@@ -29,5 +29,5 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
   spec.add_development_dependency 'bundler', '~> 2.0'
   spec.add_runtime_dependency('activesupport', '>= 5', '< 7')
-  spec.add_runtime_dependency('thor', '~> 0.18')
+  spec.add_runtime_dependency('thor', '>= 0.18', '< 2.0')
 end