diff --git a/Gemfile.lock b/Gemfile.lock
index 3390063..03a3ca0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     country_select (8.0.3)
-      countries (~> 5.0)
+      countries (> 5.0, < 7.0)
 
 GEM
   remote: https://rubygems.org/
@@ -39,7 +39,7 @@ GEM
     coderay (1.1.3)
     concurrent-ruby (1.2.3)
     connection_pool (2.4.1)
-    countries (5.7.2)
+    countries (6.0.0)
       unaccent (~> 0.3)
     crass (1.0.6)
     diff-lcs (1.5.1)
diff --git a/country_select.gemspec b/country_select.gemspec
index e3adc04..ab91734 100644
--- a/country_select.gemspec
+++ b/country_select.gemspec
@@ -32,5 +32,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rspec', '~> 3'
   s.add_development_dependency 'simplecov', '~> 0.22'
 
-  s.add_dependency 'countries', '~> 5.0'
+  s.add_dependency 'countries', '> 5.0', '< 7.0'
 end
diff --git a/gemfiles/actionpack-6.1.gemfile.lock b/gemfiles/actionpack-6.1.gemfile.lock
index 43d0df6..a7209d9 100644
--- a/gemfiles/actionpack-6.1.gemfile.lock
+++ b/gemfiles/actionpack-6.1.gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: ..
   specs:
     country_select (8.0.3)
-      countries (~> 5.0)
+      countries (> 5.0, < 7.0)
 
 GEM
   remote: https://rubygems.org/
@@ -29,7 +29,7 @@ GEM
     builder (3.2.4)
     coderay (1.1.3)
     concurrent-ruby (1.2.3)
-    countries (5.7.2)
+    countries (6.0.0)
       unaccent (~> 0.3)
     crass (1.0.6)
     diff-lcs (1.5.1)
diff --git a/gemfiles/actionpack-7.0.gemfile.lock b/gemfiles/actionpack-7.0.gemfile.lock
index c175caa..31969eb 100644
--- a/gemfiles/actionpack-7.0.gemfile.lock
+++ b/gemfiles/actionpack-7.0.gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: ..
   specs:
     country_select (8.0.3)
-      countries (~> 5.0)
+      countries (> 5.0, < 7.0)
 
 GEM
   remote: https://rubygems.org/
@@ -28,7 +28,7 @@ GEM
     builder (3.2.4)
     coderay (1.1.3)
     concurrent-ruby (1.2.3)
-    countries (5.7.2)
+    countries (6.0.0)
       unaccent (~> 0.3)
     crass (1.0.6)
     diff-lcs (1.5.1)
diff --git a/gemfiles/actionpack-7.1.gemfile.lock b/gemfiles/actionpack-7.1.gemfile.lock
index 8fa4751..c83bdd9 100644
--- a/gemfiles/actionpack-7.1.gemfile.lock
+++ b/gemfiles/actionpack-7.1.gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: ..
   specs:
     country_select (8.0.3)
-      countries (~> 5.0)
+      countries (> 5.0, < 7.0)
 
 GEM
   remote: https://rubygems.org/
@@ -39,7 +39,7 @@ GEM
     coderay (1.1.3)
     concurrent-ruby (1.2.3)
     connection_pool (2.4.1)
-    countries (5.7.2)
+    countries (6.0.0)
       unaccent (~> 0.3)
     crass (1.0.6)
     diff-lcs (1.5.1)