diff --git a/Gemfile.lock b/Gemfile.lock
index a057d26..d176e67 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,21 +2,22 @@ PATH
   remote: .
   specs:
     sepomex_acrogenesis (0.4.0)
-      activesupport (~> 5.2)
+      activesupport (>= 5.2, < 7.0)
       httparty (~> 0.16.0)
       json (~> 2.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.2.4.1)
+    activesupport (6.0.3.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
+      zeitwerk (~> 2.2, >= 2.2.2)
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.6)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     diff-lcs (1.3)
@@ -25,13 +26,13 @@ GEM
     httparty (0.16.4)
       mime-types (~> 3.0)
       multi_xml (>= 0.5.2)
-    i18n (1.7.0)
+    i18n (1.8.2)
       concurrent-ruby (~> 1.0)
     json (2.2.0)
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2019.1009)
-    minitest (5.13.0)
+    mime-types-data (3.2020.0512)
+    minitest (5.14.1)
     multi_xml (0.6.0)
     public_suffix (4.0.1)
     rspec (3.8.0)
@@ -54,12 +55,13 @@ GEM
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
     thread_safe (0.3.6)
-    tzinfo (1.2.6)
+    tzinfo (1.2.7)
       thread_safe (~> 0.1)
     webmock (3.7.2)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
+    zeitwerk (2.3.0)
 
 PLATFORMS
   ruby
diff --git a/sepomex_acrogenesis.gemspec b/sepomex_acrogenesis.gemspec
index 8815fd3..f142298 100644
--- a/sepomex_acrogenesis.gemspec
+++ b/sepomex_acrogenesis.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency 'httparty', "~> 0.16.0"
   spec.add_dependency "json", "~> 2.0"
-  spec.add_dependency 'activesupport', "~> 5.2"
+  spec.add_dependency 'activesupport', ">= 5.2", "< 7.0"
 
   spec.add_development_dependency "rspec", "~> 3.8"
   spec.add_development_dependency "webmock", "~> 3.7"