diff --git a/Gemfile.lock b/Gemfile.lock
index fe7521e..771d92c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     peatio-ndc (0.1.3)
-      activesupport (~> 5.2.3)
+      activesupport (>= 5.2.3, < 6.1.0)
       better-faraday (~> 1.0.5)
       faraday (~> 0.15.4)
       memoist (~> 0.16.0)
@@ -11,9 +11,9 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (5.2.4.2)
-      activesupport (= 5.2.4.2)
-    activesupport (5.2.4.2)
+    activemodel (5.2.4.3)
+      activesupport (= 5.2.4.3)
+    activesupport (5.2.4.3)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -128,7 +128,7 @@ GEM
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
-    websocket-driver (0.7.1)
+    websocket-driver (0.7.2)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.4)
 
diff --git a/peatio-ndc.gemspec b/peatio-ndc.gemspec
index bd34362..ef0597d 100644
--- a/peatio-ndc.gemspec
+++ b/peatio-ndc.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "activesupport", "~> 5.2.3"
+  spec.add_dependency "activesupport", ">= 5.2.3", "< 6.1.0"
   spec.add_dependency "better-faraday", "~> 1.0.5"
   spec.add_dependency "faraday", "~> 0.15.4"
   spec.add_dependency "memoist", "~> 0.16.0"