diff --git a/Gemfile.lock b/Gemfile.lock
index 8546622..ba96c2e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,8 +1,8 @@
 PATH
   remote: .
   specs:
-    peatio (0.6.1)
-      activemodel (> 5.2.3, <= 6.0.0)
+    peatio (0.6.3)
+      activemodel (> 5.2, <= 6.0.0)
       amqp
       bunny
       clamp
@@ -54,7 +54,7 @@ GEM
     json (2.1.0)
     jwt (2.2.1)
     method_source (0.9.2)
-    minitest (5.12.2)
+    minitest (5.13.0)
     mysql2 (0.5.2)
     parallel (1.12.1)
     parser (2.5.1.2)
@@ -107,7 +107,7 @@ GEM
       thread_safe (~> 0.1)
     unicode-display_width (1.4.0)
     websocket (1.2.8)
-    zeitwerk (2.2.0)
+    zeitwerk (2.2.1)
 
 PLATFORMS
   ruby
diff --git a/lib/peatio/ranger.rb b/lib/peatio/ranger.rb
index be6e5ee..68855ef 100644
--- a/lib/peatio/ranger.rb
+++ b/lib/peatio/ranger.rb
@@ -70,7 +70,7 @@ def handshake(hs)
       @logger.info "ranger: WebSocket connection openned"
 
       if hs.headers_downcased.key?("authorization")
-        authorized, payload = authenticate(hs.headers["authorization"])
+        authorized, payload = authenticate(hs.headers_downcased["authorization"])
 
         if !authorized
           @logger.info "ranger: #{@client.user} authentication failed"
diff --git a/lib/peatio/version.rb b/lib/peatio/version.rb
index 6679f19..6f27178 100644
--- a/lib/peatio/version.rb
+++ b/lib/peatio/version.rb
@@ -1,3 +1,3 @@
 module Peatio
-  VERSION = "0.6.2"
+  VERSION = "0.6.3"
 end
diff --git a/peatio.gemspec b/peatio.gemspec
index 1ee18b5..19cc656 100644
--- a/peatio.gemspec
+++ b/peatio.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
   spec.executables = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "activemodel", "> 5.2.3", "<= 6.0.0"
+  spec.add_dependency "activemodel", "> 5.2", "<= 6.0.0"
   spec.add_dependency "clamp"
   spec.add_dependency "amqp"
   spec.add_dependency "eventmachine"