diff --git a/Gemfile.lock b/Gemfile.lock
index 64d231b..b3ddaaa 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,15 +5,13 @@ GEM
       public_suffix (>= 2.0.2, < 4.0)
     coderay (1.1.2)
     colorator (1.1.0)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.3.7)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
-    eventmachine (1.2.7-x64-mingw32)
     eventmachine (1.2.7-x86-mingw32)
     ffi (1.11.1)
-    ffi (1.11.1-x64-mingw32)
     ffi (1.11.1-x86-mingw32)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
@@ -78,7 +76,7 @@ GEM
 
 PLATFORMS
   ruby
-  x64-mingw32
+  x64-mingw-ucrt
   x86-mingw32
 
 DEPENDENCIES