diff --git a/Gemfile b/Gemfile
index ca598b7..471d497 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,5 +17,5 @@ group :development, :test do
   gem 'rubocop-rake', '~> 0.6.0'
   gem 'simplecov', '~> 0.22.0'
   gem 'vcr', '5.0'
-  gem 'webmock', '~> 3.19'
+  gem 'webmock', '~> 3.21'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index b0847e4..c7e0ed3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -25,7 +25,8 @@ GEM
     coderay (1.1.3)
     concurrent-ruby (1.2.3)
     connection_pool (2.4.1)
-    crack (0.4.5)
+    crack (1.0.0)
+      bigdecimal
       rexml
     docile (1.4.0)
     drb (2.2.0)
@@ -87,7 +88,7 @@ GEM
       concurrent-ruby (~> 1.0)
     unicode-display_width (2.5.0)
     vcr (5.0.0)
-    webmock (3.19.1)
+    webmock (3.21.1)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
@@ -108,7 +109,7 @@ DEPENDENCIES
   rubocop-rake (~> 0.6.0)
   simplecov (~> 0.22.0)
   vcr (= 5.0)
-  webmock (~> 3.19)
+  webmock (~> 3.21)
 
 BUNDLED WITH
    2.4.9