diff --git a/barkbox_client.gemspec b/barkbox_client.gemspec
index d6aec8f..aaf0e09 100644
--- a/barkbox_client.gemspec
+++ b/barkbox_client.gemspec
@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "rails", ">= 4.2.5.2"
 
   spec.add_development_dependency "sqlite3"
-  spec.add_development_dependency "bundler", "~> 1.11"
+  spec.add_development_dependency "bundler", "~> 2.4.10"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec", "~> 3.5"
   spec.add_development_dependency "rspec-rails", "~> 3.5"
@@ -36,5 +36,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "webmock"
 
   spec.add_runtime_dependency "multi_json"
-  spec.add_runtime_dependency "oauth2", "~> 1.4.0"
+  spec.add_runtime_dependency "oauth2", "~> 2.0"
 end
diff --git a/lib/barkbox_client/api_error.rb b/lib/barkbox_client/api_error.rb
index 3fe7fa4..6224e9c 100644
--- a/lib/barkbox_client/api_error.rb
+++ b/lib/barkbox_client/api_error.rb
@@ -7,13 +7,21 @@ def initialize(response)
       @errors = JSON.parse(response.body, symbolize_names: true)[:errors]
       @errors = {general: errors} if errors.is_a?(String)
     rescue => e
-      @errors = {general: 'Error'}
+      @errors = {general: e.message}
     end
   end
 
   def pretty_errors
-    return @errors if @errors.is_a?(String)
-    @errors.map { |k, v| "#{k} #{v}" }.join(", ")
+    case @errors
+    when String
+      @errors
+    when Hash
+      @errors.map { |k, v| "#{k} #{v}" }.join(", ")
+    when NilClass
+      "@errors was nil"
+    else
+      "Unknown error format: #{@errors}"
+    end
   end
 
   def message