diff --git a/Gemfile b/Gemfile
index 657606f..bb08013 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,4 +7,5 @@ gemspec
 
 group :development, :test do
   gem 'coveralls', require: false
+  gem 'pry'
 end
diff --git a/lib/mifiel/certificate.rb b/lib/mifiel/certificate.rb
index acb1347..28e00ab 100644
--- a/lib/mifiel/certificate.rb
+++ b/lib/mifiel/certificate.rb
@@ -16,7 +16,7 @@ def self.create(cer_file)
         },
         ssl_version: 'SSLv23'
       )
-      req = ApiAuth.sign!(rest_request, Mifiel.config.app_id, Mifiel.config.app_secret)
+      req = ApiAuth.sign!(rest_request, Mifiel.config.app_id, Mifiel.config.app_secret, { override_http_method: :post })
       Mifiel::Certificate.new(JSON.parse(req.execute))
     end
   end
diff --git a/lib/mifiel/document.rb b/lib/mifiel/document.rb
index 8dd2108..cb2beb1 100644
--- a/lib/mifiel/document.rb
+++ b/lib/mifiel/document.rb
@@ -74,7 +74,7 @@ def self.process_request(path, method, payload = nil)
         payload: payload,
         ssl_version: 'SSLv23'
       )
-      req = ApiAuth.sign!(rest_request, Mifiel.config.app_id, Mifiel.config.app_secret)
+      req = ApiAuth.sign!(rest_request, Mifiel.config.app_id, Mifiel.config.app_secret, { override_http_method: method })
       req.execute
     end
 
diff --git a/lib/mifiel/user.rb b/lib/mifiel/user.rb
index 57a2379..562538c 100644
--- a/lib/mifiel/user.rb
+++ b/lib/mifiel/user.rb
@@ -22,7 +22,7 @@ def self.setup_widget(args) # rubocop:disable Metrics/MethodLength, Metrics/AbcS
         },
         ssl_version: 'SSLv23'
       )
-      req = ApiAuth.sign!(rest_request, Mifiel.config.app_id, Mifiel.config.app_secret)
+      req = ApiAuth.sign!(rest_request, Mifiel.config.app_id, Mifiel.config.app_secret, { override_http_method: :post })
       Mifiel::User.new(JSON.parse(req.execute))
     end
   end
diff --git a/mifiel.gemspec b/mifiel.gemspec
index 8495d32..01b0b11 100644
--- a/mifiel.gemspec
+++ b/mifiel.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = '>= 2.3'
 
   spec.add_runtime_dependency 'activesupport'
-  spec.add_runtime_dependency 'api-auth', '~> 1.4'
+  spec.add_runtime_dependency 'api-auth', '>= 2.5'
   spec.add_runtime_dependency 'flexirest', '~> 1.6'
   spec.add_runtime_dependency 'json', '>= 1.8'
   spec.add_runtime_dependency 'rest-client', '>= 1.8'