diff --git a/app/lib/utils.rb b/app/lib/utils.rb
index bb14b9933..8da041f10 100644
--- a/app/lib/utils.rb
+++ b/app/lib/utils.rb
@@ -3,7 +3,7 @@ module Utils
 
   UUID_PATTERN = %r{\A[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}\z}
   EXTENSIONS_ALLOW_LIST = %w(pdf xml asice asics xzep zip txt doc docx jpg jpeg png tif tiff)
-  MIMETYPES_ALLOW_LIST = %w(application/x-eform-xml application/xml application/msword application/pdf application/vnd.etsi.asic-e+zip application/vnd.etsi.asic-s+zip application/vnd.openxmlformats-officedocument.wordprocessingml.document application/x-xades_zep application/x-zip-compressed image/jpg image/jpeg image/png image/tiff)
+  MIMETYPES_ALLOW_LIST = %w(application/x-eform-xml application/xml application/msword application/pdf application/vnd.etsi.asic-e+zip application/vnd.etsi.asic-s+zip application/vnd.openxmlformats-officedocument.wordprocessingml.document application/x-xades_zep application/x-zip-compressed image/jpg image/jpeg image/png image/tiff application/pkix-cert)
 
   def file_directory(file_path)
     File.dirname(file_path)
diff --git a/test/integration/upvs_message_drafts_api_test.rb b/test/integration/upvs_message_drafts_api_test.rb
index 483df0422..66d696cc2 100644
--- a/test/integration/upvs_message_drafts_api_test.rb
+++ b/test/integration/upvs_message_drafts_api_test.rb
@@ -1110,7 +1110,7 @@ class UpvsMessageDraftsApiTest < ActionDispatch::IntegrationTest
     assert_response :unprocessable_entity
 
     json_response = JSON.parse(response.body)
-    assert_equal 'Objects is not valid, MimeType of Attachment.txt object is disallowed, allowed mimetypes: application/x-eform-xml, application/xml, application/msword, application/pdf, application/vnd.etsi.asic-e+zip, application/vnd.etsi.asic-s+zip, application/vnd.openxmlformats-officedocument.wordprocessingml.document, application/x-xades_zep, application/x-zip-compressed, image/jpg, image/jpeg, image/png, image/tiff', json_response['message']
+    assert_equal 'Objects is not valid, MimeType of Attachment.txt object is disallowed, allowed mimetypes: application/x-eform-xml, application/xml, application/msword, application/pdf, application/vnd.etsi.asic-e+zip, application/vnd.etsi.asic-s+zip, application/vnd.openxmlformats-officedocument.wordprocessingml.document, application/x-xades_zep, application/x-zip-compressed, image/jpg, image/jpeg, image/png, image/tiff, application/pkix-cert', json_response['message']
 
     assert_equal Message.count, @before_request_messages_count
   end