diff --git a/lib/openapi_client/models/bank_account.rb b/lib/openapi_client/models/bank_account.rb
index 9554792..77d08ac 100755
--- a/lib/openapi_client/models/bank_account.rb
+++ b/lib/openapi_client/models/bank_account.rb
@@ -257,7 +257,7 @@ def list_invalid_properties
         invalid_properties.push("invalid value for \"id\", must conform to the pattern #{pattern}.")
       end
 
-      pattern = Regexp.new(/^https:\/\/lob-assets\.com\/(letters|postcards|bank-accounts|checks|self-mailers|cards)\/[a-z]{3,4}_[a-z0-9]{15,16}(\.pdf|_thumb_[a-z]+_[0-9]+\.png)\?(version=[a-z0-9-]*&)?expires=[0-9]{10}&signature=[a-zA-Z0-9-_]+$/)
+      pattern = Regexp.new(/^https:\/\/lob-assets.com\/(letters|postcards|bank-accounts|checks|self-mailers|cards)\/[a-z]{3,4}_[a-z0-9]{15,16}(''|_signature)(.pdf|_thumb_[a-z]+_[0-9]+.png|.png)\?(version=[a-z0-9]*&)expires=[0-9]{10}&signature=[a-zA-Z0-9-_]+/)
       if !@signature_url.nil? && @signature_url !~ pattern
         invalid_properties.push("invalid value for \"signature_url\", must conform to the pattern #{pattern}.")
       end
@@ -293,7 +293,7 @@ def valid?
       return false if @signatory.to_s.length > 30
       return false if @id.nil?
       return false if @id !~ Regexp.new(/^bank_[a-zA-Z0-9]+$/)
-      return false if !@signature_url.nil? && @signature_url !~ Regexp.new(/^https:\/\/lob-assets\.com\/(letters|postcards|bank-accounts|checks|self-mailers|cards)\/[a-z]{3,4}_[a-z0-9]{15,16}(\.pdf|_thumb_[a-z]+_[0-9]+\.png)\?(version=[a-z0-9-]*&)?expires=[0-9]{10}&signature=[a-zA-Z0-9-_]+$/)
+      return false if !@signature_url.nil? && @signature_url !~ Regexp.new(/^https:\/\/lob-assets.com\/(letters|postcards|bank-accounts|checks|self-mailers|cards)\/[a-z]{3,4}_[a-z0-9]{15,16}(''|_signature)(.pdf|_thumb_[a-z]+_[0-9]+.png|.png)\?(version=[a-z0-9]*&)expires=[0-9]{10}&signature=[a-zA-Z0-9-_]+/)
       return false if @date_created.nil?
       return false if @date_modified.nil?
       return false if @object.nil?
@@ -392,7 +392,7 @@ def id=(id)
     # Custom attribute writer method with validation
     # @param [Object] signature_url Value to be assigned
     def signature_url=(signature_url)
-      pattern = Regexp.new(/^https:\/\/lob-assets\.com\/(letters|postcards|bank-accounts|checks|self-mailers|cards)\/[a-z]{3,4}_[a-z0-9]{15,16}(\.pdf|_thumb_[a-z]+_[0-9]+\.png)\?(version=[a-z0-9-]*&)?expires=[0-9]{10}&signature=[a-zA-Z0-9-_]+$/)
+      pattern = Regexp.new(/^https:\/\/lob-assets.com\/(letters|postcards|bank-accounts|checks|self-mailers|cards)\/[a-z]{3,4}_[a-z0-9]{15,16}(''|_signature)(.pdf|_thumb_[a-z]+_[0-9]+.png|.png)\?(version=[a-z0-9]*&)expires=[0-9]{10}&signature=[a-zA-Z0-9-_]+/)
       if !signature_url.nil? && signature_url !~ pattern
         fail ArgumentError, "invalid value for \"signature_url\", must conform to the pattern #{pattern}."
       end
diff --git a/lib/openapi_client/version.rb b/lib/openapi_client/version.rb
index ed23215..e2bce6a 100755
--- a/lib/openapi_client/version.rb
+++ b/lib/openapi_client/version.rb
@@ -11,5 +11,5 @@
 =end
 
 module Lob
-  VERSION = '6.0.3'
+  VERSION = '6.0.4'
 end