diff --git a/spec/epp/keyrelay_spec.rb b/spec/epp/keyrelay_spec.rb
index 293c295bc..fb428a328 100644
--- a/spec/epp/keyrelay_spec.rb
+++ b/spec/epp/keyrelay_spec.rb
@@ -204,7 +204,7 @@ describe 'EPP Keyrelay', epp: true do
     }, {
       _anonymus: [
         legalDocument: {
-          value: 'dGVzdCBmYWlsCg==',
+          value: Base64.encode64('S' * 4.kilobytes),
           attrs: { type: 'jpg' }
         }
       ]
diff --git a/spec/support/epp.rb b/spec/support/epp.rb
index 7088f1542..65bf48523 100644
--- a/spec/support/epp.rb
+++ b/spec/support/epp.rb
@@ -235,7 +235,7 @@ module Epp
     epp_xml.create(xml_params, {}, {
       _anonymus: [
         legalDocument: {
-          value: 'dGVzdCBmYWlsCg==',
+          value: Base64.encode64('S' * 4.kilobytes),
           attrs: { type: 'pdf' }
         }
       ]
@@ -320,7 +320,7 @@ module Epp
     custom_params = {
       _anonymus: [
         legalDocument: {
-          value: 'dGVzdCBmYWlsCg==',
+          value: Base64.encode64('S' * 4.kilobytes),
           attrs: { type: 'pdf' }
         }
       ]