diff --git a/app/models/webauthn_credential.rb b/app/models/webauthn_credential.rb
index 4129ce539..7d423e38d 100644
--- a/app/models/webauthn_credential.rb
+++ b/app/models/webauthn_credential.rb
@@ -18,5 +18,5 @@ class WebauthnCredential < ApplicationRecord
   validates :external_id, uniqueness: true
   validates :nickname, uniqueness: { scope: :user_id }
   validates :sign_count,
-            numericality: { only_integer: true, greater_than_or_equal_to: 0, less_than_or_equal_to: 2**32 - 1 }
+            numericality: { only_integer: true, greater_than_or_equal_to: 0, less_than_or_equal_to: 2**63 - 1 }
 end
diff --git a/spec/models/webauthn_credentials_spec.rb b/spec/models/webauthn_credentials_spec.rb
index 9289c371e..a63ae6cd2 100644
--- a/spec/models/webauthn_credentials_spec.rb
+++ b/spec/models/webauthn_credentials_spec.rb
@@ -69,8 +69,8 @@ RSpec.describe WebauthnCredential, type: :model do
       expect(webauthn_credential).to model_have_error_on_field(:sign_count)
     end
 
-    it 'is invalid if sign_count is greater 2**32 - 1' do
-      webauthn_credential = Fabricate.build(:webauthn_credential, sign_count: 2**32)
+    it 'is invalid if sign_count is greater 2**63 - 1' do
+      webauthn_credential = Fabricate.build(:webauthn_credential, sign_count: 2**63)
 
       webauthn_credential.valid?