diff --git a/nuget/lib/dependabot/nuget/nuget_client.rb b/nuget/lib/dependabot/nuget/nuget_client.rb
index 1b96651d0e3..d0d6289f1fc 100644
--- a/nuget/lib/dependabot/nuget/nuget_client.rb
+++ b/nuget/lib/dependabot/nuget/nuget_client.rb
@@ -133,6 +133,7 @@ def self.get_package_versions(dependency_name, repository_details)
             &.find { |d| d.fetch("id").casecmp(dependency_name.downcase).zero? }
             &.fetch("versions")
             &.map { |d| d.fetch("version") }
+            &.to_set
       end
 
       sig do