diff --git a/Lombiq.HelpfulLibraries.OrchardCore/Security/ReCaptchaContentSecurityPolicyProvider.cs b/Lombiq.HelpfulLibraries.OrchardCore/Security/ReCaptchaContentSecurityPolicyProvider.cs
index 9d763df2..da26947d 100644
--- a/Lombiq.HelpfulLibraries.OrchardCore/Security/ReCaptchaContentSecurityPolicyProvider.cs
+++ b/Lombiq.HelpfulLibraries.OrchardCore/Security/ReCaptchaContentSecurityPolicyProvider.cs
@@ -10,7 +10,7 @@
 
 namespace Lombiq.HelpfulLibraries.OrchardCore.Security;
 
-internal class ReCaptchaContentSecurityPolicyProvider : IContentSecurityPolicyProvider
+internal sealed class ReCaptchaContentSecurityPolicyProvider : IContentSecurityPolicyProvider
 {
     public async ValueTask UpdateAsync(IDictionary<string, string> securityPolicies, HttpContext context)
     {