diff --git a/src/NzbDrone.Core/Configuration/ConfigFileProvider.cs b/src/NzbDrone.Core/Configuration/ConfigFileProvider.cs
index 4776240fc..75d412b2e 100644
--- a/src/NzbDrone.Core/Configuration/ConfigFileProvider.cs
+++ b/src/NzbDrone.Core/Configuration/ConfigFileProvider.cs
@@ -211,9 +211,20 @@ public AuthenticationType AuthenticationMethod
                     return AuthenticationType.Forms;
                 }
 
-                return Enum.TryParse<AuthenticationType>(_authOptions.Method, out var enumValue)
+                var value = Enum.TryParse<AuthenticationType>(_authOptions.Method, out var enumValue)
                     ? enumValue
                     : GetValueEnum("AuthenticationMethod", AuthenticationType.None);
+
+#pragma warning disable CS0618 // Type or member is obsolete
+                if (value == AuthenticationType.Basic)
+#pragma warning restore CS0618 // Type or member is obsolete
+                {
+                    SetValue("AuthenticationMethod", AuthenticationType.Forms);
+
+                    return AuthenticationType.Forms;
+                }
+
+                return value;
             }
         }
 
@@ -389,6 +400,12 @@ public void MigrateConfigFile()
             {
                 SetValue("EnableSsl", false);
             }
+#pragma warning disable CS0618 // Type or member is obsolete
+            if (AuthenticationMethod == AuthenticationType.Basic)
+#pragma warning restore CS0618 // Type or member is obsolete
+            {
+                SetValue("AuthenticationMethod", AuthenticationType.Forms);
+            }
         }
 
         private void DeleteOldValues()