diff --git a/src/Radarr.Api.V3/Config/ConfigController.cs b/src/Radarr.Api.V3/Config/ConfigController.cs
index e9ab4cbfe..38aae64c9 100644
--- a/src/Radarr.Api.V3/Config/ConfigController.cs
+++ b/src/Radarr.Api.V3/Config/ConfigController.cs
@@ -10,7 +10,7 @@ namespace Radarr.Api.V3.Config
     public abstract class ConfigController<TResource> : RestController<TResource>
         where TResource : RestResource, new()
     {
-        private readonly IConfigService _configService;
+        protected readonly IConfigService _configService;
 
         protected ConfigController(IConfigService configService)
         {
@@ -23,6 +23,7 @@ protected override TResource GetResourceById(int id)
         }
 
         [HttpGet]
+        [Produces("application/json")]
         public TResource GetConfig()
         {
             var resource = ToResource(_configService);
@@ -32,7 +33,8 @@ public TResource GetConfig()
         }
 
         [RestPutById]
-        public ActionResult<TResource> SaveConfig(TResource resource)
+        [Consumes("application/json")]
+        public virtual ActionResult<TResource> SaveConfig(TResource resource)
         {
             var dictionary = resource.GetType()
                 .GetProperties(BindingFlags.Instance | BindingFlags.Public)
diff --git a/src/Radarr.Api.V3/Config/UiConfigController.cs b/src/Radarr.Api.V3/Config/UiConfigController.cs
index 9904c15ea..0b0da4d25 100644
--- a/src/Radarr.Api.V3/Config/UiConfigController.cs
+++ b/src/Radarr.Api.V3/Config/UiConfigController.cs
@@ -1,19 +1,40 @@
+using System.Linq;
+using System.Reflection;
+using Microsoft.AspNetCore.Mvc;
 using NzbDrone.Core.Configuration;
+using Radarr.Api.V3.Config;
 using Radarr.Http;
+using Radarr.Http.REST.Attributes;
 
 namespace Radarr.Api.V3.Config
 {
     [V3ApiController("config/ui")]
     public class UiConfigController : ConfigController<UiConfigResource>
     {
-        public UiConfigController(IConfigService configService)
+        private readonly IConfigFileProvider _configFileProvider;
+
+        public UiConfigController(IConfigFileProvider configFileProvider, IConfigService configService)
             : base(configService)
         {
+            _configFileProvider = configFileProvider;
+        }
+
+        [RestPutById]
+        public override ActionResult<UiConfigResource> SaveConfig(UiConfigResource resource)
+        {
+            var dictionary = resource.GetType()
+                                     .GetProperties(BindingFlags.Instance | BindingFlags.Public)
+                                     .ToDictionary(prop => prop.Name, prop => prop.GetValue(resource, null));
+
+            _configFileProvider.SaveConfigDictionary(dictionary);
+            _configService.SaveConfigDictionary(dictionary);
+
+            return Accepted(resource.Id);
         }
 
         protected override UiConfigResource ToResource(IConfigService model)
         {
-            return UiConfigResourceMapper.ToResource(model);
+            return UiConfigResourceMapper.ToResource(_configFileProvider, model);
         }
     }
 }
diff --git a/src/Radarr.Api.V3/Config/UiConfigResource.cs b/src/Radarr.Api.V3/Config/UiConfigResource.cs
index 3c012337c..6ef78626c 100644
--- a/src/Radarr.Api.V3/Config/UiConfigResource.cs
+++ b/src/Radarr.Api.V3/Config/UiConfigResource.cs
@@ -21,11 +21,12 @@ public class UiConfigResource : RestResource
         public bool EnableColorImpairedMode { get; set; }
         public int MovieInfoLanguage { get; set; }
         public int UILanguage { get; set; }
+        public string Theme { get; set; }
     }
 
     public static class UiConfigResourceMapper
     {
-        public static UiConfigResource ToResource(IConfigService model)
+        public static UiConfigResource ToResource(IConfigFileProvider config, IConfigService model)
         {
             return new UiConfigResource
             {
@@ -41,7 +42,8 @@ public static UiConfigResource ToResource(IConfigService model)
 
                 EnableColorImpairedMode = model.EnableColorImpairedMode,
                 MovieInfoLanguage = model.MovieInfoLanguage,
-                UILanguage = model.UILanguage
+                UILanguage = model.UILanguage,
+                Theme = config.Theme
             };
         }
     }