diff --git a/Src/Notion.Client/Models/Blocks/Color.cs b/Src/Notion.Client/Models/Blocks/Color.cs
index 46e38e2..ec6cc28 100644
--- a/Src/Notion.Client/Models/Blocks/Color.cs
+++ b/Src/Notion.Client/Models/Blocks/Color.cs
@@ -39,6 +39,9 @@ public enum Color
         [EnumMember(Value = "gray_background")]
         GrayBackground,
 
+        [EnumMember(Value = "default_background")]
+        DefaultBackground,
+
         [EnumMember(Value = "brown_background")]
         BrownBackground,
 
diff --git a/Src/Notion.Client/Models/CustomEmojiObject.cs b/Src/Notion.Client/Models/CustomEmojiObject.cs
new file mode 100644
index 0000000..f682b65
--- /dev/null
+++ b/Src/Notion.Client/Models/CustomEmojiObject.cs
@@ -0,0 +1,25 @@
+using Newtonsoft.Json;
+
+namespace Notion.Client
+{
+    public class CustomEmojiObject : IPageIcon
+    {
+        [JsonProperty("type")]
+        public virtual string Type { get; set; }
+        
+        [JsonProperty("custom_emoji")]
+        public Info Emoji { get; set; }
+
+        public class Info
+        {
+            [JsonProperty("id")]
+            public string Id { get; set; }
+
+            [JsonProperty("name")]
+            public string Name { get; set; }
+
+            [JsonProperty("url")]
+            public string Url { get; set; }
+        }
+    }
+}
diff --git a/Src/Notion.Client/Models/Page/IPageIcon.cs b/Src/Notion.Client/Models/Page/IPageIcon.cs
index b9ebea5..44f8385 100644
--- a/Src/Notion.Client/Models/Page/IPageIcon.cs
+++ b/Src/Notion.Client/Models/Page/IPageIcon.cs
@@ -7,6 +7,7 @@ namespace Notion.Client
     [JsonSubtypes.KnownSubTypeAttribute(typeof(EmojiObject), "emoji")]
     [JsonSubtypes.KnownSubTypeAttribute(typeof(FileObject), "file")]
     [JsonSubtypes.KnownSubTypeAttribute(typeof(FileObject), "external")]
+    [JsonSubtypes.KnownSubTypeAttribute(typeof(CustomEmojiObject), "custom_emoji")]    
     public interface IPageIcon
     {
         [JsonProperty("type")]
diff --git a/Src/Notion.Client/Notion.Client.csproj b/Src/Notion.Client/Notion.Client.csproj
index c7e96e0..95626f9 100644
--- a/Src/Notion.Client/Notion.Client.csproj
+++ b/Src/Notion.Client/Notion.Client.csproj
@@ -16,13 +16,13 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All">
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="all">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
-    <PackageReference Include="JsonSubTypes" Version="1.8.0" />
-	  <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="5.0.0" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="5.0.0" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="JsonSubTypes" Version="2.0.1" />
+	  <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.1" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/Src/Notion.Client/RestClient/RestClient.cs b/Src/Notion.Client/RestClient/RestClient.cs
index 59a848f..1874dd7 100644
--- a/Src/Notion.Client/RestClient/RestClient.cs
+++ b/Src/Notion.Client/RestClient/RestClient.cs
@@ -22,8 +22,6 @@ public class RestClient : IRestClient
             ContractResolver = new DefaultContractResolver { NamingStrategy = new CamelCaseNamingStrategy() }
         };
 
-        private HttpClient _httpClient;
-
         public RestClient(ClientOptions options)
         {
             _options = MergeOptions(options);
@@ -36,7 +34,7 @@ public async Task<T> GetAsync<T>(
             JsonSerializerSettings serializerSettings = null,
             CancellationToken cancellationToken = default)
         {
-            var response = await SendAsync(uri, HttpMethod.Get, queryParams, headers,
+            using var response = await SendAsync(uri, HttpMethod.Get, queryParams, headers,
                 cancellationToken: cancellationToken);
 
             return await response.ParseStreamAsync<T>(serializerSettings);
@@ -56,7 +54,7 @@ void AttachContent(HttpRequestMessage httpRequest)
                     Encoding.UTF8, "application/json");
             }
 
-            var response = await SendAsync(uri, HttpMethod.Post, queryParams, headers, AttachContent,
+            using var response = await SendAsync(uri, HttpMethod.Post, queryParams, headers, AttachContent,
                 cancellationToken);
 
             return await response.ParseStreamAsync<T>(serializerSettings);
@@ -76,7 +74,7 @@ void AttachContent(HttpRequestMessage httpRequest)
                 httpRequest.Content = new StringContent(serializedBody, Encoding.UTF8, "application/json");
             }
 
-            var response = await SendAsync(uri, new HttpMethod("PATCH"), queryParams, headers, AttachContent,
+            using var response = await SendAsync(uri, new HttpMethod("PATCH"), queryParams, headers, AttachContent,
                 cancellationToken);
 
             return await response.ParseStreamAsync<T>(serializerSettings);
@@ -88,7 +86,7 @@ public async Task DeleteAsync(
             IDictionary<string, string> headers = null,
             CancellationToken cancellationToken = default)
         {
-            await SendAsync(uri, HttpMethod.Delete, queryParams, headers, null, cancellationToken);
+            using var _ = await SendAsync(uri, HttpMethod.Delete, queryParams, headers, null, cancellationToken);
         }
 
         private static ClientOptions MergeOptions(ClientOptions options)
@@ -141,7 +139,7 @@ private async Task<HttpResponseMessage> SendAsync(
             Action<HttpRequestMessage> attachContent = null,
             CancellationToken cancellationToken = default)
         {
-            EnsureHttpClient();
+            using var client = GetHttpClient();
 
             requestUri = AddQueryString(requestUri, queryParams);
 
@@ -156,7 +154,7 @@ private async Task<HttpResponseMessage> SendAsync(
 
             attachContent?.Invoke(httpRequest);
 
-            var response = await _httpClient.SendAsync(httpRequest, cancellationToken);
+            var response = await client.SendAsync(httpRequest, cancellationToken);
 
             if (!response.IsSuccessStatusCode)
             {
@@ -174,17 +172,13 @@ private static void AddHeaders(HttpRequestMessage request, IDictionary<string, s
             }
         }
 
-        private void EnsureHttpClient()
+        private HttpClient GetHttpClient()
         {
-            if (_httpClient != null)
-            {
-                return;
-            }
-
             var pipeline = new LoggingHandler { InnerHandler = new HttpClientHandler() };
 
-            _httpClient = new HttpClient(pipeline);
-            _httpClient.BaseAddress = new Uri(_options.BaseUrl);
+            var httpClient = new HttpClient(pipeline);
+            httpClient.BaseAddress = new Uri(_options.BaseUrl);
+            return httpClient;
         }
 
         private static string AddQueryString(string uri, IEnumerable<KeyValuePair<string, string>> queryParams)