diff --git a/CHANGELOG.md b/CHANGELOG.md
index 16be8731f..307977c93 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,14 @@
 # Changelog
 Running changelog of releases since `3.1.1`
 
+
+## v5.2.1
+
+### Update
+
+- Remove FlexibleConfiguration dependency and use .NET Configuration Providers instead.
+
+
 ## v5.2.0
 
 ### Features
diff --git a/src/Okta.Sdk/Okta.Sdk.csproj b/src/Okta.Sdk/Okta.Sdk.csproj
index 6854be7c7..24d489d30 100644
--- a/src/Okta.Sdk/Okta.Sdk.csproj
+++ b/src/Okta.Sdk/Okta.Sdk.csproj
@@ -2,14 +2,15 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;netstandard2.1;netcoreapp3.1</TargetFrameworks>
-    <Version>5.2.0</Version>
+    <Version>5.2.1</Version>
     <LangVersion>7.3</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="FlexibleConfiguration" Version="2.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="5.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="5.0.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+    <PackageReference Include="Okta.Sdk.Abstractions" Version="4.0.2" />
     <PackageReference Include="System.Diagnostics.TraceSource" Version="4.3.0" />
     <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="6.11.1" />
     <PackageReference Include="System.Interactive.Async" Version="5.0.0" />
diff --git a/src/Okta.Sdk/OktaClient.cs b/src/Okta.Sdk/OktaClient.cs
index 1b28d02ad..40a25a123 100644
--- a/src/Okta.Sdk/OktaClient.cs
+++ b/src/Okta.Sdk/OktaClient.cs
@@ -10,9 +10,12 @@
 using System.Text.RegularExpressions;
 using System.Threading;
 using System.Threading.Tasks;
-using FlexibleConfiguration;
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Abstractions;
+using Okta.Sdk.Abstractions.Configuration.Providers.EnvironmentVariables;
+using Okta.Sdk.Abstractions.Configuration.Providers.Object;
+using Okta.Sdk.Abstractions.Configuration.Providers.Yaml;
 using Okta.Sdk.Configuration;
 using Okta.Sdk.Internal;