diff --git a/src/Microsoft.FeatureManagement/ConfigurationFeatureDefinitionProvider.cs b/src/Microsoft.FeatureManagement/ConfigurationFeatureDefinitionProvider.cs
index 3ae10329..ebd1c621 100644
--- a/src/Microsoft.FeatureManagement/ConfigurationFeatureDefinitionProvider.cs
+++ b/src/Microsoft.FeatureManagement/ConfigurationFeatureDefinitionProvider.cs
@@ -58,12 +58,12 @@ public ConfigurationFeatureDefinitionProvider(IConfiguration configuration)
         /// <summary>
         /// The option that controls the behavior when "FeatureManagement" section in the configuration is missing.
         /// </summary>
-        public bool RootConfigurationFallbackEnabled { get; init; }
+        public bool RootConfigurationFallbackEnabled { get; set; }
 
         /// <summary>
         /// The logger for the configuration feature definition provider.
         /// </summary>
-        public ILogger Logger { get; init; }
+        public ILogger Logger { get; set; }
 
         /// <summary>
         /// Disposes the change subscription of the configuration.
diff --git a/src/Microsoft.FeatureManagement/FeatureFilters/TimeWindowFilter.cs b/src/Microsoft.FeatureManagement/FeatureFilters/TimeWindowFilter.cs
index 121bb4cf..fb1f6f01 100644
--- a/src/Microsoft.FeatureManagement/FeatureFilters/TimeWindowFilter.cs
+++ b/src/Microsoft.FeatureManagement/FeatureFilters/TimeWindowFilter.cs
@@ -34,12 +34,12 @@ public TimeWindowFilter(ILoggerFactory loggerFactory = null)
         /// <summary>
         /// The application memory cache to store the start time of the closest active time window. By caching this time, the time window can minimize redundant computations when evaluating recurrence.
         /// </summary>
-        public IMemoryCache Cache { get; init; }
+        public IMemoryCache Cache { get; set; }
 
         /// <summary>
         /// This property allows the time window filter in our test suite to use simulated time.
         /// </summary>
-        internal ISystemClock SystemClock { get; init; }
+        internal ISystemClock SystemClock { get; set; }
 
         /// <summary>
         /// Binds configuration representing filter parameters to <see cref="TimeWindowFilterSettings"/>.
diff --git a/src/Microsoft.FeatureManagement/FeatureManager.cs b/src/Microsoft.FeatureManagement/FeatureManager.cs
index ef850a03..9080929d 100644
--- a/src/Microsoft.FeatureManagement/FeatureManager.cs
+++ b/src/Microsoft.FeatureManagement/FeatureManager.cs
@@ -21,11 +21,11 @@ public sealed class FeatureManager : IFeatureManager
         private readonly TimeSpan ParametersCacheAbsoluteExpirationRelativeToNow = TimeSpan.FromDays(1);
 
         private readonly IFeatureDefinitionProvider _featureDefinitionProvider;
-        private readonly IEnumerable<IFeatureFilterMetadata> _featureFilters;
-        private readonly IEnumerable<ISessionManager> _sessionManagers;
         private readonly ConcurrentDictionary<string, IFeatureFilterMetadata> _filterMetadataCache;
         private readonly ConcurrentDictionary<string, ContextualFeatureFilterEvaluator> _contextualFeatureFilterCache;
         private readonly FeatureManagementOptions _options;
+        private IEnumerable<IFeatureFilterMetadata> _featureFilters;
+        private IEnumerable<ISessionManager> _sessionManagers;
 
         private class ConfigurationCacheItem
         {
@@ -60,7 +60,7 @@ public IEnumerable<IFeatureFilterMetadata> FeatureFilters
         {
             get => _featureFilters;
 
-            init
+            set
             {
                 _featureFilters = value ?? throw new ArgumentNullException(nameof(value));
             }
@@ -74,7 +74,7 @@ public IEnumerable<ISessionManager> SessionManagers
         {
             get => _sessionManagers;
 
-            init
+            set
             {
                 _sessionManagers = value ?? throw new ArgumentNullException(nameof(value));
             }
@@ -83,12 +83,12 @@ public IEnumerable<ISessionManager> SessionManagers
         /// <summary>
         /// The application memory cache to store feature filter settings.
         /// </summary>
-        public IMemoryCache Cache { get; init; }
+        public IMemoryCache Cache { get; set; }
 
         /// <summary>
         /// The logger for the feature manager.
         /// </summary>
-        public ILogger Logger { get; init; }
+        public ILogger Logger { get; set; }
 
         /// <summary>
         /// Checks whether a given feature is enabled.
diff --git a/src/Microsoft.FeatureManagement/IsExternalInit.cs b/src/Microsoft.FeatureManagement/IsExternalInit.cs
deleted file mode 100644
index 2798741c..00000000
--- a/src/Microsoft.FeatureManagement/IsExternalInit.cs
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright (c) Microsoft Corporation.
-// Licensed under the MIT license.
-//
-
-// The init accessor for properties is supported in C# 9.0 and later.
-// This class is used to compile .NET frameworks that don't support C# 9.0 or later while still using the init accessor for a property.
-// The code referenced for this file can be found here: https://github.com/dotnet/roslyn/issues/45510#issuecomment-725091019
-
-#if NETSTANDARD2_0 || NETSTANDARD2_1
-
-using System.ComponentModel;
-
-namespace System.Runtime.CompilerServices
-{
-    [EditorBrowsable(EditorBrowsableState.Never)]
-    internal static class IsExternalInit
-    {
-    }
-}
-
-#endif
diff --git a/src/Microsoft.FeatureManagement/Microsoft.FeatureManagement.csproj b/src/Microsoft.FeatureManagement/Microsoft.FeatureManagement.csproj
index 528a3448..ea79919a 100644
--- a/src/Microsoft.FeatureManagement/Microsoft.FeatureManagement.csproj
+++ b/src/Microsoft.FeatureManagement/Microsoft.FeatureManagement.csproj
@@ -15,7 +15,9 @@
     <SignAssembly>true</SignAssembly>
     <DelaySign>false</DelaySign>
     <AssemblyOriginatorKeyFile>..\..\build\Microsoft.FeatureManagement.snk</AssemblyOriginatorKeyFile>
-    <LangVersion>9.0</LangVersion>
+    <!-- Microsoft.FeatureManagement uses the feature of async streams which is not supported in versions of C# earlier than 8.0. 
+        The library targets on netstandard 2.0. To ensure compatibility, the minimum language version requirement should be maintained. -->
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
 
   <PropertyGroup>