diff --git a/source/Ldap.Integration.Tests/Ldap.Integration.Tests.csproj b/source/Ldap.Integration.Tests/Ldap.Integration.Tests.csproj
index 1aeff8f..6610640 100644
--- a/source/Ldap.Integration.Tests/Ldap.Integration.Tests.csproj
+++ b/source/Ldap.Integration.Tests/Ldap.Integration.Tests.csproj
@@ -8,7 +8,7 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
-        <PackageReference Include="NSubstitute" Version="4.2.2" />
+        <PackageReference Include="NSubstitute" Version="4.4.0" />
         <PackageReference Include="xunit" Version="2.4.1" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
diff --git a/source/Ldap.Tests/Ldap.Tests.csproj b/source/Ldap.Tests/Ldap.Tests.csproj
index 1aeff8f..6610640 100644
--- a/source/Ldap.Tests/Ldap.Tests.csproj
+++ b/source/Ldap.Tests/Ldap.Tests.csproj
@@ -8,7 +8,7 @@
 
     <ItemGroup>
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+        <PackageReference Include="NSubstitute" Version="4.4.0" />
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         <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
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