diff --git a/AwsCryptographyPrimitives/runtimes/net/Crypto.csproj b/AwsCryptographyPrimitives/runtimes/net/Crypto.csproj
index 7006996854..c563eaa15b 100644
--- a/AwsCryptographyPrimitives/runtimes/net/Crypto.csproj
+++ b/AwsCryptographyPrimitives/runtimes/net/Crypto.csproj
@@ -57,7 +57,7 @@
 
 
   <ItemGroup>
-    <PackageReference Include="AWSSDK.Core" Version="3.7.304.2" />
+    <PackageReference Include="AWSSDK.Core" Version="4.0.0.21" />
     <PackageReference Include="DafnyRuntime" Version="[4.2.0,$(DafnyVersion)]" />
     <PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />
     <ProjectReference Include="../../../StandardLibrary/runtimes/net/STD.csproj" />