diff --git a/aws-encryption-sdk-net/Source/AWSEncryptionSDK.csproj b/aws-encryption-sdk-net/Source/AWSEncryptionSDK.csproj
index ebe10f54b..710fed052 100644
--- a/aws-encryption-sdk-net/Source/AWSEncryptionSDK.csproj
+++ b/aws-encryption-sdk-net/Source/AWSEncryptionSDK.csproj
@@ -36,7 +36,7 @@
   <ItemGroup>
     <PackageReference Include="AWSSDK.Core" Version="3.7.9.2" />
     <PackageReference Include="AWSSDK.KeyManagementService" Version="3.7.2" />
-    <PackageReference Include="Portable.BouncyCastle" Version="1.8.5.2" />
+    <PackageReference Include="BouncyCastle.Cryptography" Version="2.2.1" />
     <!--
       System.Collections.Immutable can be removed once dafny.msbuild is updated with
       https://github.com/dafny-lang/dafny.msbuild/pull/10 and versioned
diff --git a/aws-encryption-sdk-net/Test/AWSEncryptionSDKTests.csproj b/aws-encryption-sdk-net/Test/AWSEncryptionSDKTests.csproj
index 8a77149c0..0d5dd8ca7 100644
--- a/aws-encryption-sdk-net/Test/AWSEncryptionSDKTests.csproj
+++ b/aws-encryption-sdk-net/Test/AWSEncryptionSDKTests.csproj
@@ -60,7 +60,7 @@
   <ItemGroup>
     <PackageReference Include="AWSSDK.Core" Version="3.7.9" />
     <PackageReference Include="AWSSDK.KeyManagementService" Version="3.7.2.83" />
-    <PackageReference Include="Portable.BouncyCastle" Version="1.8.5.2" />
+    <PackageReference Include="BouncyCastle.Cryptography" Version="2.2.1" />
     <!-- Work around for dafny-lang/dafny/issues/1951; remove once resolved -->
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>