diff --git a/AwsCryptographicMaterialProviders/runtimes/net/MPL.csproj b/AwsCryptographicMaterialProviders/runtimes/net/MPL.csproj
index d3f9d6446..f737db8e4 100644
--- a/AwsCryptographicMaterialProviders/runtimes/net/MPL.csproj
+++ b/AwsCryptographicMaterialProviders/runtimes/net/MPL.csproj
@@ -57,7 +57,7 @@
 
     <ItemGroup>
         <PackageReference Include="DafnyRuntime" Version="[4.2.0,$(DafnyVersion)]" />
-        <PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />
+        <PackageReference Include="BouncyCastle.Cryptography" Version="2.5.1" />
         <ProjectReference Include="../../../AwsCryptographyPrimitives/runtimes/net/Crypto.csproj" />
         <ProjectReference Include="../../../ComAmazonawsDynamodb/runtimes/net/ComAmazonawsDynamodb.csproj" />
         <ProjectReference Include="../../../ComAmazonawsKms/runtimes/net/AWS-KMS.csproj" />
diff --git a/AwsCryptographyPrimitives/runtimes/net/Crypto.csproj b/AwsCryptographyPrimitives/runtimes/net/Crypto.csproj
index b8d47fc34..f818f1599 100644
--- a/AwsCryptographyPrimitives/runtimes/net/Crypto.csproj
+++ b/AwsCryptographyPrimitives/runtimes/net/Crypto.csproj
@@ -59,7 +59,7 @@
   <ItemGroup>
     <PackageReference Include="AWSSDK.Core" Version="3.7.304.2" />
     <PackageReference Include="DafnyRuntime" Version="[4.2.0,$(DafnyVersion)]" />
-    <PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />
+    <PackageReference Include="BouncyCastle.Cryptography" Version="2.5.1" />
     <ProjectReference Include="../../../StandardLibrary/runtimes/net/STD.csproj" />
 
     <!--