diff --git a/DynamoDbEncryption/runtimes/net/DynamoDbEncryption.csproj b/DynamoDbEncryption/runtimes/net/DynamoDbEncryption.csproj
index 0ac4c9330..4f22b5d57 100644
--- a/DynamoDbEncryption/runtimes/net/DynamoDbEncryption.csproj
+++ b/DynamoDbEncryption/runtimes/net/DynamoDbEncryption.csproj
@@ -33,8 +33,8 @@
 
 
   <ItemGroup>
-    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.300.2"/>
-    <PackageReference Include="AWSSDK.Core" Version="3.7.300.2"/>
+    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.303.14"/>
+    <PackageReference Include="AWSSDK.Core" Version="3.7.304.7"/>
     <PackageReference Include="DafnyRuntime" Version="4.2.0" />
     <ProjectReference Include="../../../submodules/MaterialProviders/AwsCryptographicMaterialProviders/runtimes/net/MPL.csproj"/>
     <!--
diff --git a/TestVectors/runtimes/net/DbEsdkTestVectors.csproj b/TestVectors/runtimes/net/DbEsdkTestVectors.csproj
index 86c955f92..10fbf624d 100644
--- a/TestVectors/runtimes/net/DbEsdkTestVectors.csproj
+++ b/TestVectors/runtimes/net/DbEsdkTestVectors.csproj
@@ -11,8 +11,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.300.2"/>
-    <PackageReference Include="AWSSDK.Core" Version="3.7.300.2"/>
+    <PackageReference Include="AWSSDK.DynamoDBv2" Version="3.7.303.14"/>
+    <PackageReference Include="AWSSDK.Core" Version="3.7.304.7"/>
     <ProjectReference Include="../../../DynamoDbEncryption/runtimes/net/DynamoDbEncryption.csproj" />
     <ProjectReference Include="../../../submodules/MaterialProviders/TestVectorsAwsCryptographicMaterialProviders/runtimes/net/TestVectors.csproj" />
     <Compile Include="*.cs"/>
diff --git a/project.properties b/project.properties
index 991446ddc..010f6a408 100644
--- a/project.properties
+++ b/project.properties
@@ -1,4 +1,4 @@
 projectJavaVersion=3.4.0-SNAPSHOT
-mplDependencyJavaVersion=1.3.0
+mplDependencyJavaVersion=1.4.0
 dafnyRuntimeJavaVersion=4.2.0
 smithyDafnyJavaConversionVersion=0.1
diff --git a/submodules/MaterialProviders b/submodules/MaterialProviders
index 5f8d816df..b6d28dcd6 160000
--- a/submodules/MaterialProviders
+++ b/submodules/MaterialProviders
@@ -1 +1 @@
-Subproject commit 5f8d816df1febed28bed1ba6c63cc9c826ae61a8
+Subproject commit b6d28dcd6968b00fa200fc0d51a1c83f437191ab