diff --git a/AwsEncryptionSDK/runtimes/java/build.gradle.kts b/AwsEncryptionSDK/runtimes/java/build.gradle.kts
index 86db09935..b3ee86fd0 100644
--- a/AwsEncryptionSDK/runtimes/java/build.gradle.kts
+++ b/AwsEncryptionSDK/runtimes/java/build.gradle.kts
@@ -28,7 +28,7 @@ repositories {
 dependencies {
     implementation("org.dafny:DafnyRuntime:${dafnyVersion}")
     implementation("software.amazon.smithy.dafny:conversion:0.1")
-    implementation("software.amazon.cryptography:aws-cryptographic-material-providers:1.0.1")
+    implementation("software.amazon.cryptography:aws-cryptographic-material-providers:1.4.0")
 
     // Use JUnit test framework.
     testImplementation("junit:junit:4.13.2")
diff --git a/AwsEncryptionSDK/runtimes/net/ESDK.csproj b/AwsEncryptionSDK/runtimes/net/ESDK.csproj
index 5d375c521..71d8aa95b 100644
--- a/AwsEncryptionSDK/runtimes/net/ESDK.csproj
+++ b/AwsEncryptionSDK/runtimes/net/ESDK.csproj
@@ -30,9 +30,9 @@
 
   <ItemGroup>
       <!-- TODO: manually upgraded to match the latest from MPL, is that reasonable? -->
-      <PackageReference Include="AWSSDK.Core" Version="3.7.300.2" />
+      <PackageReference Include="AWSSDK.Core" Version="3.7.*" />
       <PackageReference Include="DafnyRuntime" Version="4.2.0" />
-      <PackageReference Include="BouncyCastle.Cryptography" Version="2.2.1" />
+      <PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />
       <ProjectReference Include="../../../mpl/AwsCryptographicMaterialProviders/runtimes/net/MPL.csproj" />
       <!--
         System.Collections.Immutable can be removed once dafny.msbuild is updated with
diff --git a/mpl b/mpl
index 6d0f00dfa..b6d28dcd6 160000
--- a/mpl
+++ b/mpl
@@ -1 +1 @@
-Subproject commit 6d0f00dfa8c31d490d89399cc104e7d4eac5b9b4
+Subproject commit b6d28dcd6968b00fa200fc0d51a1c83f437191ab