diff --git a/javatests/google/registry/rde/BUILD b/javatests/google/registry/rde/BUILD
index b1853744b..80dd899a9 100644
--- a/javatests/google/registry/rde/BUILD
+++ b/javatests/google/registry/rde/BUILD
@@ -54,7 +54,7 @@ java_library(
 GenTestRules(
     name = "GeneratedTestRules",
     default_test_size = "medium",
-    shard_count = 3,
+    shard_count = 4,
     test_files = glob(["*Test.java"]),
     deps = [":rde"],
 )
diff --git a/javatests/google/registry/rde/BrdaCopyActionTest.java b/javatests/google/registry/rde/BrdaCopyActionTest.java
index f53e5116f..c338fd46c 100644
--- a/javatests/google/registry/rde/BrdaCopyActionTest.java
+++ b/javatests/google/registry/rde/BrdaCopyActionTest.java
@@ -35,6 +35,7 @@ import google.registry.testing.BouncyCastleProviderRule;
 import google.registry.testing.GcsTestingUtils;
 import google.registry.testing.GpgSystemCommandRule;
 import google.registry.testing.Providers;
+import google.registry.testing.ShardableTestCase;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
@@ -53,7 +54,7 @@ import org.junit.runners.JUnit4;
 
 /** Unit tests for {@link BrdaCopyAction}. */
 @RunWith(JUnit4.class)
-public class BrdaCopyActionTest {
+public class BrdaCopyActionTest extends ShardableTestCase {
 
   private static final ByteSource DEPOSIT_XML = RdeTestData.get("deposit_full.xml");  // 2010-10-17
 
diff --git a/javatests/google/registry/rde/RdeMarshallerTest.java b/javatests/google/registry/rde/RdeMarshallerTest.java
index c0ac45af5..510408ea3 100644
--- a/javatests/google/registry/rde/RdeMarshallerTest.java
+++ b/javatests/google/registry/rde/RdeMarshallerTest.java
@@ -18,6 +18,7 @@ import static com.google.common.truth.Truth.assertThat;
 
 import google.registry.model.registrar.Registrar;
 import google.registry.testing.AppEngineRule;
+import google.registry.testing.ShardableTestCase;
 import google.registry.xml.XmlTestUtils;
 import org.joda.time.DateTime;
 import org.joda.time.format.ISODateTimeFormat;
@@ -28,7 +29,7 @@ import org.junit.runners.JUnit4;
 
 /** Unit tests for {@link RdeMarshaller}. */
 @RunWith(JUnit4.class)
-public class RdeMarshallerTest {
+public class RdeMarshallerTest extends ShardableTestCase {
 
   private static final String DECLARATION =
       "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n";