diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/workers/MigrateSignedECPreKeysCommand.java b/service/src/main/java/org/whispersystems/textsecuregcm/workers/MigrateSignedECPreKeysCommand.java
index 877e8d857..fb2f65452 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/workers/MigrateSignedECPreKeysCommand.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/workers/MigrateSignedECPreKeysCommand.java
@@ -24,11 +24,9 @@ public class MigrateSignedECPreKeysCommand extends AbstractSinglePassCrawlAccoun
   private static final String STORE_KEY_ATTEMPT_COUNTER_NAME =
       MetricsUtil.name(MigrateSignedECPreKeysCommand.class, "storeKeyAttempt");
 
-  // It's tricky to find, but this is the default connection count for the AWS SDK's async DynamoDB client. We'll have
-  // multiple workers using the max number of connections, but that's okay because the client allows for (by default)
-  // 10,000 pending requests. As long as we don't have more than 200(!) workers, we'll be fine with this concurrency
-  // level.
-  private static final int MAX_CONCURRENCY = 50;
+  // It's tricky to find, but the default connection count for the AWS SDK's async DynamoDB client is 50. We expect
+  // four workers, so this should keep us below the concurrency limit.
+  private static final int MAX_CONCURRENCY = 12;
 
   public MigrateSignedECPreKeysCommand() {
     super("migrate-signed-ec-pre-keys", "Migrate signed EC pre-keys from Account records to a dedicated table");