diff --git a/platform-sdk/swirlds-platform-core/src/main/java/com/swirlds/platform/state/snapshot/SignedStateFileUtils.java b/platform-sdk/swirlds-platform-core/src/main/java/com/swirlds/platform/state/snapshot/SignedStateFileUtils.java
index b2353d2ff416..70fc8287d1fc 100644
--- a/platform-sdk/swirlds-platform-core/src/main/java/com/swirlds/platform/state/snapshot/SignedStateFileUtils.java
+++ b/platform-sdk/swirlds-platform-core/src/main/java/com/swirlds/platform/state/snapshot/SignedStateFileUtils.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2022-2024 Hedera Hashgraph, LLC
+ * Copyright (C) 2022-2025 Hedera Hashgraph, LLC
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,7 +30,7 @@ public final class SignedStateFileUtils {
     /**
      * The name of the file that contains the human-readable address book in the saved state
      */
-    public static final String CURRENT_ADDRESS_BOOK_FILE_NAME = "currentAddressBook.txt";
+    public static final String CURRENT_ROSTER_FILE_NAME = "currentRoster.json";
 
     /**
      * The initial version of the signature set file
diff --git a/platform-sdk/swirlds-platform-core/src/main/java/com/swirlds/platform/state/snapshot/SignedStateFileWriter.java b/platform-sdk/swirlds-platform-core/src/main/java/com/swirlds/platform/state/snapshot/SignedStateFileWriter.java
index 972c87c2bdbf..eb67a6616083 100644
--- a/platform-sdk/swirlds-platform-core/src/main/java/com/swirlds/platform/state/snapshot/SignedStateFileWriter.java
+++ b/platform-sdk/swirlds-platform-core/src/main/java/com/swirlds/platform/state/snapshot/SignedStateFileWriter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2024 Hedera Hashgraph, LLC
+ * Copyright (C) 2024-2025 Hedera Hashgraph, LLC
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,11 +22,12 @@
 import static com.swirlds.logging.legacy.LogMarker.STATE_TO_DISK;
 import static com.swirlds.platform.config.internal.PlatformConfigUtils.writeSettingsUsed;
 import static com.swirlds.platform.event.preconsensus.BestEffortPcesFileCopy.copyPcesFilesRetryOnFailure;
-import static com.swirlds.platform.state.snapshot.SignedStateFileUtils.CURRENT_ADDRESS_BOOK_FILE_NAME;
+import static com.swirlds.platform.state.snapshot.SignedStateFileUtils.CURRENT_ROSTER_FILE_NAME;
 import static com.swirlds.platform.state.snapshot.SignedStateFileUtils.HASH_INFO_FILE_NAME;
 import static com.swirlds.platform.state.snapshot.SignedStateFileUtils.INIT_SIG_SET_FILE_VERSION;
 import static com.swirlds.platform.state.snapshot.SignedStateFileUtils.SIGNATURE_SET_FILE_NAME;
 
+import com.hedera.hapi.node.state.roster.Roster;
 import com.swirlds.common.context.PlatformContext;
 import com.swirlds.common.io.streams.MerkleDataOutputStream;
 import com.swirlds.common.merkle.utility.MerkleTreeVisualizer;
@@ -34,11 +35,9 @@
 import com.swirlds.logging.legacy.payload.StateSavedToDiskPayload;
 import com.swirlds.platform.config.StateConfig;
 import com.swirlds.platform.recovery.emergencyfile.EmergencyRecoveryFile;
-import com.swirlds.platform.roster.RosterUtils;
 import com.swirlds.platform.state.PlatformMerkleStateRoot;
 import com.swirlds.platform.state.signed.SigSet;
 import com.swirlds.platform.state.signed.SignedState;
-import com.swirlds.platform.system.address.AddressBook;
 import edu.umd.cs.findbugs.annotations.NonNull;
 import edu.umd.cs.findbugs.annotations.Nullable;
 import java.io.BufferedWriter;
@@ -157,9 +156,9 @@ public static void writeSignedStateFilesToDirectory(
         writeHashInfoFile(platformContext, directory, signedState.getState());
         writeMetadataFile(selfId, directory, signedState);
         writeEmergencyRecoveryFile(directory, signedState);
-        if (!signedState.isGenesisState()) {
-            // Genesis states do not have address books.
-            writeStateAddressBookFile(directory, RosterUtils.buildAddressBook(signedState.getRoster()));
+        final Roster currentRoster = signedState.getRoster();
+        if (currentRoster != null) {
+            writeRosterFile(directory, currentRoster);
         }
         writeSettingsUsed(directory, platformContext.getConfiguration());
 
@@ -174,17 +173,17 @@ public static void writeSignedStateFilesToDirectory(
     }
 
     /**
-     * Write the state's address book in human-readable form.
+     * Write the state's roster in human-readable form.
      *
-     * @param directory   the directory to write to
-     * @param addressBook the address book to write
+     * @param directory the directory to write to
+     * @param roster    the roster to write
      */
-    private static void writeStateAddressBookFile(@NonNull final Path directory, @NonNull final AddressBook addressBook)
+    private static void writeRosterFile(@NonNull final Path directory, @NonNull final Roster roster)
             throws IOException {
-        final Path addressBookFile = directory.resolve(CURRENT_ADDRESS_BOOK_FILE_NAME);
+        final Path rosterFile = directory.resolve(CURRENT_ROSTER_FILE_NAME);
 
-        try (final BufferedWriter writer = new BufferedWriter(new FileWriter(addressBookFile.toFile()))) {
-            writer.write(addressBook.toConfigText());
+        try (final BufferedWriter writer = new BufferedWriter(new FileWriter(rosterFile.toFile()))) {
+            writer.write(Roster.JSON.toJSON(roster));
         }
     }
 
diff --git a/platform-sdk/swirlds-platform-core/src/test/java/com/swirlds/platform/SignedStateFileReadWriteTest.java b/platform-sdk/swirlds-platform-core/src/test/java/com/swirlds/platform/SignedStateFileReadWriteTest.java
index 565be305c90d..b1731d4fdc2b 100644
--- a/platform-sdk/swirlds-platform-core/src/test/java/com/swirlds/platform/SignedStateFileReadWriteTest.java
+++ b/platform-sdk/swirlds-platform-core/src/test/java/com/swirlds/platform/SignedStateFileReadWriteTest.java
@@ -18,7 +18,7 @@
 
 import static com.swirlds.common.io.utility.FileUtils.throwIfFileExists;
 import static com.swirlds.platform.state.snapshot.SignedStateFileReader.readStateFile;
-import static com.swirlds.platform.state.snapshot.SignedStateFileUtils.CURRENT_ADDRESS_BOOK_FILE_NAME;
+import static com.swirlds.platform.state.snapshot.SignedStateFileUtils.CURRENT_ROSTER_FILE_NAME;
 import static com.swirlds.platform.state.snapshot.SignedStateFileUtils.HASH_INFO_FILE_NAME;
 import static com.swirlds.platform.state.snapshot.SignedStateFileUtils.SIGNATURE_SET_FILE_NAME;
 import static com.swirlds.platform.state.snapshot.SignedStateFileWriter.writeHashInfoFile;
@@ -173,7 +173,7 @@ void writeSavedStateToDiskTest() throws IOException {
         final Path stateFile = directory.resolve(SIGNED_STATE_FILE_NAME);
         final Path hashInfoFile = directory.resolve(HASH_INFO_FILE_NAME);
         final Path settingsUsedFile = directory.resolve("settingsUsed.txt");
-        final Path addressBookFile = directory.resolve(CURRENT_ADDRESS_BOOK_FILE_NAME);
+        final Path addressBookFile = directory.resolve(CURRENT_ROSTER_FILE_NAME);
 
         throwIfFileExists(stateFile, hashInfoFile, settingsUsedFile, directory);
         final String configDir = testDirectory.resolve("data/saved").toString();