diff --git a/CHANGELOG.md b/CHANGELOG.md
index 931ce9a..da7181e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## [1.8.5] - 09.Aug.2024.
+- Update for Horizon API historical data changes
+
 ## [1.8.4] - 25.Jul.2024.
 - add: submit async transactions (Horizon v2.31.0)
 - soroban: add getTransactions, getFeeStats, getVersionInfo (RPC v21.4.0)
diff --git a/README.md b/README.md
index 2d14ca9..3ce5f3b 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ The Soneso open source Stellar SDK for Flutter is build with Dart and provides A
 1. Add the dependency to your pubspec.yaml file:
 ```
 dependencies:
-  stellar_flutter_sdk: ^1.8.4
+  stellar_flutter_sdk: ^1.8.5
 ```
 2. Install it (command line or IDE):
 ```
diff --git a/lib/src/responses/claimable_balance_response.dart b/lib/src/responses/claimable_balance_response.dart
index 27c73ff..43ee8e1 100644
--- a/lib/src/responses/claimable_balance_response.dart
+++ b/lib/src/responses/claimable_balance_response.dart
@@ -12,7 +12,7 @@ class ClaimableBalanceResponse extends Response {
   String amount;
   String? sponsor;
   int lastModifiedLedger;
-  String lastModifiedTime;
+  String? lastModifiedTime;
   List<ClaimantResponse> claimants;
   ClaimableBalanceResponseLinks links;
   ClaimableBalanceFlags flags;
diff --git a/lib/src/stellar_sdk.dart b/lib/src/stellar_sdk.dart
index 1a2b4cc..c3cd5e0 100644
--- a/lib/src/stellar_sdk.dart
+++ b/lib/src/stellar_sdk.dart
@@ -31,7 +31,7 @@ import 'requests/liquidity_pools_request_builder.dart';
 
 /// Main class of the flutter stellar sdk.
 class StellarSDK {
-  static const versionNumber = "1.8.4";
+  static const versionNumber = "1.8.5";
 
   static final StellarSDK PUBLIC = StellarSDK("https://horizon.stellar.org");
   static final StellarSDK TESTNET =
diff --git a/pubspec.yaml b/pubspec.yaml
index 3bd22b4..1166bbc 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: stellar_flutter_sdk
 description: A stellar blockchain sdk that query's horizon, build, signs and submits transactions to the stellar network.
-version: 1.8.4
+version: 1.8.5
 homepage: https://github.com/Soneso/stellar_flutter_sdk
 
 environment: