diff --git a/demos/django-todolist/pubspec.lock b/demos/django-todolist/pubspec.lock
index ac133247..ead7f88f 100644
--- a/demos/django-todolist/pubspec.lock
+++ b/demos/django-todolist/pubspec.lock
@@ -262,7 +262,7 @@ packages:
       path: "../../packages/powersync"
       relative: true
     source: path
-    version: "1.5.0"
+    version: "1.5.3"
   powersync_flutter_libs:
     dependency: "direct overridden"
     description:
diff --git a/demos/supabase-anonymous-auth/pubspec.lock b/demos/supabase-anonymous-auth/pubspec.lock
index aad42402..9b694697 100644
--- a/demos/supabase-anonymous-auth/pubspec.lock
+++ b/demos/supabase-anonymous-auth/pubspec.lock
@@ -318,7 +318,7 @@ packages:
       path: "../../packages/powersync"
       relative: true
     source: path
-    version: "1.5.0"
+    version: "1.5.3"
   powersync_flutter_libs:
     dependency: "direct overridden"
     description:
diff --git a/demos/supabase-edge-function-auth/pubspec.lock b/demos/supabase-edge-function-auth/pubspec.lock
index aad42402..9b694697 100644
--- a/demos/supabase-edge-function-auth/pubspec.lock
+++ b/demos/supabase-edge-function-auth/pubspec.lock
@@ -318,7 +318,7 @@ packages:
       path: "../../packages/powersync"
       relative: true
     source: path
-    version: "1.5.0"
+    version: "1.5.3"
   powersync_flutter_libs:
     dependency: "direct overridden"
     description:
diff --git a/demos/supabase-simple-chat/pubspec.lock b/demos/supabase-simple-chat/pubspec.lock
index 5f7d683e..62390b64 100644
--- a/demos/supabase-simple-chat/pubspec.lock
+++ b/demos/supabase-simple-chat/pubspec.lock
@@ -358,7 +358,7 @@ packages:
       path: "../../packages/powersync"
       relative: true
     source: path
-    version: "1.5.0"
+    version: "1.5.3"
   powersync_flutter_libs:
     dependency: "direct overridden"
     description:
diff --git a/demos/supabase-simple-chat/pubspec.yaml b/demos/supabase-simple-chat/pubspec.yaml
index 7f73f8bf..33467f96 100644
--- a/demos/supabase-simple-chat/pubspec.yaml
+++ b/demos/supabase-simple-chat/pubspec.yaml
@@ -37,7 +37,7 @@ dependencies:
 
   supabase_flutter: ^1.10.25
   timeago: ^3.6.0
-  powersync: ^1.4.2
+  powersync: ^1.5.0
   path_provider: ^2.1.1
   path: ^1.8.3
   logging: ^1.2.0
diff --git a/demos/supabase-todolist/ios/Podfile.lock b/demos/supabase-todolist/ios/Podfile.lock
index 1be61f39..2b36a5a6 100644
--- a/demos/supabase-todolist/ios/Podfile.lock
+++ b/demos/supabase-todolist/ios/Podfile.lock
@@ -17,6 +17,8 @@ PODS:
   - "sqlite3 (3.46.0+1)":
     - "sqlite3/common (= 3.46.0+1)"
   - "sqlite3/common (3.46.0+1)"
+  - "sqlite3/dbstatvtab (3.46.0+1)":
+    - sqlite3/common
   - "sqlite3/fts5 (3.46.0+1)":
     - sqlite3/common
   - "sqlite3/perf-threadsafe (3.46.0+1)":
@@ -25,7 +27,8 @@ PODS:
     - sqlite3/common
   - sqlite3_flutter_libs (0.0.1):
     - Flutter
-    - sqlite3 (~> 3.46.0)
+    - "sqlite3 (~> 3.46.0+1)"
+    - sqlite3/dbstatvtab
     - sqlite3/fts5
     - sqlite3/perf-threadsafe
     - sqlite3/rtree
@@ -74,7 +77,7 @@ SPEC CHECKSUMS:
   powersync_flutter_libs: 5d6b132a398de442c0853a8b14bfbb62cd4ff5a1
   shared_preferences_foundation: b4c3b4cddf1c21f02770737f147a3f5da9d39695
   sqlite3: 292c3e1bfe89f64e51ea7fc7dab9182a017c8630
-  sqlite3_flutter_libs: 0d611efdf6d1c9297d5ab03dab21b75aeebdae31
+  sqlite3_flutter_libs: c00457ebd31e59fa6bb830380ddba24d44fbcd3b
   url_launcher_ios: 6116280ddcfe98ab8820085d8d76ae7449447586
 
 PODFILE CHECKSUM: f7b3cb7384a2d5da4b22b090e1f632de7f377987
diff --git a/demos/supabase-todolist/pubspec.lock b/demos/supabase-todolist/pubspec.lock
index 8e064ecc..8dd98be0 100644
--- a/demos/supabase-todolist/pubspec.lock
+++ b/demos/supabase-todolist/pubspec.lock
@@ -398,7 +398,7 @@ packages:
       path: "../../packages/powersync"
       relative: true
     source: path
-    version: "1.5.0"
+    version: "1.5.3"
   powersync_attachments_helper:
     dependency: "direct main"
     description:
diff --git a/packages/powersync/CHANGELOG.md b/packages/powersync/CHANGELOG.md
index fce52716..e0c18f20 100644
--- a/packages/powersync/CHANGELOG.md
+++ b/packages/powersync/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.5.3
+
+- Added support for client parameters when connecting.
+
 ## 1.5.2
 
 - Refactor `waitForFirstSync()` to iterate through the stream and remove the use of a `Future`.
diff --git a/packages/powersync/lib/src/powersync_database.dart b/packages/powersync/lib/src/powersync_database.dart
index 99e837ad..0dfd96d8 100644
--- a/packages/powersync/lib/src/powersync_database.dart
+++ b/packages/powersync/lib/src/powersync_database.dart
@@ -77,6 +77,8 @@ class PowerSyncDatabase with SqliteQueries implements SqliteConnection {
   /// Use [attachedLogger] to propagate logs to [Logger.root] for custom logging.
   late final Logger logger;
 
+  Map<String, dynamic>? clientParams;
+
   /// Open a [PowerSyncDatabase].
   ///
   /// Only a single [PowerSyncDatabase] per [path] should be opened at a time.
@@ -219,7 +221,8 @@ class PowerSyncDatabase with SqliteQueries implements SqliteConnection {
 
       /// Throttle time between CRUD operations
       /// Defaults to 10 milliseconds.
-      Duration crudThrottleTime = const Duration(milliseconds: 10)}) async {
+      Duration crudThrottleTime = const Duration(milliseconds: 10),
+      Map<String, dynamic>? params}) async {
     Zone current = Zone.current;
 
     Future<void> reconnect() {
@@ -228,7 +231,8 @@ class PowerSyncDatabase with SqliteQueries implements SqliteConnection {
           crudThrottleTime: crudThrottleTime,
           // The reconnect function needs to run in the original zone,
           // to avoid recursive lock errors.
-          reconnect: current.bindCallback(reconnect)));
+          reconnect: current.bindCallback(reconnect),
+          params: params));
     }
 
     await reconnect();
@@ -237,7 +241,9 @@ class PowerSyncDatabase with SqliteQueries implements SqliteConnection {
   Future<void> _connect(
       {required PowerSyncBackendConnector connector,
       required Duration crudThrottleTime,
-      required Future<void> Function() reconnect}) async {
+      required Future<void> Function() reconnect,
+      Map<String, dynamic>? params}) async {
+    clientParams = params;
     await initialize();
 
     // Disconnect if connected
@@ -330,8 +336,10 @@ class PowerSyncDatabase with SqliteQueries implements SqliteConnection {
       return;
     }
 
-    Isolate.spawn(_powerSyncDatabaseIsolate,
-        _PowerSyncDatabaseIsolateArgs(rPort.sendPort, dbref, retryDelay),
+    Isolate.spawn(
+        _powerSyncDatabaseIsolate,
+        _PowerSyncDatabaseIsolateArgs(
+            rPort.sendPort, dbref, retryDelay, clientParams),
         debugName: 'PowerSyncDatabase',
         onError: errorPort.sendPort,
         onExit: exitPort.sendPort);
@@ -562,8 +570,10 @@ class _PowerSyncDatabaseIsolateArgs {
   final SendPort sPort;
   final IsolateConnectionFactory dbRef;
   final Duration retryDelay;
+  final Map<String, dynamic>? parameters;
 
-  _PowerSyncDatabaseIsolateArgs(this.sPort, this.dbRef, this.retryDelay);
+  _PowerSyncDatabaseIsolateArgs(
+      this.sPort, this.dbRef, this.retryDelay, this.parameters);
 }
 
 Future<void> _powerSyncDatabaseIsolate(
@@ -638,7 +648,9 @@ Future<void> _powerSyncDatabaseIsolate(
         invalidCredentialsCallback: invalidateCredentials,
         uploadCrud: uploadCrud,
         updateStream: updateController.stream,
-        retryDelay: args.retryDelay);
+        retryDelay: args.retryDelay,
+        syncParameters: args.parameters);
+
     openedStreamingSync = sync;
     sync.streamingSync();
     sync.statusStream.listen((event) {
diff --git a/packages/powersync/lib/src/streaming_sync.dart b/packages/powersync/lib/src/streaming_sync.dart
index 71325377..5bc4d0a5 100644
--- a/packages/powersync/lib/src/streaming_sync.dart
+++ b/packages/powersync/lib/src/streaming_sync.dart
@@ -38,6 +38,8 @@ class StreamingSyncImplementation {
 
   final Duration retryDelay;
 
+  final Map<String, dynamic>? syncParameters;
+
   SyncStatus lastStatus = const SyncStatus();
 
   AbortController? _abort;
@@ -50,7 +52,8 @@ class StreamingSyncImplementation {
       this.invalidCredentialsCallback,
       required this.uploadCrud,
       required this.updateStream,
-      required this.retryDelay}) {
+      required this.retryDelay,
+      this.syncParameters}) {
     _client = http.Client();
     statusStream = _statusStreamController.stream;
   }
@@ -233,9 +236,9 @@ class StreamingSyncImplementation {
       initialBucketStates[entry.bucket] = entry.opId;
     }
 
-    final List<BucketRequest> req = [];
+    final List<BucketRequest> buckets = [];
     for (var entry in initialBucketStates.entries) {
-      req.add(BucketRequest(entry.key, entry.value));
+      buckets.add(BucketRequest(entry.key, entry.value));
     }
 
     Checkpoint? targetCheckpoint;
@@ -243,7 +246,8 @@ class StreamingSyncImplementation {
     Checkpoint? appliedCheckpoint;
     var bucketSet = Set<String>.from(initialBucketStates.keys);
 
-    var requestStream = streamingSyncRequest(StreamingSyncRequest(req));
+    var requestStream =
+        streamingSyncRequest(StreamingSyncRequest(buckets, syncParameters));
 
     var merged = addBroadcast(requestStream, _localPingController.stream);
 
diff --git a/packages/powersync/lib/src/sync_types.dart b/packages/powersync/lib/src/sync_types.dart
index 9dda592a..627d0987 100644
--- a/packages/powersync/lib/src/sync_types.dart
+++ b/packages/powersync/lib/src/sync_types.dart
@@ -112,15 +112,23 @@ Object? parseStreamingSyncLine(Map<String, dynamic> line) {
 class StreamingSyncRequest {
   List<BucketRequest> buckets;
   bool includeChecksum = true;
+  Map<String, dynamic>? parameters;
 
-  StreamingSyncRequest(this.buckets);
+  StreamingSyncRequest(this.buckets, this.parameters);
 
-  Map<String, dynamic> toJson() => {
-        'buckets': buckets,
-        'include_checksum': includeChecksum,
-        // We want the JSON row data as a string
-        'raw_data': true
-      };
+  Map<String, dynamic> toJson() {
+    final Map<String, dynamic> json = {
+      'buckets': buckets,
+      'include_checksum': includeChecksum,
+      'raw_data': true,
+    };
+
+    if (parameters != null) {
+      json['parameters'] = parameters;
+    }
+
+    return json;
+  }
 }
 
 class BucketRequest {
diff --git a/packages/powersync/pubspec.yaml b/packages/powersync/pubspec.yaml
index 071915ca..444649a1 100644
--- a/packages/powersync/pubspec.yaml
+++ b/packages/powersync/pubspec.yaml
@@ -1,5 +1,5 @@
 name: powersync
-version: 1.5.2
+version: 1.5.3
 homepage: https://powersync.com
 repository: https://github.com/powersync-ja/powersync.dart
 description: PowerSync Flutter SDK - keep PostgreSQL databases in sync with on-device SQLite databases.