diff --git a/Sources/PostgREST/PostgrestClient.swift b/Sources/PostgREST/PostgrestClient.swift
index 4172c7fa..a2b52677 100644
--- a/Sources/PostgREST/PostgrestClient.swift
+++ b/Sources/PostgREST/PostgrestClient.swift
@@ -53,7 +53,7 @@ public final class PostgrestClient: Sendable {
     }
   }
 
-  let _configuration: LockIsolated<Configuration>
+  private let _configuration: LockIsolated<Configuration>
   public var configuration: Configuration { _configuration.value }
 
   /// Creates a PostgREST client with the specified configuration.
diff --git a/Sources/Realtime/V2/CallbackManager.swift b/Sources/Realtime/V2/CallbackManager.swift
index 33d5537a..557ba6b3 100644
--- a/Sources/Realtime/V2/CallbackManager.swift
+++ b/Sources/Realtime/V2/CallbackManager.swift
@@ -16,7 +16,7 @@ final class CallbackManager: @unchecked Sendable {
     var callbacks: [RealtimeCallback] = []
   }
 
-  let mutableState = LockIsolated(MutableState())
+  private let mutableState = LockIsolated(MutableState())
 
   @discardableResult
   func addBroadcastCallback(
diff --git a/Sources/Realtime/V2/WebSocketClient.swift b/Sources/Realtime/V2/WebSocketClient.swift
index 435a35a6..331ef710 100644
--- a/Sources/Realtime/V2/WebSocketClient.swift
+++ b/Sources/Realtime/V2/WebSocketClient.swift
@@ -42,7 +42,7 @@ final class WebSocket: NSObject, URLSessionWebSocketDelegate, WebSocketClient, @
     var stream: SocketStream?
   }
 
-  let mutableState = LockIsolated(MutableState())
+  private let mutableState = LockIsolated(MutableState())
 
   init(config: RealtimeClientV2.Configuration) {
     realtimeURL = config.realtimeWebSocketURL
diff --git a/Sources/_Helpers/EventEmitter.swift b/Sources/_Helpers/EventEmitter.swift
index c58dac1e..3e24c12b 100644
--- a/Sources/_Helpers/EventEmitter.swift
+++ b/Sources/_Helpers/EventEmitter.swift
@@ -30,7 +30,7 @@ public final class ObservationToken: Sendable {
 package final class EventEmitter<Event: Sendable>: Sendable {
   public typealias Listener = @Sendable (Event) -> Void
 
-  let listeners = LockIsolated<[ObjectIdentifier: Listener]>([:])
+  private let listeners = LockIsolated<[ObjectIdentifier: Listener]>([:])
   public let lastEvent: LockIsolated<Event>
 
   let emitsLastEventWhenAttaching: Bool