diff --git a/apps/ios/Shared/Views/Chat/ChatInfoView.swift b/apps/ios/Shared/Views/Chat/ChatInfoView.swift
index 0e1060fc88..52e0ca9e2f 100644
--- a/apps/ios/Shared/Views/Chat/ChatInfoView.swift
+++ b/apps/ios/Shared/Views/Chat/ChatInfoView.swift
@@ -65,12 +65,16 @@ struct ChatInfoView: View {
         case deleteContactAlert
         case clearChatAlert
         case networkStatusAlert
+        case switchAddressAlert
+        case error(title: LocalizedStringKey, error: LocalizedStringKey = "")
 
         var id: String {
             switch self {
             case .deleteContactAlert: return "deleteContactAlert"
             case .clearChatAlert: return "clearChatAlert"
             case .networkStatusAlert: return "networkStatusAlert"
+            case .switchAddressAlert: return "switchAddressAlert"
+            case let .error(title, _): return "error \(title)"
             }
         }
     }
@@ -100,8 +104,10 @@ struct ChatInfoView: View {
                         .onTapGesture {
                             alert = .networkStatusAlert
                         }
-                    Button("Switch receiving address") {
-                        
+                    if developerTools {
+                        Button("Switch receiving address (BETA)") {
+                            alert = .switchAddressAlert
+                        }
                     }
                     if let connStats = connectionStats {
                         smpServers("Receiving via", connStats.rcvServers)
@@ -129,6 +135,8 @@ struct ChatInfoView: View {
             case .deleteContactAlert: return deleteContactAlert()
             case .clearChatAlert: return clearChatAlert()
             case .networkStatusAlert: return networkStatusAlert()
+            case .switchAddressAlert: return switchAddressAlert(switchContactAddress)
+            case let .error(title, error): return mkAlert(title: title, message: error)
             }
         }
     }
@@ -236,7 +244,11 @@ struct ChatInfoView: View {
                             dismiss()
                         }
                     } catch let error {
-                        logger.error("deleteContactAlert apiDeleteChat error: \(error.localizedDescription)")
+                        logger.error("deleteContactAlert apiDeleteChat error: \(responseError(error))")
+                        let a = getErrorAlert(error, "Error deleting contact")
+                        await MainActor.run {
+                            alert = .error(title: a.title, error: a.message)
+                        }
                     }
                 }
             },
@@ -264,6 +276,29 @@ struct ChatInfoView: View {
             message: Text(chat.serverInfo.networkStatus.statusExplanation)
         )
     }
+
+    private func switchContactAddress() {
+        Task {
+            do {
+                try await apiSwitchContact(contactId: contact.apiId)
+            } catch let error {
+                logger.error("switchContactAddress apiSwitchContact error: \(responseError(error))")
+                let a = getErrorAlert(error, "Error changing address")
+                await MainActor.run {
+                    alert = .error(title: a.title, error: a.message)
+                }
+            }
+        }
+    }
+}
+
+func switchAddressAlert(_ switchAddress: @escaping () -> Void) -> Alert {
+    Alert(
+        title: Text("Change receiving address?"),
+        message: Text("This feature is experimental! It will only work if the other client has version 4.2 installed. You should see the message in the conversation once the address change is completed – please check that you can still receive messages from this contact (or group member)."),
+        primaryButton: .destructive(Text("Change"), action: switchAddress),
+        secondaryButton: .cancel()
+    )
 }
 
 struct ChatInfoView_Previews: PreviewProvider {
diff --git a/apps/ios/Shared/Views/Chat/Group/GroupMemberInfoView.swift b/apps/ios/Shared/Views/Chat/Group/GroupMemberInfoView.swift
index 24ca39f7d2..e80562b507 100644
--- a/apps/ios/Shared/Views/Chat/Group/GroupMemberInfoView.swift
+++ b/apps/ios/Shared/Views/Chat/Group/GroupMemberInfoView.swift
@@ -22,12 +22,14 @@ struct GroupMemberInfoView: View {
     enum GroupMemberInfoViewAlert: Identifiable {
         case removeMemberAlert
         case changeMemberRoleAlert(role: GroupMemberRole)
+        case switchAddressAlert
         case error(title: LocalizedStringKey, error: LocalizedStringKey)
 
         var id: String {
             switch self {
             case .removeMemberAlert: return "removeMemberAlert"
             case let .changeMemberRoleAlert(role): return "changeMemberRoleAlert \(role.rawValue)"
+            case .switchAddressAlert: return "switchAddressAlert"
             case let .error(title, _): return "error \(title)"
             }
         }
@@ -79,8 +81,10 @@ struct GroupMemberInfoView: View {
 
                 Section("Servers") {
                     // TODO network connection status
-                    Button("Switch receiving address") {
-                        
+                    if developerTools {
+                        Button("Switch receiving address (BETA)") {
+                            alert = .switchAddressAlert
+                        }
                     }
                     if let connStats = connectionStats {
                         smpServers("Receiving via", connStats.rcvServers)
@@ -108,6 +112,7 @@ struct GroupMemberInfoView: View {
             switch(alertItem) {
             case .removeMemberAlert: return removeMemberAlert()
             case .changeMemberRoleAlert: return changeMemberRoleAlert()
+            case .switchAddressAlert: return switchAddressAlert(switchMemberAddress)
             case let .error(title, error): return Alert(title: Text(title), message: Text(error))
             }
         }
@@ -213,6 +218,20 @@ struct GroupMemberInfoView: View {
             }
         )
     }
+
+    private func switchMemberAddress() {
+        Task {
+            do {
+                try await apiSwitchGroupMember(groupInfo.apiId, member.groupMemberId)
+            } catch let error {
+                logger.error("switchMemberAddress apiSwitchGroupMember error: \(responseError(error))")
+                let a = getErrorAlert(error, "Error changing address")
+                await MainActor.run {
+                    alert = .error(title: a.title, error: a.message)
+                }
+            }
+        }
+    }
 }
 
 struct GroupMemberInfoView_Previews: PreviewProvider {
diff --git a/cabal.project b/cabal.project
index 4aa17e4746..747e1993d8 100644
--- a/cabal.project
+++ b/cabal.project
@@ -7,7 +7,7 @@ constraints: zip +disable-bzip2 +disable-zstd
 source-repository-package
     type: git
     location: https://github.com/simplex-chat/simplexmq.git
-    tag: d9a0e78b04d2bdc79a197125b7cc104c309bdbd8
+    tag: 029fc6e781d78249d0b3a17edff7416ef22afed1
 
 source-repository-package
     type: git
diff --git a/scripts/nix/sha256map.nix b/scripts/nix/sha256map.nix
index 65bcb40e79..4a7d477d2f 100644
--- a/scripts/nix/sha256map.nix
+++ b/scripts/nix/sha256map.nix
@@ -1,5 +1,5 @@
 {
-  "https://github.com/simplex-chat/simplexmq.git"."d9a0e78b04d2bdc79a197125b7cc104c309bdbd8" = "08g686fnzmimiqfv1lqjphafkvw858dip1awg137days5sb5rqsf";
+  "https://github.com/simplex-chat/simplexmq.git"."029fc6e781d78249d0b3a17edff7416ef22afed1" = "054bjknwr75n7rpi4q41x966mnf4903rvy402vwyp1y9njzbd20q";
   "https://github.com/simplex-chat/direct-sqlcipher.git"."34309410eb2069b029b8fc1872deb1e0db123294" = "0kwkmhyfsn2lixdlgl15smgr1h5gjk7fky6abzh8rng2h5ymnffd";
   "https://github.com/simplex-chat/sqlcipher-simple.git"."5e154a2aeccc33ead6c243ec07195ab673137221" = "1d1gc5wax4vqg0801ajsmx1sbwvd9y7p7b8mmskvqsmpbwgbh0m0";
   "https://github.com/simplex-chat/aeson.git"."3eb66f9a68f103b5f1489382aad89f5712a64db7" = "0kilkx59fl6c3qy3kjczqvm8c3f4n3p0bdk9biyflf51ljnzp4yp";
diff --git a/src/Simplex/Chat/Messages.hs b/src/Simplex/Chat/Messages.hs
index bcde4cbd9d..4fe1ee4472 100644
--- a/src/Simplex/Chat/Messages.hs
+++ b/src/Simplex/Chat/Messages.hs
@@ -32,7 +32,7 @@ import GHC.Generics (Generic)
 import Simplex.Chat.Markdown
 import Simplex.Chat.Protocol
 import Simplex.Chat.Types
-import Simplex.Messaging.Agent.Protocol (SwitchPhase (..), AgentErrorType, AgentMsgId, MsgErrorType (..), MsgMeta (..), SwitchPhase)
+import Simplex.Messaging.Agent.Protocol (AgentErrorType, AgentMsgId, MsgErrorType (..), MsgMeta (..), SwitchPhase (..))
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers (dropPrefix, enumJSON, fromTextField_, fstToLower, singleFieldJSON, sumTypeJSON)
 import Simplex.Messaging.Protocol (MsgBody)
diff --git a/stack.yaml b/stack.yaml
index f0b28e81d5..54e655d763 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -49,7 +49,7 @@ extra-deps:
   # - simplexmq-1.0.0@sha256:34b2004728ae396e3ae449cd090ba7410781e2b3cefc59259915f4ca5daa9ea8,8561
   # - ../simplexmq
   - github: simplex-chat/simplexmq
-    commit: d9a0e78b04d2bdc79a197125b7cc104c309bdbd8
+    commit: 029fc6e781d78249d0b3a17edff7416ef22afed1
   # - ../direct-sqlcipher
   - github: simplex-chat/direct-sqlcipher
     commit: 34309410eb2069b029b8fc1872deb1e0db123294