diff --git a/Session/View Controllers/HomeVC.swift b/Session/View Controllers/HomeVC.swift
index 940766973..8664d5f16 100644
--- a/Session/View Controllers/HomeVC.swift	
+++ b/Session/View Controllers/HomeVC.swift	
@@ -161,6 +161,20 @@ final class HomeVC : BaseVC, UITableViewDataSource, UITableViewDelegate, UIScrol
         super.viewDidAppear(animated)
         isViewVisible = true
         UserDefaults.standard[.hasLaunchedOnce] = true
+        showKeyPairMigrationNudgeIfNeeded()
+    }
+    
+    private func showKeyPairMigrationNudgeIfNeeded() {
+        guard !KeyPairUtilities.hasV2KeyPair() else { return }
+        let lastNudge = UserDefaults.standard[.lastKeyPairMigrationNudge]
+        let nudgeInterval: Double = 3 * 24 * 60 * 60 // 3 days
+        let nudge = given(lastNudge) { Date().timeIntervalSince($0) > nudgeInterval } ?? true
+        guard nudge else { return }
+        let sheet = KeyPairMigrationSheet()
+        sheet.modalPresentationStyle = .overFullScreen
+        sheet.modalTransitionStyle = .crossDissolve
+        present(sheet, animated: true, completion: nil)
+        UserDefaults.standard[.lastKeyPairMigrationNudge] = Date()
     }
     
     override func viewWillDisappear(_ animated: Bool) {
diff --git a/Session/View Controllers/KeyPairMigrationSheet.swift b/Session/View Controllers/KeyPairMigrationSheet.swift
new file mode 100644
index 000000000..154ae8c19
--- /dev/null
+++ b/Session/View Controllers/KeyPairMigrationSheet.swift	
@@ -0,0 +1,48 @@
+
+final class KeyPairMigrationSheet : Sheet {
+
+    override func populateContentView() {
+        // Set up image view
+        let imageView = UIImageView(image: #imageLiteral(resourceName: "Sun"))
+        // Set up title label
+        let titleLabel = UILabel()
+        titleLabel.textColor = Colors.text
+        titleLabel.font = .boldSystemFont(ofSize: isIPhone5OrSmaller ? Values.largeFontSize : Values.veryLargeFontSize)
+        titleLabel.text = "Session IDs Just Got Better"
+        titleLabel.numberOfLines = 0
+        titleLabel.lineBreakMode = .byWordWrapping
+        // Set up top stack view
+        let topStackView = UIStackView(arrangedSubviews: [ imageView, titleLabel ])
+        topStackView.axis = .vertical
+        topStackView.spacing = Values.largeSpacing
+        topStackView.alignment = .center
+        // Set up explanation label
+        let explanationLabel = UILabel()
+        explanationLabel.textColor = Colors.text
+        explanationLabel.font = .systemFont(ofSize: Values.smallFontSize)
+        explanationLabel.textAlignment = .center
+        explanationLabel.text = """
+        We upgraded the way Session IDs work. They're now even more secure bla bla bla.
+
+        Migrate now to ensure your account is as secure as possible.
+        """
+        explanationLabel.numberOfLines = 0
+        explanationLabel.lineBreakMode = .byWordWrapping
+        // Set up OK button
+        let okButton = Button(style: .prominentOutline, size: .large)
+        okButton.set(.width, to: 240)
+        okButton.setTitle(NSLocalizedString("OK", comment: ""), for: UIControl.State.normal)
+        okButton.addTarget(self, action: #selector(close), for: UIControl.Event.touchUpInside)
+        // Set up main stack view
+        let stackView = UIStackView(arrangedSubviews: [ topStackView, explanationLabel, okButton ])
+        stackView.axis = .vertical
+        stackView.spacing = Values.veryLargeSpacing
+        stackView.alignment = .center
+        // Set up constraints
+        contentView.addSubview(stackView)
+        stackView.pin(.leading, to: .leading, of: contentView, withInset: Values.veryLargeSpacing)
+        stackView.pin(.top, to: .top, of: contentView, withInset: Values.largeSpacing)
+        contentView.pin(.trailing, to: .trailing, of: stackView, withInset: Values.veryLargeSpacing)
+        contentView.pin(.bottom, to: .bottom, of: stackView, withInset: Values.veryLargeSpacing + overshoot)
+    }
+}
diff --git a/SessionUtilitiesKit/LKUserDefaults.swift b/SessionUtilitiesKit/LKUserDefaults.swift
index 077c7c2a9..1286814ab 100644
--- a/SessionUtilitiesKit/LKUserDefaults.swift
+++ b/SessionUtilitiesKit/LKUserDefaults.swift
@@ -11,6 +11,7 @@ public enum LKUserDefaults {
 
     public enum Date : Swift.String {
         case lastProfilePictureUpload
+        case lastKeyPairMigrationNudge
     }
 
     public enum Double : Swift.String {
diff --git a/Signal.xcodeproj/project.pbxproj b/Signal.xcodeproj/project.pbxproj
index dc7d26319..d9f81cbd3 100644
--- a/Signal.xcodeproj/project.pbxproj
+++ b/Signal.xcodeproj/project.pbxproj
@@ -236,6 +236,7 @@
 		B82B408E239DC00D00A248E7 /* DisplayNameVC.swift in Sources */ = {isa = PBXBuildFile; fileRef = B82B408D239DC00D00A248E7 /* DisplayNameVC.swift */; };
 		B82B4090239DD75000A248E7 /* RestoreVC.swift in Sources */ = {isa = PBXBuildFile; fileRef = B82B408F239DD75000A248E7 /* RestoreVC.swift */; };
 		B82B4094239DF15900A248E7 /* ConversationTitleView.swift in Sources */ = {isa = PBXBuildFile; fileRef = B82B4093239DF15900A248E7 /* ConversationTitleView.swift */; };
+		B83786802586D296003CE78E /* KeyPairMigrationSheet.swift in Sources */ = {isa = PBXBuildFile; fileRef = B837867F2586D296003CE78E /* KeyPairMigrationSheet.swift */; };
 		B83F2B88240CB75A000A54AB /* UIImage+Scaling.swift in Sources */ = {isa = PBXBuildFile; fileRef = B83F2B87240CB75A000A54AB /* UIImage+Scaling.swift */; };
 		B84664F5235022F30083A1CD /* MentionUtilities.swift in Sources */ = {isa = PBXBuildFile; fileRef = B84664F4235022F30083A1CD /* MentionUtilities.swift */; };
 		B85357BF23A1AE0800AAF6CD /* SeedReminderView.swift in Sources */ = {isa = PBXBuildFile; fileRef = B85357BE23A1AE0800AAF6CD /* SeedReminderView.swift */; };
@@ -1362,6 +1363,7 @@
 		B82B408D239DC00D00A248E7 /* DisplayNameVC.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DisplayNameVC.swift; sourceTree = "<group>"; };
 		B82B408F239DD75000A248E7 /* RestoreVC.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RestoreVC.swift; sourceTree = "<group>"; };
 		B82B4093239DF15900A248E7 /* ConversationTitleView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConversationTitleView.swift; sourceTree = "<group>"; };
+		B837867F2586D296003CE78E /* KeyPairMigrationSheet.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KeyPairMigrationSheet.swift; sourceTree = "<group>"; };
 		B83F2B85240C7B8F000A54AB /* NewConversationButtonSet.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NewConversationButtonSet.swift; sourceTree = "<group>"; };
 		B83F2B87240CB75A000A54AB /* UIImage+Scaling.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIImage+Scaling.swift"; sourceTree = "<group>"; };
 		B84072952565E9F50037CB17 /* TSOutgoingMessage+Conversion.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "TSOutgoingMessage+Conversion.swift"; sourceTree = "<group>"; };
@@ -2620,6 +2622,7 @@
 				B88847BB23E10BC6009836D2 /* GroupMembersVC.swift */,
 				B8BB82A4238F627000BA5194 /* HomeVC.swift */,
 				B8CCF63E23975CFB0091D419 /* JoinPublicChatVC.swift */,
+				B837867F2586D296003CE78E /* KeyPairMigrationSheet.swift */,
 				B82B40872399EB0E00A248E7 /* LandingVC.swift */,
 				C329FEEB24F7277900B1C64C /* LightModeSheet.swift */,
 				B86BD08323399ACF000F5AE3 /* Modal.swift */,
@@ -5532,6 +5535,7 @@
 				340FC8AC204DAC8D007AEB0F /* PrivacySettingsTableViewController.m in Sources */,
 				B88847BC23E10BC6009836D2 /* GroupMembersVC.swift in Sources */,
 				B85357BF23A1AE0800AAF6CD /* SeedReminderView.swift in Sources */,
+				B83786802586D296003CE78E /* KeyPairMigrationSheet.swift in Sources */,
 				C35E8AAE2485E51D00ACB629 /* IP2Country.swift in Sources */,
 				340FC8AE204DAC8D007AEB0F /* OWSSoundSettingsViewController.m in Sources */,
 				340FC8B0204DAC8D007AEB0F /* AddToBlockListViewController.m in Sources */,