diff --git a/Userland/DevTools/HackStudio/LanguageClients/ServerConnections.h b/Userland/DevTools/HackStudio/LanguageClients/ServerConnections.h
index f702788dfa7..9f88ae8acc6 100644
--- a/Userland/DevTools/HackStudio/LanguageClients/ServerConnections.h
+++ b/Userland/DevTools/HackStudio/LanguageClients/ServerConnections.h
@@ -14,7 +14,7 @@
 
 #define LANGUAGE_CLIENT(language_name_, socket_name)                                           \
     namespace language_name_ {                                                                 \
-    class ServerConnection : public HackStudio::ServerConnection {                             \
+    class ServerConnection final : public HackStudio::ServerConnection {                       \
         C_OBJECT(ServerConnection)                                                             \
     public:                                                                                    \
         static const char* language_name() { return #language_name_; }                         \
diff --git a/Userland/DevTools/HackStudio/LanguageServers/ClientConnection.h b/Userland/DevTools/HackStudio/LanguageServers/ClientConnection.h
index de1f4398fc3..b227923dd38 100644
--- a/Userland/DevTools/HackStudio/LanguageServers/ClientConnection.h
+++ b/Userland/DevTools/HackStudio/LanguageServers/ClientConnection.h
@@ -18,8 +18,7 @@
 
 namespace LanguageServers {
 
-class ClientConnection
-    : public IPC::ClientConnection<LanguageClientEndpoint, LanguageServerEndpoint> {
+class ClientConnection : public IPC::ClientConnection<LanguageClientEndpoint, LanguageServerEndpoint> {
 public:
     explicit ClientConnection(NonnullRefPtr<Core::LocalSocket>, int client_id);
     ~ClientConnection() override;
diff --git a/Userland/Libraries/LibAudio/ClientConnection.h b/Userland/Libraries/LibAudio/ClientConnection.h
index 7fe5e58af7e..f9c0a1dca34 100644
--- a/Userland/Libraries/LibAudio/ClientConnection.h
+++ b/Userland/Libraries/LibAudio/ClientConnection.h
@@ -14,7 +14,8 @@ namespace Audio {
 
 class Buffer;
 
-class ClientConnection : public IPC::ServerConnection<AudioClientEndpoint, AudioServerEndpoint>
+class ClientConnection final
+    : public IPC::ServerConnection<AudioClientEndpoint, AudioServerEndpoint>
     , public AudioClientEndpoint {
     C_OBJECT(ClientConnection)
 public:
diff --git a/Userland/Libraries/LibDesktop/Launcher.cpp b/Userland/Libraries/LibDesktop/Launcher.cpp
index 3186cdb0133..3ab43c60205 100644
--- a/Userland/Libraries/LibDesktop/Launcher.cpp
+++ b/Userland/Libraries/LibDesktop/Launcher.cpp
@@ -34,7 +34,8 @@ auto Launcher::Details::from_details_str(const String& details_str) -> NonnullRe
     return details;
 }
 
-class LaunchServerConnection : public IPC::ServerConnection<LaunchClientEndpoint, LaunchServerEndpoint>
+class LaunchServerConnection final
+    : public IPC::ServerConnection<LaunchClientEndpoint, LaunchServerEndpoint>
     , public LaunchClientEndpoint {
     C_OBJECT(LaunchServerConnection)
 private:
diff --git a/Userland/Libraries/LibGUI/Clipboard.cpp b/Userland/Libraries/LibGUI/Clipboard.cpp
index 5b44a1cd330..7a15d72b771 100644
--- a/Userland/Libraries/LibGUI/Clipboard.cpp
+++ b/Userland/Libraries/LibGUI/Clipboard.cpp
@@ -12,7 +12,8 @@
 
 namespace GUI {
 
-class ClipboardServerConnection : public IPC::ServerConnection<ClipboardClientEndpoint, ClipboardServerEndpoint>
+class ClipboardServerConnection final
+    : public IPC::ServerConnection<ClipboardClientEndpoint, ClipboardServerEndpoint>
     , public ClipboardClientEndpoint {
     C_OBJECT(ClipboardServerConnection);
 
diff --git a/Userland/Libraries/LibGUI/Notification.cpp b/Userland/Libraries/LibGUI/Notification.cpp
index 445237768f7..1af051f23ec 100644
--- a/Userland/Libraries/LibGUI/Notification.cpp
+++ b/Userland/Libraries/LibGUI/Notification.cpp
@@ -11,7 +11,8 @@
 
 namespace GUI {
 
-class NotificationServerConnection : public IPC::ServerConnection<NotificationClientEndpoint, NotificationServerEndpoint>
+class NotificationServerConnection final
+    : public IPC::ServerConnection<NotificationClientEndpoint, NotificationServerEndpoint>
     , public NotificationClientEndpoint {
     C_OBJECT(NotificationServerConnection)
 
diff --git a/Userland/Libraries/LibGUI/WindowManagerServerConnection.h b/Userland/Libraries/LibGUI/WindowManagerServerConnection.h
index 8efd9225032..8898448c1c3 100644
--- a/Userland/Libraries/LibGUI/WindowManagerServerConnection.h
+++ b/Userland/Libraries/LibGUI/WindowManagerServerConnection.h
@@ -12,7 +12,7 @@
 
 namespace GUI {
 
-class WindowManagerServerConnection
+class WindowManagerServerConnection final
     : public IPC::ServerConnection<WindowManagerClientEndpoint, WindowManagerServerEndpoint>
     , public WindowManagerClientEndpoint {
     C_OBJECT(WindowManagerServerConnection)
diff --git a/Userland/Libraries/LibGUI/WindowServerConnection.h b/Userland/Libraries/LibGUI/WindowServerConnection.h
index d5aef15cc6e..ee1a032752e 100644
--- a/Userland/Libraries/LibGUI/WindowServerConnection.h
+++ b/Userland/Libraries/LibGUI/WindowServerConnection.h
@@ -12,7 +12,7 @@
 
 namespace GUI {
 
-class WindowServerConnection
+class WindowServerConnection final
     : public IPC::ServerConnection<WindowClientEndpoint, WindowServerEndpoint>
     , public WindowClientEndpoint {
     C_OBJECT(WindowServerConnection)
diff --git a/Userland/Libraries/LibProtocol/RequestClient.h b/Userland/Libraries/LibProtocol/RequestClient.h
index d9b31787a00..0bb02567ab0 100644
--- a/Userland/Libraries/LibProtocol/RequestClient.h
+++ b/Userland/Libraries/LibProtocol/RequestClient.h
@@ -15,7 +15,7 @@ namespace Protocol {
 
 class Request;
 
-class RequestClient
+class RequestClient final
     : public IPC::ServerConnection<RequestClientEndpoint, RequestServerEndpoint>
     , public RequestClientEndpoint {
     C_OBJECT(RequestClient);
diff --git a/Userland/Libraries/LibProtocol/WebSocketClient.h b/Userland/Libraries/LibProtocol/WebSocketClient.h
index ac6a2d0a981..c2f8a70ce6a 100644
--- a/Userland/Libraries/LibProtocol/WebSocketClient.h
+++ b/Userland/Libraries/LibProtocol/WebSocketClient.h
@@ -15,7 +15,7 @@ namespace Protocol {
 
 class WebSocket;
 
-class WebSocketClient
+class WebSocketClient final
     : public IPC::ServerConnection<WebSocketClientEndpoint, WebSocketServerEndpoint>
     , public WebSocketClientEndpoint {
     C_OBJECT(WebSocketClient);