diff --git a/Userland/Applications/Piano/Track.h b/Userland/Applications/Piano/Track.h
index 6c660e37fc..d6a2abfb1c 100644
--- a/Userland/Applications/Piano/Track.h
+++ b/Userland/Applications/Piano/Track.h
@@ -13,7 +13,7 @@
 #include <AK/SinglyLinkedList.h>
 #include <LibAudio/Buffer.h>
 
-typedef AK::SinglyLinkedListIterator<SinglyLinkedList<RollNote>, RollNote> RollIter;
+using RollIter = AK::SinglyLinkedListIterator<SinglyLinkedList<RollNote>, RollNote>;
 
 class Track {
     AK_MAKE_NONCOPYABLE(Track);
diff --git a/Userland/DevTools/HackStudio/Debugger/BreakpointCallback.h b/Userland/DevTools/HackStudio/Debugger/BreakpointCallback.h
index a1cbb8b055..45a3207c08 100644
--- a/Userland/DevTools/HackStudio/Debugger/BreakpointCallback.h
+++ b/Userland/DevTools/HackStudio/Debugger/BreakpointCallback.h
@@ -17,6 +17,5 @@ enum class BreakpointChange {
     Removed,
 };
 
-typedef Function<void(const String& file, size_t line, BreakpointChange)> BreakpointChangeCallback;
-
+using BreakpointChangeCallback = Function<void(const String& file, size_t line, BreakpointChange)>;
 }
diff --git a/Userland/DevTools/HackStudio/Git/GitFilesView.h b/Userland/DevTools/HackStudio/Git/GitFilesView.h
index 83df71e95b..0901e4787e 100644
--- a/Userland/DevTools/HackStudio/Git/GitFilesView.h
+++ b/Userland/DevTools/HackStudio/Git/GitFilesView.h
@@ -13,7 +13,7 @@
 namespace HackStudio {
 
 // A "GitFileAction" is either the staging or the unstaging of a file.
-typedef Function<void(const LexicalPath& file)> GitFileActionCallback;
+using GitFileActionCallback = Function<void(const LexicalPath& file)>;
 
 class GitFilesView : public GUI::ListView {
     C_OBJECT(GitFilesView)
diff --git a/Userland/DevTools/HackStudio/Git/GitWidget.h b/Userland/DevTools/HackStudio/Git/GitWidget.h
index 608acea3fc..7bb852022b 100644
--- a/Userland/DevTools/HackStudio/Git/GitWidget.h
+++ b/Userland/DevTools/HackStudio/Git/GitWidget.h
@@ -14,7 +14,7 @@
 
 namespace HackStudio {
 
-typedef Function<void(const String& original_content, const String& diff)> ViewDiffCallback;
+using ViewDiffCallback = Function<void(const String& original_content, const String& diff)>;
 
 class GitWidget final : public GUI::Widget {
     C_OBJECT(GitWidget)
diff --git a/Userland/DevTools/StateMachineGenerator/main.cpp b/Userland/DevTools/StateMachineGenerator/main.cpp
index c0a6321c1d..9e82e75399 100644
--- a/Userland/DevTools/StateMachineGenerator/main.cpp
+++ b/Userland/DevTools/StateMachineGenerator/main.cpp
@@ -332,7 +332,7 @@ public:
     generator.append(R"~~~(
     }; // end Action
 
-    typedef Function<void(Action, u8)> Handler;
+    using Handler = Function<void(Action, u8)>;
 
     @class_name@(Handler handler)
     : m_handler(move(handler))
diff --git a/Userland/Utilities/ntpquery.cpp b/Userland/Utilities/ntpquery.cpp
index c5abba8523..a4ead4e42b 100644
--- a/Userland/Utilities/ntpquery.cpp
+++ b/Userland/Utilities/ntpquery.cpp
@@ -25,7 +25,7 @@
 // An NtpTimestamp is a 64-bit integer that's a 32.32 binary-fixed point number.
 // The integral part in the upper 32 bits represents seconds since 1900-01-01.
 // The fractional part in the lower 32 bits stores fractional bits times 2 ** 32.
-typedef uint64_t NtpTimestamp;
+using NtpTimestamp = uint64_t;
 
 struct [[gnu::packed]] NtpPacket {
     uint8_t li_vn_mode;