diff --git a/Makefile b/Makefile
index 9e1a751..48ab2e6 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ swift:
 
 .PHONY: run
 run: all
-	$(QEMU) -machine raspi3b -kernel $(IMG) -serial stdio -display none
+	$(QEMU) -machine raspi4b -kernel $(IMG) -serial stdio -display none
 
 .PHONY: clean
 clean:
diff --git a/Package.swift b/Package.swift
index 8667711..6f08085 100644
--- a/Package.swift
+++ b/Package.swift
@@ -23,7 +23,7 @@ let package = Package(
                 "Support",
             ],
             swiftSettings: swiftSettings + [
-                .define("RASPI3")
+                .define("RASPI4")
             ]
         ),
         .systemLibrary(name: "Volatile"),
diff --git a/README.md b/README.md
index b99e3f3..3f5649f 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ An operating system written in Swift.
   - Fedora: `sudo dnf install llvm`
   - Ubuntu: `sudo apt install llvm`
   - macOS: `brew install llvm` and add `/opt/homebrew/opt/llvm/bin` to your `$PATH`
-- QEMU
+- QEMU 9.0+
   - Arch Linux: `sudo pacman -S qemu-system-aarch64`
   - Fedora: `sudo dnf install qemu-system-aarch64-core`
   - Ubuntu: `sudo apt install qemu-system-arm`