diff --git a/checks/lib/container-driver/pyproject.toml b/checks/lib/container-driver/pyproject.toml
index 8bfaa32f..088e026f 100644
--- a/checks/lib/container-driver/pyproject.toml
+++ b/checks/lib/container-driver/pyproject.toml
@@ -21,11 +21,6 @@ line-length = 88
 select = ["E", "F", "I", "U", "N"]
 ignore = ["E501"]
 
-[tool.black]
-line-length = 88
-target-version = ['py39']
-include = '\.pyi?$'
-
 [tool.mypy]
 python_version = "3.10"
 warn_redundant_casts = true
diff --git a/formatter.nix b/formatter.nix
index ee1c7510..89a68165 100644
--- a/formatter.nix
+++ b/formatter.nix
@@ -46,7 +46,7 @@
         "-eucx"
         ''
           ${lib.getExe pkgs.ruff} --fix "$@"
-          ${lib.getExe pkgs.black} "$@"
+          ${lib.getExe pkgs.ruff} format "$@"
         ''
         "--" # this argument is ignored by bash
       ];
diff --git a/pkgs/clan-cli/clan_cli/vms/create.py b/pkgs/clan-cli/clan_cli/vms/create.py
index 906b5f62..9417eaa5 100644
--- a/pkgs/clan-cli/clan_cli/vms/create.py
+++ b/pkgs/clan-cli/clan_cli/vms/create.py
@@ -153,27 +153,44 @@ class BuildVmTask(BaseTask):
                 "console=tty0",
             ]
             qemu_command = [
-                # fmt: off
                 "qemu-kvm",
-                "-name", machine,
-                "-m", f'{vm_config["memorySize"]}M',
-                "-smp", str(vm_config["cores"]),
-                "-device", "virtio-rng-pci",
-                "-net", "nic,netdev=user.0,model=virtio", "-netdev", "user,id=user.0",
-                "-virtfs", "local,path=/nix/store,security_model=none,mount_tag=nix-store",
-                "-virtfs", f"local,path={xchg_dir},security_model=none,mount_tag=shared",
-                "-virtfs", f"local,path={xchg_dir},security_model=none,mount_tag=xchg",
-                "-virtfs", f"local,path={secrets_dir},security_model=none,mount_tag=secrets",
-                "-drive", f'cache=writeback,file={disk_img},format=raw,id=drive1,if=none,index=1,werror=report',
-                "-device", "virtio-blk-pci,bootindex=1,drive=drive1,serial=root",
-                "-device", "virtio-keyboard",
-                "-vga", "virtio",
+                "-name",
+                machine,
+                "-m",
+                f'{vm_config["memorySize"]}M',
+                "-smp",
+                str(vm_config["cores"]),
+                "-device",
+                "virtio-rng-pci",
+                "-net",
+                "nic,netdev=user.0,model=virtio",
+                "-netdev",
+                "user,id=user.0",
+                "-virtfs",
+                "local,path=/nix/store,security_model=none,mount_tag=nix-store",
+                "-virtfs",
+                f"local,path={xchg_dir},security_model=none,mount_tag=shared",
+                "-virtfs",
+                f"local,path={xchg_dir},security_model=none,mount_tag=xchg",
+                "-virtfs",
+                f"local,path={secrets_dir},security_model=none,mount_tag=secrets",
+                "-drive",
+                f"cache=writeback,file={disk_img},format=raw,id=drive1,if=none,index=1,werror=report",
+                "-device",
+                "virtio-blk-pci,bootindex=1,drive=drive1,serial=root",
+                "-device",
+                "virtio-keyboard",
+                "-vga",
+                "virtio",
                 "-usb",
-                "-device", "usb-tablet,bus=usb-bus.0",
-                "-kernel", f'{vm_config["toplevel"]}/kernel',
-                "-initrd", vm_config["initrd"],
-                "-append", " ".join(cmdline),
-                # fmt: on
+                "-device",
+                "usb-tablet,bus=usb-bus.0",
+                "-kernel",
+                f'{vm_config["toplevel"]}/kernel',
+                "-initrd",
+                vm_config["initrd"],
+                "-append",
+                " ".join(cmdline),
             ]
             if not self.vm.graphics:
                 qemu_command.append("-nographic")
diff --git a/pkgs/clan-cli/pyproject.toml b/pkgs/clan-cli/pyproject.toml
index 7e9fc09b..f402b713 100644
--- a/pkgs/clan-cli/pyproject.toml
+++ b/pkgs/clan-cli/pyproject.toml
@@ -58,25 +58,3 @@ line-length = 88
 
 select = [ "E", "F", "I",  "N"]
 ignore = [ "E501" ]
-
-[tool.black]
-line-length = 88
-target-version = [ "py310" ]
-include = "\\.pyi?$"
-exclude = '''
-/(
-    \.git
-  | \.hg
-  | \.mypy_cache
-  | \.tox
-  | \.venv
-  | _build
-  | buck-out
-  | build
-  | dist
-  # The following are specific to Black, you probably don't want those.
-  | blib2to3
-  | tests/data
-  | profiling
-)/
-'''
diff --git a/pyproject.toml b/pyproject.toml
index 4c77b284..277094c2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,6 @@
 [tool.mypy]
 python_version = "3.10"
+pretty = true
 warn_redundant_casts = true
 disallow_untyped_calls = true
 disallow_untyped_defs = true
@@ -11,25 +12,3 @@ line-length = 88
 
 select = [ "E", "F", "I", "U", "N"]
 ignore = [ "E501" ]
-
-[tool.black]
-line-length = 88
-target-version = [ "py310" ]
-include = "\\.pyi?$"
-exclude = '''
-/(
-    \.git
-  | \.hg
-  | \.mypy_cache
-  | \.tox
-  | \.venv
-  | _build
-  | buck-out
-  | build
-  | dist
-  # The following are specific to Black, you probably don't want those.
-  | blib2to3
-  | tests/data
-  | profiling
-)/
-'''