diff --git a/ci/build.py b/ci/build.py
index c835595..588b594 100644
--- a/ci/build.py
+++ b/ci/build.py
@@ -29,7 +29,12 @@ ATTIC_TOKEN = os.environ["ATTIC_TOKEN"]
 print(f"=== Building flake-hub packages for {ARCH} ===")
 
 # Setup attic
-attic = capture("nix build --inputs-from . nixpkgs#attic-client --print-out-paths --no-link") + "/bin/attic"
+attic = (
+    capture(
+        "nix build --inputs-from . nixpkgs#attic-client --print-out-paths --no-link"
+    )
+    + "/bin/attic"
+)
 run(f"'{attic}' login ci {ATTIC_SERVER} '{ATTIC_TOKEN}'")
 
 # Packages per arch
@@ -40,7 +45,9 @@ if ARCH == "s390x-linux":
 print("Building packages...")
 for pkg in packages:
     print(f"--- {pkg} ---")
-    out = capture(f"nix build '.#packages.{ARCH}.{pkg}' --print-build-logs --print-out-paths --no-link")
+    out = capture(
+        f"nix build '.#packages.{ARCH}.{pkg}' --print-build-logs --print-out-paths --no-link"
+    )
     run(f"'{attic}' push {ATTIC_CACHE} {out}")
 
 print(f"Build completed for {ARCH}")