diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..206af2c
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,12 @@
+[tool.black]
+target-version = ['py37']
+
+[tool.isort]
+multi_line_output = 3
+include_trailing_comma = true
+force_grid_wrap = 0
+use_parentheses = true
+ensure_newline_before_comments = true
+line_length = 88
+force_sort_within_sections = true
+
diff --git a/revisions_sort.py b/revisions_sort.py
index 2eb647d..a4905eb 100755
--- a/revisions_sort.py
+++ b/revisions_sort.py
@@ -1,47 +1,47 @@
 #!/usr/bin/env python
 
+from datetime import datetime
 import gzip
 import sys
-from datetime import datetime
 
 from swh.model.hashutil import hash_to_bytes, hash_to_hex
 
 if __name__ == "__main__":
     if len(sys.argv) != 3:
         print("usage: revisions_sort <infile> <outfile>")
         exit(-1)
 
     infilename = sys.argv[1]
     outfilename = sys.argv[2]
 
     with gzip.open(infilename, "rt") as infile:
         revisions = []
         sort = False
         for idx, line in enumerate(infile.readlines(), start=1):
             if line.strip():
                 splitted = line.split(",")
                 revision = hash_to_bytes(splitted[0])
                 date = datetime.fromisoformat(splitted[1])
                 root = hash_to_bytes(splitted[2])
 
                 assert date is not None
 
                 if revisions:
                     last = revisions[-1]
                     if date < last[1]:
                         print("Out of order", last, f"({revision},{date},{root})")
                         sort = True
 
                 revisions.append((revision, date, root))
 
         if sort:
             revisions = sorted(revisions, key=lambda rev: rev[1])
 
             date = None
             with gzip.open(outfilename, "wt") as outfile:
                 for rev in revisions:
                     assert date == None or date <= rev[1]
                     date = rev[1]
                     outfile.write(
                         f"{hash_to_hex(rev[0])},{rev[1]},{hash_to_hex(rev[2])}\n"
                     )