diff --git a/pydra/engine/helpers.py b/pydra/engine/helpers.py
index e5d185c9be..fc7867b8dd 100644
--- a/pydra/engine/helpers.py
+++ b/pydra/engine/helpers.py
@@ -244,8 +244,7 @@ def hash_function(obj):
     return sha256(str(obj).encode()).hexdigest()
 
 
-def hash_file(afile, chunk_len=8192, crypto=sha256,
-              raise_notfound=False):
+def hash_file(afile, chunk_len=8192, crypto=sha256, raise_notfound=False):
     """
     Computes hash of a file using 'crypto' module
     """
@@ -255,10 +254,10 @@ def hash_file(afile, chunk_len=8192, crypto=sha256,
         return None
 
     crypto_obj = crypto()
-    with open(afile, 'rb') as fp:
+    with open(afile, "rb") as fp:
         while True:
             data = fp.read(chunk_len)
             if not data:
                 break
             crypto_obj.update(data)
-    return crypto_obj.hexdigest()
\ No newline at end of file
+    return crypto_obj.hexdigest()
diff --git a/pydra/engine/specs.py b/pydra/engine/specs.py
index 3be288471a..52c4a81157 100644
--- a/pydra/engine/specs.py
+++ b/pydra/engine/specs.py
@@ -28,7 +28,9 @@ def hash(self):
         from .helpers import hash_function, hash_file
 
         inp_dict = {
-            field.name: hash_file(getattr(self, field.name)) if field.type == File else getattr(self, field.name)
+            field.name: hash_file(getattr(self, field.name))
+            if field.type == File
+            else getattr(self, field.name)
             for field in dc.fields(self)
             if field.name not in ["_graph_checksums"]
         }
diff --git a/pydra/engine/tests/test_helpers.py b/pydra/engine/tests/test_helpers.py
index 589022d8fd..a409ae51bf 100644
--- a/pydra/engine/tests/test_helpers.py
+++ b/pydra/engine/tests/test_helpers.py
@@ -43,6 +43,9 @@ def test_create_pyscript(tmpdir):
 
 def test_hash_file(tmpdir):
     outdir = Path(tmpdir)
-    with open(outdir / 'test.file', 'wt') as fp:
-        fp.write('test')
-    assert helpers.hash_file(outdir / 'test.file') == '9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08'
+    with open(outdir / "test.file", "wt") as fp:
+        fp.write("test")
+    assert (
+        helpers.hash_file(outdir / "test.file")
+        == "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08"
+    )
diff --git a/pydra/engine/tests/test_specs.py b/pydra/engine/tests/test_specs.py
index 4b5918d7f7..fd03d3fbba 100644
--- a/pydra/engine/tests/test_specs.py
+++ b/pydra/engine/tests/test_specs.py
@@ -152,19 +152,20 @@ def test_lazy_getvale():
 
 def test_file_hash(tmpdir):
     tmpdir.chdir()
-    outfile = 'test.file'
+    outfile = "test.file"
     fields = [("in_file", ty.Any)]
-    input_spec = SpecInfo(name="Inputs", fields=fields,
-                          bases=(BaseSpec,))
+    input_spec = SpecInfo(name="Inputs", fields=fields, bases=(BaseSpec,))
     inputs = make_klass(input_spec)
-    assert inputs(str(outfile)).hash == '1384a1eb11cd94a5b826a82b948313b9237a0956d406ccff59e79ec92b3c935f'
-    with open(outfile, 'wt') as fp:
-        fp.write('test')
+    assert (
+        inputs(str(outfile)).hash
+        == "1384a1eb11cd94a5b826a82b948313b9237a0956d406ccff59e79ec92b3c935f"
+    )
+    with open(outfile, "wt") as fp:
+        fp.write("test")
     fields = [("in_file", File)]
-    input_spec = SpecInfo(name="Inputs", fields=fields,
-                          bases=(BaseSpec,))
+    input_spec = SpecInfo(name="Inputs", fields=fields, bases=(BaseSpec,))
     inputs = make_klass(input_spec)
-    assert inputs(outfile).hash == '088625131e6718a00170ad445a9c295244dffd4e5d847c8ee4b1606d623dacb1'
-
-
-
+    assert (
+        inputs(outfile).hash
+        == "088625131e6718a00170ad445a9c295244dffd4e5d847c8ee4b1606d623dacb1"
+    )