diff --git a/pyproject.toml b/pyproject.toml
index 39255a3..7b69390 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ dependencies = [
 
 [project.optional-dependencies] # Optional
 dev = [
-  "black~=25.1",
+  "black~=26.1",
   "pytest~=9.0",
   "pytest-cov~=7.0",
 ]
diff --git a/sample_registry/db.py b/sample_registry/db.py
index 9b9a911..6322348 100644
--- a/sample_registry/db.py
+++ b/sample_registry/db.py
@@ -13,7 +13,6 @@
     StandardHostSpecies,
 )
 
-
 STANDARD_TAGS = {
     "SampleType": "sample_type",
     "SubjectID": "subject_id",
diff --git a/sample_registry/register.py b/sample_registry/register.py
index 7f0d8a1..1530470 100644
--- a/sample_registry/register.py
+++ b/sample_registry/register.py
@@ -9,7 +9,6 @@
 from sample_registry.registrar import SampleRegistry
 from seqBackupLib.illumina import IlluminaFastq
 
-
 SAMPLES_DESC = """\
 Add new samples to the registry, with annotations.
 """
diff --git a/tests/test_mapping.py b/tests/test_mapping.py
index c5fc035..33c3c8f 100644
--- a/tests/test_mapping.py
+++ b/tests/test_mapping.py
@@ -1,7 +1,6 @@
 import io
 from sample_registry.mapping import SampleTable
 
-
 NORMAL_TSV = """\
 SampleID	BarcodeSequence	HostSpecies	SubjectID
 S1	GCCT	Human	Hu23
diff --git a/tests/test_register.py b/tests/test_register.py
index 7d4d574..12ccfbf 100644
--- a/tests/test_register.py
+++ b/tests/test_register.py
@@ -25,7 +25,6 @@
     register_host_species,
 )
 
-
 samples = [
     {
         "SampleID": "abc123",