diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e0afc5db..3383316b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -37,11 +37,7 @@ repos:
       - id: ruff
         args: ["--fix", "--show-fixes"]
         exclude: "scripts/strun"
-
-  - repo: https://github.com/psf/black-pre-commit-mirror
-    rev: 23.10.1
-    hooks:
-      - id: black
+      - id: ruff-format
 
   - repo: https://github.com/adamchainz/blacken-docs
     rev: 1.16.0
diff --git a/pyproject.toml b/pyproject.toml
index f2c47bb3..795cedbd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -82,6 +82,9 @@ testpaths = [
 filterwarnings = [
     "error::ResourceWarning",
 ]
+markers = [
+    "soctests",
+]
 
 [tool.ruff]
 src = [
@@ -133,6 +136,9 @@ extend-select = [
     'PERF',    # Perflint (performance linting)
     'RUF',     # ruff specific checks
 ]
+ignore = [
+    "ISC001",  # conflicts with ruff formatter
+]
 
 [tool.ruff.lint.extend-per-file-ignores]
 "tests/*.py" = ["S101", "S603", "S607", "INP001", "ARG001"]
diff --git a/src/stpipe/step.py b/src/stpipe/step.py
index 0718f51e..7ce9f7b3 100644
--- a/src/stpipe/step.py
+++ b/src/stpipe/step.py
@@ -189,7 +189,11 @@ def from_cmdline(args):
 
     @classmethod
     def _parse_class_and_name(
-        cls, config, parent=None, name=None, config_file=None  # noqa: ARG003
+        cls,
+        config,
+        parent=None,  # noqa: ARG003
+        name=None,
+        config_file=None,
     ):
         if "class" in config:
             step_class = utilities.import_class(