diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index c4e7f89..7088015 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -20,7 +20,7 @@ repos:
       - id: trailing-whitespace
 
   - repo: https://github.com/python-jsonschema/check-jsonschema
-    rev: 0.23.2
+    rev: 0.23.3
     hooks:
       - id: check-github-workflows
 
@@ -30,12 +30,12 @@ repos:
       - id: mdformat
 
   - repo: https://github.com/psf/black
-    rev: 23.3.0
+    rev: 23.7.0
     hooks:
       - id: black
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.0.276
+    rev: v0.0.281
     hooks:
       - id: ruff
         args: ["--fix"]
diff --git a/nbformat/validator.py b/nbformat/validator.py
index f72fbbc..32ba948 100644
--- a/nbformat/validator.py
+++ b/nbformat/validator.py
@@ -474,10 +474,9 @@ def validate(  # noqa
             version = nbdict_version
         if version_minor is None:
             version_minor = nbdict_version_minor
-    else:
-        # if ref is specified, and we don't have a version number, assume we're validating against 1.0
-        if version is None:  # noqa
-            version, version_minor = 1, 0
+    # if ref is specified, and we don't have a version number, assume we're validating against 1.0
+    elif version is None:
+        version, version_minor = 1, 0
 
     if ref is None:
         assert isinstance(version, int)  # noqa
diff --git a/pyproject.toml b/pyproject.toml
index ac5c014..5de7a3f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -86,7 +86,7 @@ dependencies = ["mypy>=0.990"]
 test = "mypy --install-types --non-interactive {args:nbformat tests}"
 
 [tool.hatch.envs.lint]
-dependencies = ["black[jupyter]==23.3.0", "mdformat>0.7", "ruff==0.0.276"]
+dependencies = ["black[jupyter]==23.3.0", "mdformat>0.7", "ruff==0.0.281"]
 detached = true
 [tool.hatch.envs.lint.scripts]
 style = [
diff --git a/tests/v4/test_json.py b/tests/v4/test_json.py
index 21c7f9e..4aed699 100644
--- a/tests/v4/test_json.py
+++ b/tests/v4/test_json.py
@@ -115,9 +115,7 @@ def test_base_version_matches_latest(self):
             with open(
                 os.path.join(
                     BASE_PATH,
-                    "nbformat.v{major}.{minor}.schema.json".format(
-                        major=nbformat, minor=nbformat_minor
-                    ),
+                    f"nbformat.v{nbformat}.{nbformat_minor}.schema.json",
                 ),
                 encoding='utf-8',
             ) as schema_file:  # noqa