diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 7df65c7..3b84a94 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -14,7 +14,7 @@ repos:
       files: requirements-dev.txt
 
 - repo: https://github.com/keewis/blackdoc
-  rev: v0.4.1
+  rev: v0.4.3
   hooks:
     - id: blackdoc
 
@@ -39,7 +39,7 @@ repos:
     - id: add-trailing-comma
 
 - repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: v0.12.11
+  rev: v0.13.3
   hooks:
     - id: ruff
       args: ["--fix", "--show-fixes"]
@@ -62,12 +62,12 @@ repos:
     - id: nb-strip-paths
 
 - repo: https://github.com/tox-dev/pyproject-fmt
-  rev: v2.6.0
+  rev: v2.7.0
   hooks:
     - id: pyproject-fmt
 
 - repo: https://github.com/woodruffw/zizmor-pre-commit
-  rev: v1.12.1
+  rev: v1.14.2
   hooks:
     - id: zizmor
 
diff --git a/ctd/read.py b/ctd/read.py
index 7d29a66..0e834a7 100644
--- a/ctd/read.py
+++ b/ctd/read.py
@@ -369,7 +369,7 @@ def from_edf(fname: str | Path) -> pd.DataFrame:  # noqa: C901, PLR0912
         else:
             header.append(line)
             if line.startswith("Field"):
-                col, unit = (ln.strip().casefold() for ln in line.split(":"))
+                _, unit = (ln.strip().casefold() for ln in line.split(":"))
                 names.append(unit.split()[0])
         if line == "// Data":
             skiprows = k + 1
diff --git a/tests/test_processing_real_data.py b/tests/test_processing_real_data.py
index 6930f75..db11abf 100644
--- a/tests/test_processing_real_data.py
+++ b/tests/test_processing_real_data.py
@@ -54,7 +54,7 @@ def test_press_check_real_data(spiked_ctd):
 
 def test_processing_chain_spiked_ctd(spiked_ctd):
     """Test all processing steps chained."""
-    down, up = spiked_ctd.remove_above_water().split()
+    down, _ = spiked_ctd.remove_above_water().split()
     temp = down["t090C"]  # despike is a series only method
     temp = (
         temp.despike()