diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 64373ed..e8ff630 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -25,12 +25,12 @@ repos:
   hooks:
     - id: remove-crlf
 - repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: v0.7.1
+  rev: v0.9.3
   hooks:
     - id: ruff-format
     - id: ruff
       args: ["--fix", "--show-fixes"]
 - repo: https://github.com/python-jsonschema/check-jsonschema
-  rev: 0.29.4
+  rev: 0.31.0
   hooks:
     - id: check-github-workflows
diff --git a/src/tinydft/atom.py b/src/tinydft/atom.py
index 0139472..1488a02 100644
--- a/src/tinydft/atom.py
+++ b/src/tinydft/atom.py
@@ -60,13 +60,13 @@ def interpret_econf(econf: str) -> list[np.ndarray]:
         occup = float(key[2:])
         if occup <= 0:
             raise ValueError(
-                "Occuptions in the electronic configuration must " "be strictly positive."
+                "Occuptions in the electronic configuration must be strictly positive."
             )
         priqn = int(key[0])
         angqn = char2angqn(key[1])
         if occup > 2 * (2 * angqn + 1):
             raise ValueError(
-                "Occuptions in the electronic configuration must " "not exceed 2 * (2 * angqn + 1)."
+                "Occuptions in the electronic configuration must not exceed 2 * (2 * angqn + 1)."
             )
         # Add more angular momenta if needed.
         while len(occups) < angqn + 1:
diff --git a/tests/test_tinydft.py b/tests/test_tinydft.py
index 8b2629b..a2ffccf 100644
--- a/tests/test_tinydft.py
+++ b/tests/test_tinydft.py
@@ -87,7 +87,7 @@ def test_klechkowski():
     assert klechkowski(10) == "1s2 2s2 2p6"
     assert klechkowski(23) == "1s2 2s2 2p6 3s2 3p6 4s2 3d3"
     assert klechkowski(118) == (
-        "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 " "6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6"
+        "1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6"
     )