diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 59110ee..f57a692 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -5,7 +5,7 @@
 # * Run "pre-commit install".
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.6.0
+    rev: v6.0.0
     hooks:
       - id: check-toml
       - id: check-yaml
@@ -16,14 +16,14 @@ repos:
       - id: trailing-whitespace
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.6.7
+    rev: v0.14.10
     hooks:
       - id: ruff
         args: [--fix, --show-fixes]
       - id: ruff-format
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.11.2
+    rev: v1.19.1
     hooks:
       - id: mypy
         additional_dependencies:
diff --git a/cbor2/_encoder.py b/cbor2/_encoder.py
index bdd92dd..b3e0983 100644
--- a/cbor2/_encoder.py
+++ b/cbor2/_encoder.py
@@ -557,7 +557,7 @@ def encode_datetime(self, value: datetime) -> None:
                 value = value.replace(tzinfo=self._timezone)
             else:
                 raise CBOREncodeValueError(
-                    f"naive datetime {value!r} encountered and no default timezone " "has been set"
+                    f"naive datetime {value!r} encountered and no default timezone has been set"
                 )
 
         if self.datetime_as_timestamp:
diff --git a/tests/test_encoder.py b/tests/test_encoder.py
index e6adc08..8ccb82f 100644
--- a/tests/test_encoder.py
+++ b/tests/test_encoder.py
@@ -669,16 +669,7 @@ def test_encode_stringrefs_array(impl):
 def test_encode_stringrefs_dict(impl):
     value = {"aaaa": "mmmm", "bbbb": "bbbb", "cccc": "aaaa", "mmmm": "aaaa"}
     expected = unhexlify(
-        "d90100"
-        "a4"
-        "6461616161"
-        "646d6d6d6d"
-        "6462626262"
-        "d81902"
-        "6463636363"
-        "d81900"
-        "d81901"
-        "d81900"
+        "d90100a46461616161646d6d6d6d6462626262d819026463636363d81900d81901d81900"
     )
     assert impl.dumps(value, string_referencing=True, canonical=True) == expected