diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 5a6d70f..e2e3155 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -4,7 +4,7 @@ ci:
 
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.4.0
+    rev: v4.5.0
     hooks:
       - id: trailing-whitespace
       - id: end-of-file-fixer
@@ -14,7 +14,7 @@ repos:
       - id: check-yaml
 
   - repo: https://github.com/psf/black
-    rev: 23.9.1
+    rev: 23.12.1
     hooks:
       - id: black-jupyter
 
@@ -27,17 +27,17 @@ repos:
     hooks:
       - id: seed-isort-config
   - repo: https://github.com/PyCQA/isort
-    rev: 5.12.0
+    rev: 5.13.2
     hooks:
       - id: isort
 
   - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: v3.0.3
+    rev: v4.0.0-alpha.8
     hooks:
       - id: prettier
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.5.1
+    rev: v1.8.0
     hooks:
       - id: mypy
         additional_dependencies: [
diff --git a/xbatcher/testing.py b/xbatcher/testing.py
index 36de58f..dd2139d 100644
--- a/xbatcher/testing.py
+++ b/xbatcher/testing.py
@@ -183,7 +183,7 @@ def validate_batch_dimensions(
 
     # Check the names and lengths of the dimensions are equal
     TestCase().assertDictEqual(
-        expected_dims, batch.sizes.mapping, msg="Dimension names and/or lengths differ"
+        expected_dims, dict(batch.sizes), msg="Dimension names and/or lengths differ"
     )
     # Check the dimension order is equal
     for var in batch.data_vars: