diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index b6c086b..073dbf1 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -38,7 +38,7 @@ repos:
     hooks:
       - id: taplo-format
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.7.1
+    rev: v0.7.3
     hooks:
       - id: ruff
         types_or: [python, jupyter]
@@ -53,6 +53,6 @@ repos:
           - tomli
 
   - repo: https://github.com/kynan/nbstripout
-    rev: '0.7.1'
+    rev: '0.8.0'
     hooks:
       - id: nbstripout
diff --git a/ipylab/log.py b/ipylab/log.py
index 88eb205..942291c 100644
--- a/ipylab/log.py
+++ b/ipylab/log.py
@@ -79,7 +79,7 @@ class OutputError(OutputBase):
     output_type: Literal["error"]
     ename: str
     evalue: str
-    traceback: list[str]
+    traceback: list[str] | None
 
 
 OutputTypes = OutputDisplayData | OutputStream | OutputError