diff --git a/.gitignore b/.gitignore
index 25641cefad..752f2ccb96 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,6 +24,9 @@ output/config.yaml
 *.csv
 *.spm
 
+# Notebook checkpoints
+notebooks/.ipynb_checkpoints/
+
 # Example Data
 !minicircle.spm
 
diff --git a/pyproject.toml b/pyproject.toml
index 8aa5e0b491..97195d58c2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -63,7 +63,7 @@ tests = [
   "pytest-github-actions-annotate-failures",
   "pytest-lazy-fixture",
   "pytest-mpl",
-  "pytest-regtest",
+  "pytest-regtest<2.0.0",
   "filetype",
 ]
 docs = [
@@ -237,6 +237,10 @@ lint.fixable = [
 ]
 lint.unfixable = []
 
+# Numpy2 deprecation checks
+lint.extend-select = ["NPY201"]
+preview = true
+
 [tool.ruff.lint.flake8-quotes]
 docstring-quotes = "double"