diff --git a/pyproject.toml b/pyproject.toml
index 6146cd0ac..2384dcdc3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -48,7 +48,7 @@ dependencies = [
 
     # Visualization
     "matplotlib >= 3.5.2, < 4.0.0",
-    "plotly >= 5.15.0, < 6.0.0",
+    "plotly >=5.15.0, <6.4.0",
 ]
 
 [project.optional-dependencies]
@@ -77,6 +77,7 @@ full = [
 # Development tools and testing
 dev = [
     "pytest >= 7.0.0",
+    "nbformat>=4.2.0",  # Related to failing CI with Plotly>6
     "ruff >= 0.9.0",
     "pre-commit >= 4.0.0",
     "pyvis ==0.3.2",  # Visualizing FlowSystem