Ensure kernel is ready before sending execute_request messages

nbsite/nbbuild.py

@@ -98,6 +98,9 @@ def kc(self):
     def kc(self, v):
         self._kc = v
         if v is not None and self._ipython_startup is not None:
+            # Ensure kernel is running and ready to receive execute_request messages.
+            # This is important for ipykernel >= 7
+            self._kc.kernel_info()
             self._kc.execute(
                 self._ipython_startup,
                 silent=False,

pixi.toml

@@ -43,7 +43,7 @@ no-default-feature = true
 
 [feature.required.dependencies]
 beautifulsoup4 = "*"
-ipykernel = "<7.0.0"  # Temp pin
+ipykernel = "*"
 jinja2 = "*"
 jupyter_client = "*"
 myst-nb = ">=1.1"

pyproject.toml

@@ -49,7 +49,6 @@ dependencies = [
     'sphinxext-rediraffe',
     'packaging',
     'requests',
-    'ipykernel <7.0',  # Temp. dependency
 ]
 
 [project.scripts]