diff --git a/binder/postBuild b/binder/postBuild
index 0f91e54dc..3d8b957d0 100755
--- a/binder/postBuild
+++ b/binder/postBuild
@@ -18,10 +18,11 @@
 # jupyter nbextensions_configurator enable --user
 # jupyter nbextension list
 
-# Install and enable Jupyter lab extensions
+# Install and set up Jupyter lab extensions
 echo postBuild: Installing Jupyter Lab extensions...
 pip install jupyterlab-markup  # Mermaid in Jupyter Lab
 pip install jupyterlab-cell-flash
+jupyter labextension disable "@jupyterlab/apputils-extension:announcements"
 jupyter lab build
 
 # Install grcov
diff --git a/binder/postBuild.template b/binder/postBuild.template
index b2ca2948e..531252fde 100755
--- a/binder/postBuild.template
+++ b/binder/postBuild.template
@@ -18,10 +18,11 @@
 # jupyter nbextensions_configurator enable --user
 # jupyter nbextension list
 
-# Install and enable Jupyter lab extensions
+# Install and set up Jupyter lab extensions
 echo postBuild: Installing Jupyter Lab extensions...
 pip install jupyterlab-markup  # Mermaid in Jupyter Lab
 pip install jupyterlab-cell-flash
+jupyter labextension disable "@jupyterlab/apputils-extension:announcements"
 jupyter lab build
 
 # Install grcov