diff --git a/.github/ISSUE_TEMPLATE/bug_report.md b/.github/ISSUE_TEMPLATE/bug_report.md
index 625e8dc..2251e74 100644
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -33,7 +33,7 @@ about: File a bug report to help us improve.
 
 <details><summary>Extension lists</summary>
 <pre>
-Paste the output from running `jupyter labextension list` and `jupyter serverextension list` from the command line here.
+Paste the output from running `jupyter labextension list` and `jupyter server extension list` from the command line here.
 You may want to sanitize the paths in the output.
 </pre>
 </details>
diff --git a/README.md b/README.md
index 80053df..d890a66 100644
--- a/README.md
+++ b/README.md
@@ -116,13 +116,13 @@ If you are seeing the frontend extension but it is not working, check that
 It should be listed when running:
 
 ```bash
-jupyter serverextension list
+jupyter server extension list
 ```
 
 If `jupyterlab_h5web` does not appear or is disabled, try to enable it:
 
 ```
-jupyter serverextension enable jupyterlab_h5web
+jupyter server extension enable jupyterlab_h5web
 ```
 
 ### Check the frontend extension