diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index bb2ad36d..04804108 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -21,3 +21,6 @@ updates:
     ignore:
       - dependency-name: "jupyter-book"
         versions: [">=2.0"]
+      - dependency-name: "python"
+        # Python version should be constrained by the anaconda distribution version
+        versions: [">0"]
diff --git a/lectures/_admonition/gpu.md b/lectures/_admonition/gpu.md
index f3007798..0bdab1de 100644
--- a/lectures/_admonition/gpu.md
+++ b/lectures/_admonition/gpu.md
@@ -1,7 +1,7 @@
 ```{admonition} GPU
 :class: warning
 
-This lecture was built using a machine with access to a GPU.
+This lecture was built using a machine with access to a GPU --- although it will also run without one.
 
 [Google Colab](https://colab.research.google.com/) has a free tier with GPUs
 that you can access as follows: