diff --git a/examples/README.md b/examples/README.md
index 690d275..87b8001 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -11,11 +11,11 @@ The conversion is done like the following automated by the
 [docs/source/render_examples.py](../docs/source/render_examples.py) script:
 ``` bash
 # Converting markdown with code sections to Jupyter Notebook and run it:
-notedown examples/soec_methane.md --to notebook --output docs/source/api/soec_methane.ipynb --run
+notedown examples/sofc_methane.md --to notebook --output docs/source/api/sofc_methane.ipynb --run
 
 # Converting the Jupyter Notebook to Markdown and a folder with image
 # files placed in docs/source/api/:
-jupyter nbconvert --to markdown docs/source/api/soec_methane.ipynb --output soec_methane.md
+jupyter nbconvert --to markdown docs/source/api/sofc_methane.ipynb --output sofc_methane.md
 ```
 
 A new example Markdown file can be created from a Jupyter Notebook running
diff --git a/pyproject.toml b/pyproject.toml
index 6424fa1..bede962 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,10 +50,10 @@ doc_build = [
   "myst-parser",
   "pandas",
   "matplotlib",
-  "ipykernel",
-  "jupyter",
-  "nbconvert",
-  "notedown"
+  "ipykernel==6.29",
+  "jupyter==1.1",
+  "nbconvert==7.16",
+  "notedown==1.5"
 ]
 
 [tool.mypy]