diff --git a/environment.yml b/environment.yml
index 9f1c4c00..8592a2cf 100644
--- a/environment.yml
+++ b/environment.yml
@@ -7,6 +7,7 @@ dependencies:
   - pip
   - pip:
     - jupyter-book==0.15.1
+    - docutils==0.17.1
     - quantecon-book-theme==0.5.3
     - sphinx-tojupyter==0.3.0
     - sphinxext-rediraffe==0.2.7
diff --git a/lectures/_config.yml b/lectures/_config.yml
index 0d33b9dc..91635fb2 100644
--- a/lectures/_config.yml
+++ b/lectures/_config.yml
@@ -17,6 +17,10 @@ latex:
 sphinx:
   extra_extensions: [sphinx_multitoc_numbering, sphinxext.rediraffe, sphinx_tojupyter, sphinx_exercise, sphinx_togglebutton]
   config:
+    # false-positive links
+    linkcheck_ignore: ['https://github.com/matplotlib/matplotlib/blob/v3.6.2/lib/matplotlib/axes/_axes.py#L1417-L1669',
+                       'https://ieeexplore.ieee.org/document/8757088',
+                       'https://www.sciencedirect.com/science/article/pii/S1477388021000177']
     html_favicon: _static/lectures-favicon.ico
     html_theme: quantecon_book_theme
     html_static_path: ['_static']