diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4432274e..43995822 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -34,11 +34,11 @@ jobs:
             pytest-options: '-m "cython"'
           # latest of sphinx 3.x series (released for Python 3.9)
           - python-version: '3.9'
-            pip-sphinx: '"sphinx<4" "jinja2<3.1" "sphinxcontrib-applehelp<1.0.8"'
+            pip-sphinx: '"sphinx<4" "jinja2<3.1" "sphinxcontrib-applehelp<1.0.8" "sphinxcontrib-devhelp<1.0.5" "sphinxcontrib-htmlhelp<2.0.4"'
             pytest-options: ''
           # latest of sphinx 4.x series (released for Python 3.10)
           - python-version: '3.10'
-            pip-sphinx: '"sphinx<5" "sphinxcontrib-applehelp<1.0.8"'
+            pip-sphinx: '"sphinx<5" "sphinxcontrib-applehelp<1.0.8" "sphinxcontrib-devhelp<1.0.5" "sphinxcontrib-htmlhelp<2.0.4"'
             pytest-options: ''
           # latest of sphinx 5.x series
           - python-version: '3.11'