diff --git a/doc/doc_requirements.txt b/doc/doc_requirements.txt
index 6c1da952b7820397cacacfb0b98717529e36e3ec..9284ebc8b4170f0ea4d859fd28fc45e3675086e1 100644
--- a/doc/doc_requirements.txt
+++ b/doc/doc_requirements.txt
@@ -1,5 +1,5 @@
 
-sphinx==8.0.2
+sphinx==8.1.3
 
 # A streamlined version of devmode_requirements.txt for doc building
 -e ./tools/exekall
diff --git a/setup.py b/setup.py
index 4ee661f2cdfca1733eafbb603f6a02318f26dec6..bc67560cec3352efe2c035d885d10585d892dca6 100755
--- a/setup.py
+++ b/setup.py
@@ -91,7 +91,9 @@ extras_require={
 extras_require["doc"] = [
     # Force ReadTheDocs to use a recent version, rather than the defaults used
     # for old projects.
-    "sphinx > 2",
+    # Add higher bound until this nbsphinx issue is resolved:
+    # https://github.com/spatialaudio/nbsphinx/issues/825
+    "sphinx > 2, <8.2.0",
     "pydata-sphinx-theme",
     "sphinxcontrib-plantuml",
     "nbsphinx",