diff --git a/CHANGES b/CHANGES
index 3e3a1c58882..4cd8ac3d335 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,10 +1,16 @@
 Release 7.2.3 (in development)
 ==============================
 
+Dependencies
+------------
+
+* #11576: Require sphinxcontrib-serializinghtml 1.1.9.
+
 Bugs fixed
 ----------
 
 * Fix regression in ``autodoc.Documenter.parse_name()``.
+* Fix regression in JSON serialisation.
 
 Release 7.2.2 (released Aug 17, 2023)
 =====================================
diff --git a/pyproject.toml b/pyproject.toml
index 4cae7c1dd86..0a9bc9e62f0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -59,7 +59,7 @@ dependencies = [
     "sphinxcontrib-devhelp",
     "sphinxcontrib-jsmath",
     "sphinxcontrib-htmlhelp>=2.0.0",
-    "sphinxcontrib-serializinghtml>=1.1.5",
+    "sphinxcontrib-serializinghtml>=1.1.9",
     "sphinxcontrib-qthelp",
     "Jinja2>=3.0",
     "Pygments>=2.14",