diff --git a/CHANGES.rst b/CHANGES.rst
index 865e60c..a6297df 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -7,6 +7,8 @@ Unreleased
 ==========
 
 - Dependencies: Unblock newer versions of Sphinx
+- Dependencies: Updated to ``sphinx-autobuild==2025.8.25``
+- Enabled parallel builds by updating theme and using ``--jobs auto``
 
 
 2.1.2 - 2024/02/28
diff --git a/common-build/requirements.txt b/common-build/requirements.txt
index 3e970fd..a1228b4 100644
--- a/common-build/requirements.txt
+++ b/common-build/requirements.txt
@@ -2,9 +2,7 @@
 ###############################################################################
 
 docutils>=0.14
-
-# Most recent 2024.2.4 has errors on live reloading.
-sphinx-autobuild==2021.3.14
+sphinx-autobuild==2025.8.25
 
 # These versions should match the Read The Docs environment (please update if
 # you notice this is not the case)
diff --git a/common-build/rules.mk b/common-build/rules.mk
index 765338b..df8bc81 100644
--- a/common-build/rules.mk
+++ b/common-build/rules.mk
@@ -50,7 +50,7 @@ PYTHON          = python3
 PIP             = $(PYTHON) -m pip
 SPHINXBUILD     = $(ENV_DIR)/bin/sphinx-build
 SPHINXAUTOBUILD = $(ENV_DIR)/bin/sphinx-autobuild
-AUTOBUILD_OPTS  = --watch $(TOP_DIR)/src --re-ignore '^(?!.+\.(?:rst|md|mmd|html|css|js|py|conf)$$)' --open-browser --delay 0
+AUTOBUILD_OPTS  = --watch $(TOP_DIR) --re-ignore '^(?!.+\.(?:rst|md|mmd|html|css|js|py|conf)$$)' --open-browser --delay 0 --jobs auto
 BUILD_DIR       = $(LOCAL_DIR)/.build
 SPHINX_ARGS     = . $(BUILD_DIR)
 SPHINX_OPTS     = -W -n
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 55e2a85..a17147c 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,2 +1,2 @@
 sphinx>=3,<9
-crate-docs-theme
+crate-docs-theme>=0.42.0