diff --git a/tools/azure_dependencies.sh b/tools/azure_dependencies.sh
index e98a9c12da6..a7211f0195b 100755
--- a/tools/azure_dependencies.sh
+++ b/tools/azure_dependencies.sh
@@ -10,7 +10,9 @@ if [ "${TEST_MODE}" == "pip" ]; then
 elif [ "${TEST_MODE}" == "pip-pre" ]; then
 	python -m pip install --progress-bar off --upgrade pip setuptools wheel
 	python -m pip install --progress-bar off --upgrade --pre --only-binary ":all:" python-dateutil pytz joblib threadpoolctl six cycler kiwisolver pyparsing patsy
-	python -m pip install --progress-bar off --upgrade --pre --only-binary ":all:" --no-deps --extra-index-url https://www.riverbankcomputing.com/pypi/simple PyQt6 PyQt6-sip PyQt6-Qt6
+	# XXX: the wheels for PyQt6-sip 13.4 are not available yet from https://www.riverbankcomputing.com/pypi/simple
+	# python -m pip install --progress-bar off --upgrade --pre --only-binary ":all:" --no-deps --extra-index-url https://www.riverbankcomputing.com/pypi/simple PyQt6 PyQt6-sip PyQt6-Qt6
+	python -m pip install --progress-bar off --upgrade --only-binary ":all:" PyQt6 PyQt6-sip PyQt6-Qt6
 	# SciPy Windows build is missing from conda nightly builds
 	python -m pip install --progress-bar off --upgrade --pre --only-binary ":all:" --no-deps -i "https://pypi.anaconda.org/scipy-wheels-nightly/simple" numpy
 	python -m pip install --progress-bar off --upgrade --pre --only-binary ":all:" --no-deps scipy
diff --git a/tools/github_actions_dependencies.sh b/tools/github_actions_dependencies.sh
index f832065833c..836dbe83c03 100755
--- a/tools/github_actions_dependencies.sh
+++ b/tools/github_actions_dependencies.sh
@@ -15,7 +15,9 @@ else
 	# https://pip.pypa.io/en/latest/user_guide/#possible-ways-to-reduce-backtracking-occurring
 	pip install $STD_ARGS --pre --only-binary ":all:" python-dateutil pytz joblib threadpoolctl six
 	echo "PyQt6"
-	pip install $STD_ARGS --pre --only-binary ":all:" --no-deps --extra-index-url https://www.riverbankcomputing.com/pypi/simple PyQt6 PyQt6-sip PyQt6-Qt6
+	# XXX: the wheels for PyQt6-sip 13.4 are not available yet from https://www.riverbankcomputing.com/pypi/simple
+	# pip install $STD_ARGS --pre --only-binary ":all:" --no-deps --extra-index-url https://www.riverbankcomputing.com/pypi/simple PyQt6 PyQt6-sip PyQt6-Qt6
+	pip install $STD_ARGS --only-binary ":all:" PyQt6 PyQt6-sip PyQt6-Qt6
 	echo "NumPy/SciPy/pandas etc."
 	pip install $STD_ARGS --pre --only-binary ":all:" --no-deps  --default-timeout=60 -i "https://pypi.anaconda.org/scipy-wheels-nightly/simple" numpy scipy pandas scikit-learn statsmodels dipy
 	echo "H5py, pillow, matplotlib"