diff --git a/.github/workflows/ci_workflows.yml b/.github/workflows/ci_workflows.yml
index a14b13b0..655f176e 100644
--- a/.github/workflows/ci_workflows.yml
+++ b/.github/workflows/ci_workflows.yml
@@ -24,6 +24,7 @@ jobs:
     with:
       coverage: codecov
       display: true
+      # Linux PyQt 5.15 and 6.3 installations require apt-getting xcb and EGL deps
       libraries: |
         apt:
           - '^libxcb.*-dev'
@@ -43,6 +44,7 @@ jobs:
         - linux: py37-test-pyside513
         - linux: py38-test-pyside514
         - linux: py310-test-pyside515
+        - linux: py310-test-pyside63
 
         # Test a few configurations on MacOS X (ask for arm64 with py310; may not be available yet)
         - macos: py37-test-pyqt513
@@ -53,6 +55,7 @@ jobs:
           PLAT: arm64
 
         - macos: py39-test-pyside515
+        - macos: py310-test-pyside63
 
         # Test some configurations on Windows
         - windows: py37-test-pyqt510
@@ -61,6 +64,7 @@ jobs:
         - windows: py310-test-pyqt63
 
         - windows: py38-test-pyside515
+        - windows: py310-test-pyside63
 
         # Try out documentation build on Linux, macOS and Windows
         - linux: py39-docs-pyqt513
diff --git a/tox.ini b/tox.ini
index e17b5ddf..bd5b4154 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{37,38,39,310}-{codestyle,test,docs}-{pyqt510,pyqt511,pyqt512,pyqt513,pyqt514,pyqt515,pyside513,pyside514,pyside515,pyqt63}
+    py{37,38,39,310}-{codestyle,test,docs}-{pyqt510,pyqt511,pyqt512,pyqt513,pyqt514,pyqt515,pyside513,pyside514,pyside515,pyqt63,pyside63}
 requires = pip >= 18.0
            setuptools >= 30.3.0
 
@@ -22,6 +22,7 @@ deps =
     pyside514: PySide2==5.14.*
     pyside515: PySide2==5.15.*
     pyqt63: PyQt6==6.3.*
+    pyside63: PySide2==6.3.*
 extras =
     test
     docs: docs