diff --git a/.github/workflows/test-elementpath.yml b/.github/workflows/test-elementpath.yml
index 9fe9f6a8..6b42e7fd 100644
--- a/.github/workflows/test-elementpath.yml
+++ b/.github/workflows/test-elementpath.yml
@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.8, 3.9, "3.10", 3.11, 3.12, "3.13.0", "3.14.0-alpha.1", "pypy-3.10"]
+        python-version: [3.8, 3.9, "3.10", 3.11, 3.12, "3.13.0", "3.14.0-alpha.3", "pypy-3.10"]
         exclude:
           - os: macos-latest
             python-version: 3.8
@@ -44,7 +44,7 @@ jobs:
           pip install mypy==1.13.0 xmlschema lxml-stubs
           mypy --show-error-codes --strict elementpath
       - name: Install optional dependencies
-        if: ${{ matrix.python-version != '3.14.0-alpha.1' }}
+        if: ${{ matrix.python-version != '3.14.0-alpha.3' }}
         run: pip install lxml
       - name: Test with unittest
         run: |
diff --git a/tox.ini b/tox.ini
index d566a2da..1f617cf4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,7 @@ min_version = 4.0
 envlist =
     py{38,39,310,311,312,313,314}, pypy3, docs, flake8,
     mypy-py{38,39,310,311,312,313,py3}, pytest, coverage,
-    xmlschema{251,302,310,321,332,342}, w3c-xsdtests
+    xmlschema{251,302,310,321,332,342,343}, w3c-xsdtests
 skip_missing_interpreters = true
 work_dir = {tox_root}/../.tox/elementpath
 
@@ -71,7 +71,7 @@ deps =
 commands =
     pytest tests -ra
 
-[testenv:xmlschema{251,302,310,321,332,342}]
+[testenv:xmlschema{251,302,310,321,332,342,343}]
 description = Run xmlschema tests and mypy on xmlschema source (>=3.1.0)
 platform = (linux|darwin)
 set_env =
@@ -81,6 +81,7 @@ set_env =
     xmlschema321: VERSION = 3.2.1
     xmlschema332: VERSION = 3.3.2
     xmlschema342: VERSION = 3.4.2
+    xmlschema343: VERSION = 3.4.3
 change_dir = {env_tmp_dir}
 deps =
     mypy==1.11.2