diff --git a/.github/workflows/ci-tests.yml b/.github/workflows/ci-tests.yml
index 08bb96e07..87ddaa71e 100644
--- a/.github/workflows/ci-tests.yml
+++ b/.github/workflows/ci-tests.yml
@@ -32,7 +32,7 @@ jobs:
     strategy:
       matrix:
         py-ver-major: [3]
-        py-ver-minor: [9, 10, 11, 12, 13]
+        py-ver-minor: [9, 10, 11, 12, 13, 14]
         step: [lint, unit, bandit, mypy]
 
     env:
@@ -64,6 +64,9 @@ jobs:
             requirements.txt
             tox.ini
 
+      - name: install dev libraries
+        run: sudo apt-get install -y libxml2-dev libxslt-dev
+
       - name: Upgrade setuptools and install tox
         run: |
           pip install -U pip setuptools wheel
diff --git a/mypy-requirements.txt b/mypy-requirements.txt
index 09e9739fb..a8676ac56 100644
--- a/mypy-requirements.txt
+++ b/mypy-requirements.txt
@@ -6,5 +6,5 @@ types-requests
 types-setuptools
 types-psutil
 types-mock
-galaxy-tool-util>=22.1.2,!=23.0.1,!=23.0.2,!=23.0.3,!=23.0.4,!=23.0.5,<25.1
-galaxy-util<25.1
+galaxy-tool-util>=22.1.2,!=23.0.1,!=23.0.2,!=23.0.3,!=23.0.4,!=23.0.5,<25.1; python_version < "3.14"
+galaxy-util<25.1; python_version < "3.14"
diff --git a/setup.py b/setup.py
index 8f8098f0a..3181938b6 100644
--- a/setup.py
+++ b/setup.py
@@ -170,7 +170,7 @@ def _find_package_data(base: str, globs: list[str], root: str = "cwltool") -> li
             "pillow",  # workaround for https://github.com/galaxyproject/galaxy/pull/20525
         ],
     },
-    python_requires=">=3.9, <3.14",
+    python_requires=">=3.9, <3.15",
     use_scm_version=True,
     setup_requires=PYTEST_RUNNER + ["setuptools_scm>=8.0.4,<9"],
     test_suite="tests",
@@ -201,6 +201,7 @@ def _find_package_data(base: str, globs: list[str], root: str = "cwltool") -> li
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Topic :: Scientific/Engineering",
         "Topic :: Scientific/Engineering :: Bio-Informatics",
         "Topic :: Scientific/Engineering :: Astronomy",
diff --git a/test-requirements.txt b/test-requirements.txt
index 42565f630..cb96a7ae1 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -9,5 +9,5 @@ pytest-mock>=1.10.0
 pytest-cov
 arcp>=0.2.0
 -r requirements.txt
-galaxy-tool-util>=22.1.2,!=23.0.1,!=23.0.2,!=23.0.3,!=23.0.4,!=23.0.5,<25.1
-galaxy-util<25.1
+galaxy-tool-util>=22.1.2,!=23.0.1,!=23.0.2,!=23.0.3,!=23.0.4,!=23.0.5,<25.1; python_version < "3.14"
+galaxy-util<25.1; python_version < "3.14"
diff --git a/tox.ini b/tox.ini
index f24cb03a9..aa95d5941 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,9 +1,9 @@
 [tox]
 envlist =
-  py3{9,10,11,12,13}-lint
-  py3{9,10,11,12,13}-unit
-  py3{9,10,11,12,13}-bandit
-  py3{9,10,11,12,13}-mypy
+  py3{9,10,11,12,13,14}-lint
+  py3{9,10,11,12,13,14}-unit
+  py3{9,10,11,12,13,14}-bandit
+  py3{9,10,11,12,13,14}-mypy
   py312-lintreadme
   py312-shellcheck
   py312-pydocstyle
@@ -21,16 +21,17 @@ python =
   3.11: py311
   3.12: py312
   3.13: py313
+  3.14: py314
 
 [testenv]
 skipsdist =
-  py3{9,10,11,12,13}-!{unit,mypy,lintreadme} = True
+  py3{9,10,11,12,13,14}-!{unit,mypy,lintreadme} = True
 
 description =
-  py3{9,10,11,12,13}-unit: Run the unit tests
-  py3{9,10,11,12,13}-lint: Lint the Python code
-  py3{9,10,11,12,13}-bandit: Search for common security issues
-  py3{9,10,11,12,13}-mypy: Check for type safety
+  py3{9,10,11,12,13,14}-unit: Run the unit tests
+  py3{9,10,11,12,13,14}-lint: Lint the Python code
+  py3{9,10,11,12,13,14}-bandit: Search for common security issues
+  py3{9,10,11,12,13,14}-mypy: Check for type safety
   py312-pydocstyle: docstring style checker
   py312-shellcheck: syntax check for shell scripts
   py312-lintreadme: Lint the README.rst→.md conversion
@@ -46,11 +47,11 @@ extras =
   py3{9,10,11,12,13}-unit: deps
 
 deps =
-  py3{9,10,11,12,13}-{unit,lint,bandit,mypy}: -rrequirements.txt
-  py3{9,10,11,12,13}-{unit,mypy}: -rtest-requirements.txt
-  py3{9,10,11,12,13}-lint: -rlint-requirements.txt
-  py3{9,10,11,12,13}-bandit: bandit
-  py3{9,10,11,12,13}-mypy: -rmypy-requirements.txt
+  py3{9,10,11,12,13,14}-{unit,lint,bandit,mypy}: -rrequirements.txt
+  py3{9,10,11,12,13,14}-{unit,mypy}: -rtest-requirements.txt
+  py3{9,10,11,12,13,14}-lint: -rlint-requirements.txt
+  py3{9,10,11,12,13,14}-bandit: bandit
+  py3{9,10,11,12,13,14}-mypy: -rmypy-requirements.txt
   py312-pydocstyle: pydocstyle
   py312-pydocstyle: diff-cover
   py312-lintreadme: twine
@@ -66,15 +67,16 @@ commands_pre =
   py312-lintreadme: python -m build --outdir {distdir}
 
 commands =
-  py3{9,10,11,12,13}-unit: make coverage-report coverage.xml PYTEST_EXTRA="{posargs}"
-  py3{9,10,11,12,13}-bandit: bandit -r cwltool
-  py3{9,10,11,12,13}-lint: make flake8 format-check codespell-check
+  py3{9,10,11,12,13,14}-unit: make coverage-report coverage.xml PYTEST_EXTRA="{posargs}"
+  py3{9,10,11,12,13,14}-bandit: bandit -r cwltool
+  py3{9,10,11,12,13,14}-lint: make flake8 format-check codespell-check
   py3{9,10,11,12,13}-mypy: make mypy mypyc PYTEST_EXTRA="{posargs}"
+  py314-mypy: make mypyc PYTEST_EXTRA="{posargs}"
   py312-shellcheck: make shellcheck
   py312-pydocstyle: make diff_pydocstyle_report
   py312-lintreadme: twine check {distdir}/*
 
 skip_install =
-  py3{9,10,11,12,13}-{bandit,lint,mypy,shellcheck,pydocstyle,lintreadme}: true
+  py3{9,10,11,12,13,14}-{bandit,lint,mypy,shellcheck,pydocstyle,lintreadme}: true
 
 allowlist_externals = make