diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 4b42ea2a..b3d97de8 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -52,7 +52,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.10-v7.3.15"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14", "pypy-3.10-v7.3.15"]
         zk-version: ["3.6.4", "3.7.2", "3.8.3", "3.9.1"]
         include:
           - python-version: "3.8"
@@ -65,6 +65,10 @@ jobs:
             tox-env: py311
           - python-version: "3.12"
             tox-env: py312
+          - python-version: "3.13"
+            tox-env: py313
+          - python-version: "3.14"
+            tox-env: py314
           - python-version: "pypy-3.10-v7.3.15"
             tox-env: pypy3
     steps:
diff --git a/constraints.txt b/constraints.txt
index 65926fcd..bdf71ee7 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -1,8 +1,12 @@
 # Consistent testing environment.
 black==22.10.0
-coverage==6.3.2
+coverage==6.3.2; python_version=="3.8"
+coverage==7.10.7; python_version > "3.8"
 flake8==5.0.2
 objgraph==3.5.0
-pytest==6.2.5
-pytest-cov==3.0.0
-pytest-timeout==2.2.0
+pytest==6.2.5; python_version=="3.8"
+pytest==8.4.2; python_version > "3.8"
+pytest-cov==3.0.0; python_version=="3.8"
+pytest-cov==7.0.0; python_version > "3.8"
+pytest-timeout==2.2.0; python_version=="3.8"
+pytest-timeout==2.4.0; python_version > "3.8"