diff --git a/pyproject.toml b/pyproject.toml
index 75e0d4a5..60becea3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,7 +62,7 @@ dev = [
    "pipdeptree",
    "pycodestyle",
    "pylint",
-   "pytest<8.0",
+   "pytest<10.0",
    "pytest-cov",
    "pytest-xdist",
    "pytest-mock~=1.0,<1.14.0",
diff --git a/requirements-3.10-dev.txt b/requirements-3.10-dev.txt
index 17f588e0..7226b27a 100644
--- a/requirements-3.10-dev.txt
+++ b/requirements-3.10-dev.txt
@@ -102,14 +102,16 @@ pydocstyle==6.3.0
 pyflakes==2.3.1
     # via flake8
 pygments==2.20.0
-    # via rich
+    # via
+    #   pytest
+    #   rich
 pylint==4.0.5
     # via howso-engine (pyproject.toml)
 pyproject-hooks==1.2.0
     # via
     #   build
     #   pip-tools
-pytest==7.4.4
+pytest==9.0.3
     # via
     #   howso-engine (pyproject.toml)
     #   pytest-cov
diff --git a/requirements-3.11-dev.txt b/requirements-3.11-dev.txt
index 4a442ff1..522a1c87 100644
--- a/requirements-3.11-dev.txt
+++ b/requirements-3.11-dev.txt
@@ -100,14 +100,16 @@ pydocstyle==6.3.0
 pyflakes==2.3.1
     # via flake8
 pygments==2.20.0
-    # via rich
+    # via
+    #   pytest
+    #   rich
 pylint==4.0.5
     # via howso-engine (pyproject.toml)
 pyproject-hooks==1.2.0
     # via
     #   build
     #   pip-tools
-pytest==7.4.4
+pytest==9.0.3
     # via
     #   howso-engine (pyproject.toml)
     #   pytest-cov
diff --git a/requirements-3.12-dev.txt b/requirements-3.12-dev.txt
index 2bd1beca..b70871db 100644
--- a/requirements-3.12-dev.txt
+++ b/requirements-3.12-dev.txt
@@ -100,14 +100,16 @@ pydocstyle==6.3.0
 pyflakes==2.3.1
     # via flake8
 pygments==2.20.0
-    # via rich
+    # via
+    #   pytest
+    #   rich
 pylint==4.0.5
     # via howso-engine (pyproject.toml)
 pyproject-hooks==1.2.0
     # via
     #   build
     #   pip-tools
-pytest==7.4.4
+pytest==9.0.3
     # via
     #   howso-engine (pyproject.toml)
     #   pytest-cov
diff --git a/requirements-3.13-dev.txt b/requirements-3.13-dev.txt
index 5d70540a..96d3dea1 100644
--- a/requirements-3.13-dev.txt
+++ b/requirements-3.13-dev.txt
@@ -100,14 +100,16 @@ pydocstyle==6.3.0
 pyflakes==2.3.1
     # via flake8
 pygments==2.20.0
-    # via rich
+    # via
+    #   pytest
+    #   rich
 pylint==4.0.5
     # via howso-engine (pyproject.toml)
 pyproject-hooks==1.2.0
     # via
     #   build
     #   pip-tools
-pytest==7.4.4
+pytest==9.0.3
     # via
     #   howso-engine (pyproject.toml)
     #   pytest-cov