diff --git a/.github/workflows/default.yml b/.github/workflows/default.yml
index d3c0952..c0a65bf 100644
--- a/.github/workflows/default.yml
+++ b/.github/workflows/default.yml
@@ -8,17 +8,13 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v3
       with:
-        python-version: "3.9"
-    - name: Cache pip packages
-      uses: actions/cache@v2
-      with:
-        path: ~/.cache/pip
-        key: lint-flake8-${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('setup.cfg') }}
-        restore-keys: |
-          lint-flake8-${{ runner.os }}-pip-${{ matrix.python-version }}
-          lint-flake8-${{ runner.os }}-pip-
+        python-version: "3.10"
+        cache: "pip"
+        cache-dependency-path: |
+          setup.cfg
+          requirements/lint.txt
     - name: Install dependencies
       run: |
         python -m pip install -U pip setuptools
@@ -50,17 +46,13 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python
-      uses: actions/setup-python@v2
-      with:
-        python-version: "3.9"
-    - name: Cache pip packages
-      uses: actions/cache@v2
+      uses: actions/setup-python@v3
       with:
-        path: ~/.cache/pip
-        key: typecheck-mypy-${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('setup.cfg') }}
-        restore-keys: |
-          typecheck-mypy-${{ runner.os }}-pip-${{ matrix.python-version }}
-          typecheck-mypy-${{ runner.os }}-pip-
+        python-version: "3.10"
+        cache: "pip"
+        cache-dependency-path: |
+          setup.cfg
+          requirements/typecheck.txt
     - name: Install dependencies
       run: |
         python -m pip install -U pip setuptools
@@ -93,17 +85,13 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v3
       with:
-        python-version: "3.9"
-    - name: Cache pip packages
-      uses: actions/cache@v2
-      with:
-        path: ~/.cache/pip
-        key: test-pytest-${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('setup.cfg') }}
-        restore-keys: |
-          test-pytest-${{ runner.os }}-pip-${{ matrix.python-version }}
-          test-pytest-${{ runner.os }}-pip-
+        python-version: "3.10"
+        cache: "pip"
+        cache-dependency-path: |
+          setup.cfg
+          requirements/test.txt
     - name: Install dependencies
       run: |
         python -m pip install -U pip setuptools
@@ -137,17 +125,13 @@ jobs:
       with:
         submodules: true
     - name: Set up Python
-      uses: actions/setup-python@v2
-      with:
-        python-version: "3.9"
-    - name: Cache pip packages
-      uses: actions/cache@v2
+      uses: actions/setup-python@v3
       with:
-        path: ~/.cache/pip
-        key: deploy-pypi-${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('setup.cfg') }}
-        restore-keys: |
-          test-pytest-${{ runner.os }}-pip-${{ matrix.python-version }}
-          test-pytest-${{ runner.os }}-pip-
+        python-version: "3.10"
+        cache: "pip"
+        cache-dependency-path: |
+          setup.cfg
+          requirements/build.txt
     - name: Install dependencies
       run: |
         python -m pip install -U pip setuptools
diff --git a/.github/workflows/timeline-check.yml b/.github/workflows/timeline-check.yml
index ce2505a..0f450e1 100644
--- a/.github/workflows/timeline-check.yml
+++ b/.github/workflows/timeline-check.yml
@@ -12,21 +12,16 @@ jobs:
       with:
         fetch-depth: 0
     - name: Set up Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v3
       with:
-        python-version: 3.9
-    - name: Cache pip packages
-      uses: actions/cache@v2
-      with:
-        path: ~/.cache/pip
-        key: lint-towncrier-${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('setup.cfg') }}
-        restore-keys: |
-          lint-towncrier-${{ runner.os }}-pip-${{ matrix.python-version }}
-          lint-towncrier-${{ runner.os }}-pip-
+        python-version: "3.10"
+        cache: "pip"
+        cache-dependency-path: |
+          requirements/timeline-check.txt
     - name: Install dependencies
       run: |
         python -m pip install -U pip setuptools
-        python -m pip install -U towncrier
+        python -m pip install -U -r requirements/timeline-check.txt
     - name: Check existence of news fragment
       run: |
         git fetch --no-tags origin +refs/heads/${BASE_BRANCH}:refs/remotes/origin/${BASE_BRANCH}
diff --git a/changes/52.breaking.md b/changes/52.breaking.md
new file mode 100644
index 0000000..d37225f
--- /dev/null
+++ b/changes/52.breaking.md
@@ -0,0 +1 @@
+Now it requires Python 3.10 or higher to run.
diff --git a/requirements/timeline-check.txt b/requirements/timeline-check.txt
new file mode 100644
index 0000000..3c9c7c0
--- /dev/null
+++ b/requirements/timeline-check.txt
@@ -0,0 +1 @@
+towncrier~=21.9
diff --git a/setup.cfg b/setup.cfg
index bda47d1..5d09e43 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -12,7 +12,7 @@ classifiers =
     Intended Audience :: Developers
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
     Operating System :: POSIX
     Operating System :: MacOS :: MacOS X
     Environment :: No Input/Output (Daemon)
@@ -25,7 +25,7 @@ project_urls =
 package_dir =
     = src
 packages = find_namespace:
-python_requires = >=3.9
+python_requires = >=3.10
 setup_requires =
     setuptools>=54.2.0
 install_requires =
@@ -43,7 +43,7 @@ install_requires =
     setproctitle>=1.2.1
     toml>=0.10.0
     yarl>=1.7.2
-    backend.ai-client~=22.3.0.dev0
+    backend.ai-client~=22.3.0a1
 zip_safe = false
 include_package_data = true
 
@@ -53,9 +53,9 @@ build =
     twine>=3.4.1
     towncrier~=21.9.0
 test =
-    pytest~=6.2.5
-    pytest-asyncio~=0.16.0
-    pytest-aiohttp~=0.3.0
+    pytest~=7.1.0
+    pytest-asyncio~=0.18.2
+    pytest-aiohttp~=1.0.4
     pytest-cov
     pytest-mock~=3.5.1
     codecov
@@ -63,7 +63,7 @@ dev =
 lint =
     flake8>=4.0.1
 typecheck =
-    mypy>=0.910
+    mypy>=0.940
     types-pkg_resources
     types-toml