diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 8695b5a7..b19aaa26 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - run: pip install -r requirements.txt
       - run: pre-commit run --all-files
       - run: mypy kopf --strict
@@ -38,7 +38,7 @@ jobs:
       fail-fast: false
       matrix:
         install-extras: [ "", "full-auth" ]
-        python-version: [ "3.7", "3.8", "3.9", "3.10" ]
+        python-version: [ "3.7", "3.8", "3.9", "3.10", "3.11" ]
     name: Python ${{ matrix.python-version }} ${{ matrix.install-extras }}
     runs-on: ubuntu-22.04
     timeout-minutes: 5  # usually 2-3 mins
@@ -108,7 +108,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - uses: nolar/setup-k3d-k3s@v1
         with:
           version: ${{ matrix.k3s }}
diff --git a/.github/workflows/publish.yaml b/.github/workflows/publish.yaml
index 1a3b25ef..994444cb 100644
--- a/.github/workflows/publish.yaml
+++ b/.github/workflows/publish.yaml
@@ -16,7 +16,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - run: pip install --upgrade setuptools wheel twine
       - run: python setup.py sdist bdist_wheel
       - uses: pypa/gh-action-pypi-publish@release/v1
diff --git a/.github/workflows/thorough.yaml b/.github/workflows/thorough.yaml
index 88f589b9..63c2933b 100644
--- a/.github/workflows/thorough.yaml
+++ b/.github/workflows/thorough.yaml
@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - run: pip install -r requirements.txt
       - run: pre-commit run --all-files
       - run: mypy kopf --strict
@@ -42,7 +42,7 @@ jobs:
       fail-fast: false
       matrix:
         install-extras: [ "", "full-auth" ]
-        python-version: [ "3.7", "3.8", "3.9", "3.10" ]
+        python-version: [ "3.7", "3.8", "3.9", "3.10", "3.11" ]
     name: Python ${{ matrix.python-version }} ${{ matrix.install-extras }}
     runs-on: ubuntu-22.04
     timeout-minutes: 5  # usually 2-3 mins
@@ -112,7 +112,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - uses: nolar/setup-k3d-k3s@v1
         with:
           version: ${{ matrix.k3s }}
@@ -134,7 +134,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - run: tools/install-minikube.sh
       - run: pip install -r requirements.txt -r examples/requirements.txt
       - run: pytest --color=yes --timeout=30 --only-e2e
diff --git a/README.md b/README.md
index 1d6a270a..836102b9 100644
--- a/README.md
+++ b/README.md
@@ -133,7 +133,7 @@ We assume that when the operator is executed in the cluster, it must be packaged
 into a docker image with a CI/CD tool of your preference.
 
 ```dockerfile
-FROM python:3.7
+FROM python:3.11
 ADD . /src
 RUN pip install kopf
 CMD kopf run /src/handlers.py --verbose
diff --git a/docs/deployment.rst b/docs/deployment.rst
index 6709ebc8..4569125b 100644
--- a/docs/deployment.rst
+++ b/docs/deployment.rst
@@ -10,13 +10,13 @@ But normally, the operators are usually deployed directly to the clusters.
 Docker image
 ============
 
-First of all, the operator must be packaged as a docker image with Python 3.7:
+First of all, the operator must be packaged as a docker image with Python 3.7 or newer:
 
 .. code-block:: dockerfile
     :caption: Dockerfile
     :name: dockerfile
 
-    FROM python:3.7
+    FROM python:3.11
     ADD . /src
     RUN pip install kopf
     CMD kopf run /src/handlers.py --verbose
diff --git a/kopf/_cogs/structs/diffs.py b/kopf/_cogs/structs/diffs.py
index 7f6d6843..e3f76901 100644
--- a/kopf/_cogs/structs/diffs.py
+++ b/kopf/_cogs/structs/diffs.py
@@ -72,6 +72,10 @@ def __init__(self, __items: Iterable[DiffItem]):
         super().__init__()
         self._items = tuple(DiffItem(*item) for item in __items)
 
+    def __hash__(self) -> int:
+        # Hashes mark diffs as immutable to be usable as dataclasses' defaults in Python 3.11.
+        return hash(self._items)
+
     def __repr__(self) -> str:
         return repr(self._items)
 
diff --git a/setup.py b/setup.py
index 2bf8ab4c..8117f9cf 100644
--- a/setup.py
+++ b/setup.py
@@ -37,6 +37,7 @@
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3 :: Only',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
diff --git a/tests/diffs/test_protocols.py b/tests/diffs/test_protocols.py
index 862bcbd1..3eeb1064 100644
--- a/tests/diffs/test_protocols.py
+++ b/tests/diffs/test_protocols.py
@@ -53,3 +53,5 @@ def test_diff_comparison_to_the_same():
         DiffItem(DiffOperation.REMOVE, ('key3',), 'old3', None),
     ])
     assert d1 == d2
+    assert hash(d1) == hash(d2)
+    assert d1 is not d2