diff --git a/.github/workflows/formatting.yml b/.github/workflows/formatting.yml
index de5d4ae..b18c8f2 100644
--- a/.github/workflows/formatting.yml
+++ b/.github/workflows/formatting.yml
@@ -2,13 +2,25 @@ name: "Formatting"
 
 on: [push]
 jobs:
+  # The matrix "tool" values ("black", "isort") and the job's required-check names they produce
+  # ("black (3.11, ubuntu-latest, black)", "black (3.11, ubuntu-latest, isort)") are kept unchanged
+  # on purpose, even though both now run ruff under the hood - renaming them would leave the
+  # required status checks configured on the branch protection ruleset permanently pending.
+  # Renaming these labels for real requires updating that ruleset in the same change, which is an
+  # admin-level, org-visible change to what blocks merges and is intentionally out of scope here.
   black:
+    name: black (${{ matrix.python-version }}, ${{ matrix.os }}, ${{ matrix.tool }})
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         python-version: ["3.11"]
         os: [ubuntu-latest]
         tool: ["black", "isort"]
+        include:
+          - tool: "black"
+            command: "ruff format --check ."
+          - tool: "isort"
+            command: "ruff check --select I ."
     steps:
       - uses: actions/checkout@v7
       - name: Install uv
@@ -16,6 +28,6 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
-        run: uv sync --group formatting
+        run: uv sync --group linting
       - name: ${{ matrix.tool }} Code Formatter
-        run: uv run ${{ matrix.tool }} . --check
+        run: uv run ${{ matrix.command }}
diff --git a/.github/workflows/python-publish.yml b/.github/workflows/python-publish.yml
index 5b7bc75..d3e7669 100644
--- a/.github/workflows/python-publish.yml
+++ b/.github/workflows/python-publish.yml
@@ -64,11 +64,9 @@
            cd bo4e_schemas
            uv run bost -t v202401.0.1 -o ./
            uv run bo4e-generator -i ./ -o ../src/borm/models -ot sql_model
-       - name: Run pylint
+       - name: Run ruff check
          run: |
-           uv run pylint src/borm --disable R0801 --ignore-paths 'src/borm/models'
-           uv run pylint src/borm/models --rcfile=./.pylintrc_autogen_code
-           uv run pylint tests --rcfile=tests/.pylintrc
+           uv run ruff check src/borm tests
 
        # coverage
        - name: Install Dependencies (coverage)
diff --git a/.github/workflows/pythonlint.yml b/.github/workflows/pythonlint.yml
index 31aaa8a..2d490a2 100644
--- a/.github/workflows/pythonlint.yml
+++ b/.github/workflows/pythonlint.yml
@@ -32,12 +32,10 @@ jobs:
           cd bo4e_schemas
           uv run bost -t v202401.0.1 -o ./
           uv run bo4e-generator -i ./ -o ../src/borm/models -ot sql_model
-      - name: Run pylint
+      - name: Run ruff check
         if: matrix.linter-env == 'linting'
         run: |
-          uv run pylint src/borm --disable R0801 --ignore-paths 'src/borm/models'
-          uv run pylint src/borm/models --rcfile=./.pylintrc_autogen_code
-          uv run pylint tests --rcfile=tests/.pylintrc
+          uv run ruff check src/borm tests
       - name: Run mypy
         if: matrix.linter-env == 'type_check'
         run: |
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 4ca5e22..2f005b1 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -6,22 +6,12 @@ repos:
       - id: check-yaml
       - id: end-of-file-fixer
       - id: trailing-whitespace
-  - repo: https://github.com/psf/black
-    rev: 25.1.0
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.16.0
     hooks:
-      - id: black
-        language_version: python3
-  - repo: https://github.com/pycqa/isort
-    rev: 5.13.2
-    hooks:
-      - id: isort
-        name: isort (python)
-      - id: isort
-        name: isort (cython)
-        types: [cython]
-      - id: isort
-        name: isort (pyi)
-        types: [pyi]
+      - id: ruff-check
+        args: [--fix]
+      - id: ruff-format
   - repo: https://github.com/astral-sh/uv-pre-commit
     rev: 0.11.32
     hooks:
diff --git a/.pylintrc_autogen_code b/.pylintrc_autogen_code
deleted file mode 100644
index fe97f24..0000000
--- a/.pylintrc_autogen_code
+++ /dev/null
@@ -1,11 +0,0 @@
-[pylint]
-#run for the code generated files
-#know things to be fixed:
-disable =
-    R0801, # disable similar lines
-    C0114,  # disable missing-module-docstring
-    C0115,  # disable missing-class-docstring
-    W0611, # disable unused-import
-    C0301, # disable line-too-long ->lines in comments too long
-    C0302, # disable too-many-lines -> many-many relationship classes
-[pylint."MESSAGES CONTROL"]
diff --git a/README.md b/README.md
index bc36d2c..38ea37c 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 ![Unittests status badge](https://github.com/Hochfrequenz/bo4e-python-orm/workflows/tests/badge.svg)
 ![Coverage status badge](https://github.com/Hochfrequenz/bo4e-python-orm/workflows/Coverage/badge.svg)
 ![Linting status badge](https://github.com/Hochfrequenz/bo4e-python-orm/workflows/Linting/badge.svg)
-![Black status badge](https://github.com/Hochfrequenz/bo4e-python-orm/workflows/Formatting/badge.svg)
+![Formatting status badge](https://github.com/Hochfrequenz/bo4e-python-orm/workflows/Formatting/badge.svg)
 
 At this point this repository serves only as an exemplary implementation of a BO4E ORM. The main work (i.e. the generation of SQL Model code) will be done in the [BO4E-CLI-Tool](https://github.com/bo4e/BO4E-CLI)
 
diff --git a/pyproject.toml b/pyproject.toml
index 7a2e14d..2adb07e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,15 +35,32 @@ dynamic = ["readme", "version"]
 Changelog = "https://github.com/Hochfrequenz/bo4e-python-orm/releases"
 Homepage = "https://github.com/Hochfrequenz/bo4e-python-orm"
 
-[tool.black]
+[tool.ruff]
 line-length = 120
+extend-exclude = ["*.md"]
 
-[tool.isort]
-line_length = 120
-profile = "black"
+[tool.ruff.lint]
+select = ["E", "W", "F", "I", "UP", "B", "N", "PL", "RUF"]
+ignore = [
+    "PLR0913", # too-many-arguments
+    "PLR0917", # too-many-positional-arguments
+    "PLR0912", # too-many-branches
+    "PLR0915", # too-many-statements
+    "RUF001",  # ambiguous-unicode-character-string
+    "RUF002",  # ambiguous-unicode-character-docstring
+    "RUF003",  # ambiguous-unicode-character-comment
+]
+
+[tool.ruff.lint.isort]
+# src/borm/models is only generated by some CI jobs' "Generate BO4E models" step, so whether
+# "borm.models" resolves on disk - and thus whether ruff's isort classifies it as first-party -
+# depends on which job runs. Pinning it here keeps import-sort order consistent across jobs.
+known-first-party = ["borm"]
 
-[tool.pylint."MESSAGES CONTROL"]
-max-line-length = 120
+[tool.ruff.lint.per-file-ignores]
+# src/borm/models is autogenerated from the BO4E schemas at CI time (not present in this checkout);
+# mirrors the old .pylintrc_autogen_code disables (unused-import, line-too-long).
+"src/borm/models/**" = ["F401", "E501"]
 
 [build-system]
 requires = ["hatchling>=1.31.0", "hatch-vcs", "hatch-fancy-pypi-readme"]
@@ -56,18 +73,13 @@ tests = [
 coverage = [
     "coverage==7.15.2"
 ]
-formatting = [
-    "black==26.5.1",
-    "isort==5.13.2"
-]
 init_bo4e = [
     "bo4e-python-generator==0.0.13",
     "bo4e-schema-tool==0.0.9",
     "datamodel-code-generator==0.25.9"
 ]
 linting = [
-    "pylint==4.0.6",
-    {include-group = "tests"}
+    "ruff==0.16.0",
 ]
 spell_check = [
     "codespell==2.4.3"
@@ -80,7 +92,6 @@ dev = [
     "pre-commit",
     {include-group = "tests"},
     {include-group = "coverage"},
-    {include-group = "formatting"},
     {include-group = "init_bo4e"},
     {include-group = "linting"},
     {include-group = "spell_check"},
diff --git a/src/borm/db/base_class.py b/src/borm/db/base_class.py
index 3e183a3..521db46 100644
--- a/src/borm/db/base_class.py
+++ b/src/borm/db/base_class.py
@@ -14,4 +14,5 @@ class MappingBase(DeclarativeBase):
     """
     Base class which inherits from DeclarativeBase
     """
+
     metadata = metadata
diff --git a/src/borm/db/mysql_db/alembic.ini b/src/borm/db/mysql_db/alembic.ini
index 90f8702..65c65e0 100644
--- a/src/borm/db/mysql_db/alembic.ini
+++ b/src/borm/db/mysql_db/alembic.ini
@@ -17,11 +17,11 @@ version_path_separator = os.pathsep  # Use os.pathsep. Default configuration use
 # on newly generated revision scripts.  See the documentation for further
 # detail and examples
 
-# format using "black" - use the console_scripts runner, against the "black" entrypoint
-hooks = black
-black.type = console_scripts
-black.entrypoint = black
-black.options = -l 120 REVISION_SCRIPT_FILENAME
+# format using "ruff format" - use the exec runner, against the "ruff" executable on PATH
+hooks = ruff_format
+ruff_format.type = exec
+ruff_format.executable = ruff
+ruff_format.options = format REVISION_SCRIPT_FILENAME
 
 # Logging configuration
 [loggers]
diff --git a/src/borm/db/mysql_db/auxiliary.py b/src/borm/db/mysql_db/auxiliary.py
index 590d74c..0ae3136 100644
--- a/src/borm/db/mysql_db/auxiliary.py
+++ b/src/borm/db/mysql_db/auxiliary.py
@@ -18,7 +18,7 @@ def get_url() -> str:
     port = os.getenv("MYSQL_PORT")
     db = os.getenv("MYSQL_DB")
     if user is None and password is None and server is None and db is None and port is None:
-        raise IOError("Could not load .env file.")
+        raise OSError("Could not load .env file.")
     if user is None or password is None or server is None or db is None or port is None:
         raise KeyError(
             f"Couldn't find all environment variables:\n"
diff --git a/src/borm/db/mysql_db/migrations/versions/d73a00baaa17_init.py b/src/borm/db/mysql_db/migrations/versions/d73a00baaa17_init.py
index 2e2e55c..83d466c 100644
--- a/src/borm/db/mysql_db/migrations/versions/d73a00baaa17_init.py
+++ b/src/borm/db/mysql_db/migrations/versions/d73a00baaa17_init.py
@@ -6,16 +6,13 @@
 
 """
 
-from typing import Sequence, Union
-
-import sqlalchemy as sa
-from alembic import op
+from collections.abc import Sequence
 
 # revision identifiers, used by Alembic.
 revision: str = "d73a00baaa17"
-down_revision: Union[str, None] = None
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
+down_revision: str | None = None
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
 
 
 def upgrade() -> None:
diff --git a/src/borm/db/postgresql_db/alembic.ini b/src/borm/db/postgresql_db/alembic.ini
index 5ecfbef..ed36924 100644
--- a/src/borm/db/postgresql_db/alembic.ini
+++ b/src/borm/db/postgresql_db/alembic.ini
@@ -20,11 +20,11 @@ version_path_separator = os.pathsep  # Use os.pathsep. Default configuration use
 # on newly generated revision scripts.  See the documentation for further
 # detail and examples
 
-# format using "black" - use the console_scripts runner, against the "black" entrypoint
-hooks = black
-black.type = console_scripts
-black.entrypoint = black
-black.options = -l 120 REVISION_SCRIPT_FILENAME
+# format using "ruff format" - use the exec runner, against the "ruff" executable on PATH
+hooks = ruff_format
+ruff_format.type = exec
+ruff_format.executable = ruff
+ruff_format.options = format REVISION_SCRIPT_FILENAME
 
 # Logging configuration
 [loggers]
diff --git a/src/borm/db/postgresql_db/auxiliary.py b/src/borm/db/postgresql_db/auxiliary.py
index e3e811e..e6aee66 100644
--- a/src/borm/db/postgresql_db/auxiliary.py
+++ b/src/borm/db/postgresql_db/auxiliary.py
@@ -18,7 +18,7 @@ def get_url() -> str:
     port = os.getenv("POSTGRES_PORT")
     database = os.getenv("POSTGRES_DB")
     if user is None and password is None and server is None and database is None and port is None:
-        raise IOError("Could not load .env file.")
+        raise OSError("Could not load .env file.")
     if user is None or password is None or server is None or database is None or port is None:
         raise KeyError(
             f"Couldn't find all environment variables:\n"
diff --git a/src/borm/db/postgresql_db/migrations/versions/9f7a0a61d21e_init.py b/src/borm/db/postgresql_db/migrations/versions/9f7a0a61d21e_init.py
index c12e5ad..dd47116 100644
--- a/src/borm/db/postgresql_db/migrations/versions/9f7a0a61d21e_init.py
+++ b/src/borm/db/postgresql_db/migrations/versions/9f7a0a61d21e_init.py
@@ -6,16 +6,13 @@
 
 """
 
-from typing import Sequence, Union
-
-import sqlalchemy as sa
-from alembic import op
+from collections.abc import Sequence
 
 # revision identifiers, used by Alembic.
 revision: str = "9f7a0a61d21e"
-down_revision: Union[str, None] = None
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
+down_revision: str | None = None
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
 
 
 def upgrade() -> None:
diff --git a/tests/.pylintrc b/tests/.pylintrc
deleted file mode 100644
index f6cc96b..0000000
--- a/tests/.pylintrc
+++ /dev/null
@@ -1,11 +0,0 @@
-[pylint]
-# for the unittests disable some pylint warnings, e.g. we don't want to force devs to write docstrings for every test
-disable =
-    C0114,  # disable missing-module-docstring
-    C0115,  # disable missing-class-docstring
-    C0116,  # disable missing-function-docstring
-    R0903,  # disable too-few-public-methods
-    W0621,  # disable redefined-outer-name (this is for the use of pytest fixtures)
-    R0801,  # disable duplicate-code (we prefer our test to be explicit rather than perfectly redundancy free)
-[pylint."MESSAGES CONTROL"]
-max-line-length = 120
diff --git a/tests/integrationtests/conftest.py b/tests/integrationtests/conftest.py
index 88e0210..073e3ff 100644
--- a/tests/integrationtests/conftest.py
+++ b/tests/integrationtests/conftest.py
@@ -1,4 +1,4 @@
-from typing import Generator
+from collections.abc import Generator
 
 import pytest
 from sqlmodel import Session, SQLModel
diff --git a/uv.lock b/uv.lock
index 8483fad..1d271b5 100644
--- a/uv.lock
+++ b/uv.lock
@@ -82,15 +82,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/66/40/c53deb2cd0c9b0fb636d24d9f40924cf2e65028e6b20b10cd5c1eeb2c730/ast_serialize-0.6.0-cp39-abi3-win_arm64.whl", hash = "sha256:ccd132fe8db56f61fe743b1f644d01b8d65b83248a8da506f3132bda86d6ed5e", size = 1072965, upload-time = "2026-06-30T20:02:54.097Z" },
 ]
 
-[[package]]
-name = "astroid"
-version = "4.0.4"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/07/63/0adf26577da5eff6eb7a177876c1cfa213856be9926a000f65c4add9692b/astroid-4.0.4.tar.gz", hash = "sha256:986fed8bcf79fb82c78b18a53352a0b287a73817d6dbcfba3162da36667c49a0", size = 406358, upload-time = "2026-02-07T23:35:07.509Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/b0/cf/1c5f42b110e57bc5502eb80dbc3b03d256926062519224835ef08134f1f9/astroid-4.0.4-py3-none-any.whl", hash = "sha256:52f39653876c7dec3e3afd4c2696920e05c83832b9737afc21928f2d2eb7a753", size = 276445, upload-time = "2026-02-07T23:35:05.344Z" },
-]
-
 [[package]]
 name = "black"
 version = "26.5.1"
@@ -179,21 +170,15 @@ coverage = [
     { name = "coverage" },
 ]
 dev = [
-    { name = "black" },
     { name = "bo4e-python-generator" },
     { name = "bo4e-schema-tool" },
     { name = "codespell" },
     { name = "coverage" },
     { name = "datamodel-code-generator" },
-    { name = "isort" },
     { name = "mypy" },
     { name = "pre-commit" },
-    { name = "pylint" },
     { name = "pytest" },
-]
-formatting = [
-    { name = "black" },
-    { name = "isort" },
+    { name = "ruff" },
 ]
 init-bo4e = [
     { name = "bo4e-python-generator" },
@@ -201,8 +186,7 @@ init-bo4e = [
     { name = "datamodel-code-generator" },
 ]
 linting = [
-    { name = "pylint" },
-    { name = "pytest" },
+    { name = "ruff" },
 ]
 spell-check = [
     { name = "codespell" },
@@ -233,31 +217,22 @@ requires-dist = [
 [package.metadata.requires-dev]
 coverage = [{ name = "coverage", specifier = "==7.15.2" }]
 dev = [
-    { name = "black", specifier = "==26.5.1" },
     { name = "bo4e-python-generator", specifier = "==0.0.13" },
     { name = "bo4e-schema-tool", specifier = "==0.0.9" },
     { name = "codespell", specifier = "==2.4.3" },
     { name = "coverage", specifier = "==7.15.2" },
     { name = "datamodel-code-generator", specifier = "==0.25.9" },
-    { name = "isort", specifier = "==5.13.2" },
     { name = "mypy", specifier = "==2.3.0" },
     { name = "pre-commit" },
-    { name = "pylint", specifier = "==4.0.6" },
     { name = "pytest", specifier = "==9.1.1" },
-]
-formatting = [
-    { name = "black", specifier = "==26.5.1" },
-    { name = "isort", specifier = "==5.13.2" },
+    { name = "ruff", specifier = "==0.16.0" },
 ]
 init-bo4e = [
     { name = "bo4e-python-generator", specifier = "==0.0.13" },
     { name = "bo4e-schema-tool", specifier = "==0.0.9" },
     { name = "datamodel-code-generator", specifier = "==0.25.9" },
 ]
-linting = [
-    { name = "pylint", specifier = "==4.0.6" },
-    { name = "pytest", specifier = "==9.1.1" },
-]
+linting = [{ name = "ruff", specifier = "==0.16.0" }]
 spell-check = [{ name = "codespell", specifier = "==2.4.3" }]
 tests = [{ name = "pytest", specifier = "==9.1.1" }]
 type-check = [
@@ -657,15 +632,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/b9/68/b3ade2468b649a78561ec2f64222a32d27c83d2e3612cc1846703d489ffd/datamodel_code_generator-0.25.9-py3-none-any.whl", hash = "sha256:9e0324233123d6e39a35bc0004771956935889a974aacfd7a0651de11d2219a9", size = 110721, upload-time = "2024-08-07T03:11:02.237Z" },
 ]
 
-[[package]]
-name = "dill"
-version = "0.4.1"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/81/e1/56027a71e31b02ddc53c7d65b01e68edf64dea2932122fe7746a516f75d5/dill-0.4.1.tar.gz", hash = "sha256:423092df4182177d4d8ba8290c8a5b640c66ab35ec7da59ccfa00f6fa3eea5fa", size = 187315, upload-time = "2026-01-19T02:36:56.85Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/1e/77/dc8c558f7593132cf8fefec57c4f60c83b16941c574ac5f619abb3ae7933/dill-0.4.1-py3-none-any.whl", hash = "sha256:1e1ce33e978ae97fcfcff5638477032b801c46c7c65cf717f95fbc2248f79a9d", size = 120019, upload-time = "2026-01-19T02:36:55.663Z" },
-]
-
 [[package]]
 name = "distlib"
 version = "0.4.3"
@@ -689,8 +655,8 @@ name = "email-validator"
 version = "2.3.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "dnspython", marker = "python_full_version < '4'" },
-    { name = "idna", marker = "python_full_version < '4'" },
+    { name = "dnspython" },
+    { name = "idna" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/f5/22/900cb125c76b7aaa450ce02fd727f452243f2e91a61af068b40adba60ea9/email_validator-2.3.0.tar.gz", hash = "sha256:9fc05c37f2f6cf439ff414f8fc46d917929974a82244c20eb10231ba60c54426", size = 51238, upload-time = "2025-08-26T13:09:06.831Z" }
 wheels = [
@@ -1010,15 +976,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/70/bc/6f1c2f612465f5fa89b95bead1f44dcb607670fd42891d8fdcd5d039f4f4/markupsafe-3.0.3-cp314-cp314t-win_arm64.whl", hash = "sha256:32001d6a8fc98c8cb5c947787c5d08b0a50663d139f1305bac5885d98d9b40fa", size = 14146, upload-time = "2025-09-27T18:37:28.327Z" },
 ]
 
-[[package]]
-name = "mccabe"
-version = "0.7.0"
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