diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index c48fea61050..354b3f8a08d 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -11,7 +11,7 @@ repos:
         exclude: test-data/ert/eclipse/parse/ERROR.PRT # exact format is needed for testing
 
 -   repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.7.3
+    rev: v0.8.0
     hooks:
     - id: ruff
       args: [ --fix ]
diff --git a/src/_ert/forward_model_runner/forward_model_step.py b/src/_ert/forward_model_runner/forward_model_step.py
index 6acd3428110..bc4b649e0e8 100644
--- a/src/_ert/forward_model_runner/forward_model_step.py
+++ b/src/_ert/forward_model_runner/forward_model_step.py
@@ -354,7 +354,7 @@ def _check_job_files(self) -> list[str]:
 
     def _check_target_file_is_written(
         self, target_file_mtime: int, timeout: int = 5
-    ) -> None | str:
+    ) -> str | None:
         """
         Check whether or not a target_file eventually appear. Returns None in
         case of success, an error message in the case of failure.
diff --git a/src/ert/config/parsing/config_schema_item.py b/src/ert/config/parsing/config_schema_item.py
index ae289679b80..a7947800744 100644
--- a/src/ert/config/parsing/config_schema_item.py
+++ b/src/ert/config/parsing/config_schema_item.py
@@ -198,7 +198,7 @@ def apply_constraints(
         keyword: FileContextToken,
         cwd: str,
     ) -> Union[
-        T, MaybeWithContext, None, ContextList[Union[T, MaybeWithContext, None]]
+        T, MaybeWithContext, ContextList[Union[T, MaybeWithContext, None]], None
     ]:
         errors: List[Union[ErrorInfo, ConfigValidationError]] = []
 
diff --git a/src/ert/scheduler/lsf_driver.py b/src/ert/scheduler/lsf_driver.py
index 2f45b2bde5c..df761d128a0 100644
--- a/src/ert/scheduler/lsf_driver.py
+++ b/src/ert/scheduler/lsf_driver.py
@@ -371,7 +371,9 @@ async def submit(
                 self._job_error_message_by_iens[iens] = process_message
                 raise FailedSubmit(process_message)
 
-            match = re.search("Job <([0-9]+)> is submitted to .*queue", process_message)
+            match = re.search(
+                r"Job <([0-9]+)> is submitted to .*queue", process_message
+            )
             if match is None:
                 raise FailedSubmit(
                     f"Could not understand '{process_message}' from bsub"
diff --git a/src/ert/substitutions.py b/src/ert/substitutions.py
index bda5dc09983..5bcc3090391 100644
--- a/src/ert/substitutions.py
+++ b/src/ert/substitutions.py
@@ -9,7 +9,7 @@
 from pydantic_core import core_schema
 
 logger = logging.getLogger(__name__)
-_PATTERN = re.compile("<[^<>]+>")
+_PATTERN = re.compile(r"<[^<>]+>")
 
 
 from collections import UserDict
diff --git a/src/ert/validation/integer_argument.py b/src/ert/validation/integer_argument.py
index 9ed9d18f5f7..719a6b033fb 100644
--- a/src/ert/validation/integer_argument.py
+++ b/src/ert/validation/integer_argument.py
@@ -9,7 +9,7 @@ class IntegerArgument(ArgumentDefinition):
     NOT_INTEGER = "The argument must be an integer."
     NOT_IN_RANGE = "The argument is not in range: %s"
 
-    pattern = re.compile("^-?[0-9]+$")
+    pattern = re.compile(r"^-?[0-9]+$")
 
     def __init__(
         self,
diff --git a/tests/everest/test_data/mocked_test_case/jobs/well_order_mock.py b/tests/everest/test_data/mocked_test_case/jobs/well_order_mock.py
index 259fd7d8faf..a8f5b86f5da 100755
--- a/tests/everest/test_data/mocked_test_case/jobs/well_order_mock.py
+++ b/tests/everest/test_data/mocked_test_case/jobs/well_order_mock.py
@@ -11,7 +11,7 @@ def create_file(order, template_file, target_file):
         open(template_file, encoding="utf-8") as readH,
     ):
         for line in readH.readlines():
-            match_obj = re.search("(__[A-Z]+_[0-9]__)", line)
+            match_obj = re.search(r"(__[A-Z]+_[0-9]__)", line)
             if match_obj:
                 new_well = order.popitem(False)[0]
                 line = line.replace(match_obj.group(1), new_well)