diff --git a/pyproject.toml b/pyproject.toml
index 330964bd87..b16217ca54 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -300,6 +300,11 @@ exclude = [
     ]
 
 [tool.ruff.lint]
+# Enable preview rules...
+preview = true
+# ... but enable them manually for now.
+explicit-preview-rules = true
+
 select = [
     "F",  # pyflakes
     "E",  # pycodestyle error
diff --git a/tests/unit/test_utils.py b/tests/unit/test_utils.py
index 97252433d2..fef46dcc59 100644
--- a/tests/unit/test_utils.py
+++ b/tests/unit/test_utils.py
@@ -1013,7 +1013,7 @@ def test_not_in_repository(
             cls,
             nested_file: tuple[Path, Path, Path],
             root_logger):
-        top_dir, sub_dir, file = nested_file
+        _, sub_dir, _ = nested_file
 
         with pytest.raises(GeneralError, match=r"Failed to add path .* to git index."):
             git_add(path=sub_dir, logger=root_logger)
@@ -1023,7 +1023,7 @@ def test_in_repository(
             cls,
             nested_file: tuple[Path, Path, Path],
             root_logger):
-        top_dir, sub_dir, file = nested_file
+        top_dir, sub_dir, _ = nested_file
         run(ShellScript('git init').to_shell_command(), cwd=top_dir)
 
         git_add(path=sub_dir, logger=root_logger)
diff --git a/tmt/options.py b/tmt/options.py
index 98de58e90b..9dc4cf533b 100644
--- a/tmt/options.py
+++ b/tmt/options.py
@@ -54,7 +54,7 @@ def rendered(self) -> str:
 class Path(click.ParamType):
     name = 'path'
 
-    def convert(
+    def convert(  # noqa: RET503
         self,
         value: Any,
         param: Optional[click.Parameter],
@@ -100,8 +100,7 @@ def convert(
                 ctx=ctx,
             )
 
-        # RET503: ruff does not recognize NoReturn annotation of `self.fail`.
-        self.fail(  # noqa: RET503
+        self.fail(
             f"Field '{param.name}' must be a path-like string, '{type(value).__name__}' found.",
             param=param,
             ctx=ctx,
diff --git a/tmt/steps/provision/mrack.py b/tmt/steps/provision/mrack.py
index 3f0b1ad523..1cc9f5c254 100644
--- a/tmt/steps/provision/mrack.py
+++ b/tmt/steps/provision/mrack.py
@@ -238,9 +238,7 @@ def _transform_unsupported(
 def _transform_beaker_pool(
     constraint: tmt.hardware.TextConstraint, logger: tmt.log.Logger
 ) -> MrackBaseHWElement:
-    beaker_operator, actual_value, negate = operator_to_beaker_op(
-        constraint.operator, constraint.value
-    )
+    beaker_operator, actual_value, _ = operator_to_beaker_op(constraint.operator, constraint.value)
 
     return MrackHWBinOp('pool', beaker_operator, actual_value)
 
@@ -464,9 +462,7 @@ def _transform_memory(
 def _transform_tpm_version(
     constraint: tmt.hardware.TextConstraint, logger: tmt.log.Logger
 ) -> MrackBaseHWElement:
-    beaker_operator, actual_value, negate = operator_to_beaker_op(
-        constraint.operator, constraint.value
-    )
+    beaker_operator, actual_value, _ = operator_to_beaker_op(constraint.operator, constraint.value)
 
     return MrackHWKeyValue('TPM', beaker_operator, actual_value)
 
@@ -474,10 +470,6 @@ def _transform_tpm_version(
 def _transform_virtualization_is_virtualized(
     constraint: tmt.hardware.FlagConstraint, logger: tmt.log.Logger
 ) -> MrackBaseHWElement:
-    beaker_operator, actual_value, _ = operator_to_beaker_op(
-        constraint.operator, str(constraint.value)
-    )
-
     test = (constraint.operator, constraint.value)
 
     if test in [(tmt.hardware.Operator.EQ, True), (tmt.hardware.Operator.NEQ, False)]:
diff --git a/tmt/steps/report/reportportal.py b/tmt/steps/report/reportportal.py
index a78219b06a..cabb433aa5 100644
--- a/tmt/steps/report/reportportal.py
+++ b/tmt/steps/report/reportportal.py
@@ -492,7 +492,7 @@ def execute_rp_import(self) -> None:
             # The datetime *strings* are in fact sorted here, but finding the minimum will work,
             # because the datetime in ISO format is designed to be lexicographically sortable.
             launch_time = min(
-                [r.start_time or self.datetime for r in self.step.plan.execute.results()]
+                r.start_time or self.datetime for r in self.step.plan.execute.results()
             )
 
         # Create launch, suites (if "--suite_per_plan") and tests;