diff --git a/pyproject.toml b/pyproject.toml
index bcbdca46..330b5fa0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -158,12 +158,6 @@ convention = "numpy"
 
 [tool.pytest.ini_options]
 testpaths = ["src", "tests"]
-markers = [
-    "wip: Tests that are work-in-progress.",
-    "unit: Flag for unit tests which target mainly a single function.",
-    "integration: Flag for integration tests which may comprise of multiple unit tests.",
-    "end_to_end: Flag for tests that cover the whole program.",
-]
 filterwarnings = [
     "ignore:'@pytask.mark.*. is deprecated:FutureWarning",
     "ignore:The --rsyncdir command line argument:DeprecationWarning",