We do not have this optional test dependency packaged yet.

--- pytest_benchmark-5.3.0/pyproject.toml.orig
+++ pytest_benchmark-5.3.0/pyproject.toml
@@ -72,7 +72,6 @@
 [dependency-groups]
 dev = [
     "freezegun>=1.5.5",
-    "nbmake>=1.5.5",
 ]
 
 [build-system]
--- pytest_benchmark-5.3.0/pytest.ini.orig
+++ pytest_benchmark-5.3.0/pytest.ini
@@ -25,7 +25,6 @@
     --ignore=src/pytest_benchmark/pep418.py
     --doctest-modules
     --doctest-glob=\*.rst
-    --nbmake
     --tb=short
 testpaths =
     tests