diff --git a/.meta/requirements-test.txt b/.meta/requirements-test.txt
index 4fc41b89..5206b9a7 100644
--- a/.meta/requirements-test.txt
+++ b/.meta/requirements-test.txt
@@ -3,5 +3,5 @@ pytest
 pytest-asyncio
 pytest-cov
 pytest-timeout
-nbval
+git+https://github.com/casperdcl/nbval.git@master#egg=nbval
 ipywidgets
diff --git a/environment.yml b/environment.yml
index a8347fe7..6a174005 100644
--- a/environment.yml
+++ b/environment.yml
@@ -21,7 +21,6 @@ dependencies:
 - pytest-cov
 - pytest-timeout
 - pytest-asyncio
-- nbval
 - coverage
 # extras
 - dask               # dask
@@ -41,6 +40,7 @@ dependencies:
 - pygments
 - pymdown-extensions
 - pip:
+  - git+https://github.com/casperdcl/nbval.git@master#egg=nbval # tests (native)
   - py-make >=0.1.0                                          # `make/pymake`
   - mkdocs-minify-plugin                                     # `cd docs && pymake`
   - git+https://github.com/tqdm/jsmin@fix-pip#egg=jsmin      # `cd docs && pymake`
diff --git a/pyproject.toml b/pyproject.toml
index 5651e88e..30c4bce0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -84,7 +84,7 @@ classifiers = [
 dependencies = ['colorama; platform_system == "Windows"']
 
 [project.optional-dependencies]
-dev = ["pytest>=6", "pytest-cov", "pytest-timeout", "pytest-xdist"]
+dev = ["pytest>=6", "pytest-cov", "pytest-timeout", "pytest-asyncio", "nbval"]
 discord = ["requests"]
 slack = ["slack-sdk"]
 telegram = ["requests"]