diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 03444845..6a98a9c3 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -73,6 +73,7 @@ jobs:
       - name: Build distribution and test installation
         shell: bash
         run: |
+          nox -s build
           nox -s test_wheel-${{ matrix.python-version }} --verbose
           nox -s test_sdist-${{ matrix.python-version }} --verbose
 
diff --git a/noxfile.py b/noxfile.py
index e99ad6a1..b2a9a602 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -3,7 +3,7 @@
 import nox
 
 
-@nox.session(python="3.11", reuse_venv=True)
+@nox.session(venv_backend="mamba|conda", python="3.11", reuse_venv=True)
 def dev(session):
     session.conda_install("graphviz", channel="conda-forge")
     session.install("-r", "requirements/dev.txt")
@@ -33,37 +33,39 @@ def tests(session):
     session.run("pytest", "-vv")
 
 
+@nox.session(venv_backend="uv|virtualenv", reuse_venv=True)
+def build(session):
+    session.install("build")
+    session.run("python", "-m", "build")
+
+
 @nox.session(
-    venv_backend="uv|virtualenv",
+    venv_backend="mamba|conda",
     python=["3.8", "3.9", "3.10", "3.11", "3.12"],
     reuse_venv=False,
 )
 def test_wheel(session):
-    session.install("build")
-    session.run("python", "-m", "build")
+    session.conda_install("graphviz", channel="conda-forge")
     wheel_path = next(Path("dist").glob("*.whl"))
     session.install(f"erdantic@file://{wheel_path}")
     session.run("erdantic", "--version")
 
 
 @nox.session(
-    venv_backend="uv|virtualenv",
+    venv_backend="mamba|conda",
     python=["3.8", "3.9", "3.10", "3.11", "3.12"],
     reuse_venv=False,
 )
 def test_sdist(session):
-    session.install("build")
-    session.run("python", "-m", "build")
+    session.conda_install("graphviz", channel="conda-forge")
+
     sdist_path = next(Path("dist").glob("*.tar.gz"))
     session.install(f"erdantic@file://{sdist_path}")
     session.run("erdantic", "--version")
 
 
-@nox.session(
-    venv_backend="uv|virtualenv",
-    python="3.11",
-    reuse_venv=True,
-)
+@nox.session(venv_backend="mamba|conda", python="3.11", reuse_venv=True)
 def docs(session):
+    session.conda_install("graphviz", channel="conda-forge")
     session.install("-r", "requirements/docs.txt")
     session.run("make", "docs")