diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 42228a9..8cebca0 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -36,7 +36,7 @@ jobs:
           auto-update-conda: false
           python-version: ${{ matrix.python-version }}
           channels: conda-forge,nodefaults
-          mamba-version: "*"
+          miniforge-variant: Mambaforge
 
       - name: Install core dependencies.
         shell: bash -l {0}
diff --git a/tests/test_execute.py b/tests/test_execute.py
index 2bc68cf..6662c52 100644
--- a/tests/test_execute.py
+++ b/tests/test_execute.py
@@ -261,13 +261,6 @@ def task_run_jl_script():
     reason="Test folder and repo are on different drives causing relpath to fail.",
 )
 @parametrize_parse_code_serializer_suffix
-@pytest.mark.parametrize(
-    ("config_path", "value"),
-    [
-        ("pytask.ini", "[pytask]\njulia_project={}"),
-        ("pyproject.toml", "[tool.pytask.ini_options]\njulia_project='{}'"),
-    ],
-)
 @pytest.mark.parametrize("path", [ROOT, "relative_from_config"])
 def test_run_jl_script_w_environment_in_config(
     runner,
@@ -275,8 +268,6 @@ def test_run_jl_script_w_environment_in_config(
     parse_config_code,
     serializer,
     suffix,
-    config_path,
-    value,
     path,
 ):
     task_source = f"""
@@ -307,7 +298,9 @@ def task_run_jl_script():
         if isinstance(path, Path)
         else Path(os.path.relpath(ROOT, tmp_path)).as_posix()
     )
-    tmp_path.joinpath(config_path).write_text(value.format(path_in_config))
+    tmp_path.joinpath("pyproject.toml").write_text(
+        f"[tool.pytask.ini_options]\njulia_project='{path_in_config}'"
+    )
 
     result = runner.invoke(cli, [tmp_path.as_posix()])