diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index dd99752..f398f1b 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -146,6 +146,7 @@ jobs:
           activate-environment: makim
           auto-update-conda: true
           conda-solver: libmamba
+          python-version: "3.9"
 
       - name: Install dependencies
         run: |
diff --git a/pyproject.toml b/pyproject.toml
index 9249ffe..a22e3f6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -67,7 +67,7 @@ testpaths = [
 ]
 
 [tool.mypy]
-python_version = "3.8"
+python_version = "3.9"
 check_untyped_defs = true
 strict = true
 ignore_missing_imports = true