diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ffad941..04e7fa4 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -6,7 +6,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python: ['3.8', '3.9', '3.10']
+        python: ['3.9', '3.10', '3.11']
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
diff --git a/pyproject.toml b/pyproject.toml
index 52b240b..a06e0e8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ repository = "https://github.com/statnett/linerate.git"
 readme = "README.md"
 
 [tool.poetry.dependencies]
-python = ">=3.8.1,<4.0"
+python = ">=3.9,<4.0"
 numpy = "*"
 scipy = "*"
 numba = ">=0.56.4"
@@ -33,7 +33,7 @@ optional = true
 sphinx = "^5.2.3"
 sphinxcontrib-bibtex = "^2.5.0"
 sphinx-gallery = "^0.15.0"
-pydata-sphinx-theme = "^0.11.0"
+pydata-sphinx-theme = "^0.15.0"
 pillow = "^9.2.0"
 matplotlib = "^3.6.0"