diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 84ba9b8..d1c7247 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: ['3.5.10', '3.6.15', '3.7.17', '3.8.18', '3.9.23', '3.10.18', '3.11', '3.12', '3.13']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
diff --git a/pyproject.toml b/pyproject.toml
index 290edb6..24465d3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ readme = "README.md"
 packages = [{ include = "rbool", from = "src" }]
 
 [tool.poetry.dependencies]
-python = "^3.9"
+python = "^3.5"
 
 [tool.poetry.dev-dependencies]
 pytest = "^5.2"
diff --git a/tox.ini b/tox.ini
index aec88cd..e9ab7b2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,10 +24,6 @@ commands =
 
 [gh-actions]
 python =
-    3.5: py35
-    3.6: py36
-    3.7: py37
-    3.8: py38
     3.9: py39, coverage
     3.10: py310
     3.11: py311