diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 59ae727..98a662d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -13,12 +13,11 @@ jobs:
     strategy:
       matrix:
         python-version:
-        - '3.8'
         - '3.9'
         - '3.10'
         - '3.11'
         - '3.12'
-        - 'pypy-3.8'
+        - '3.13'
         - 'pypy-3.9'
         - 'pypy-3.10'
         # this version range needs to be synchronized with the one in pyproject.toml
diff --git a/pyproject.toml b/pyproject.toml
index 45abf91..6ed28ef 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ description = "Industry standard I/O for Amaranth HDL"
 authors = [{name = "Amaranth HDL contributors"}]
 license = {file = "LICENSE.txt"}
 
-requires-python = "~=3.8"
+requires-python = "~=3.9"
 dependencies = [
   # this version requirement needs to be synchronized with the one in .github/workflows/main.yml
   "amaranth>=0.5,<0.6",