diff --git a/.github/workflows/ci-linux-ubuntu.yml b/.github/workflows/ci-linux-ubuntu.yml
index b5e1662..62b2900 100644
--- a/.github/workflows/ci-linux-ubuntu.yml
+++ b/.github/workflows/ci-linux-ubuntu.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
     - uses: actions/checkout@v3
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 341b0ea..a17bf96 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ please take a look at related PRs and issues and see if the change affects you.
 
 ## [Unreleased]
 
+- Added support for Python 3.13 and relax restriction on upper Python version.
 - Fix parsing of regex rules in peg and cleanpeg syntaxes ([#125]). Thanks
   @smurfix for reporting ([#123]).
 - **(BIC)** Removed support for Python 3.6. The minimal supported version is 3.7.
diff --git a/pyproject.toml b/pyproject.toml
index c6eae41..8ec823a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ authors = [
 readme = "README.md"
 license = {text = "MIT"}
 keywords = ["parser", "PEG", "packrat", "library", "interpreter"]
-requires-python = ">=3.7, <3.13"
+requires-python = ">=3.7"
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
@@ -26,6 +26,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
 ]
 
 [project.urls]