diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 5b2a112..9775fe0 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -23,6 +23,7 @@ jobs:
     strategy:
       matrix:
         target: [x86_64, x86, aarch64, armv7, s390x, ppc64le]
+        python_version: ['3.10', 'pypy-3.7', 'pypy-3.8', 'pypy-3.9', 'pypy-3.10']
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e69de29..7c719d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -0,0 +1,9 @@
+# Changelog
+
+All notable changes to wassima will be documented in this file. This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## 1.0.0 (2023-09-20)
+
+### Added
+- Public functions `root_der_certificates`, `root_pem_certificates`, `generate_ca_bundle`, and `create_default_ssl_context`.