diff --git a/CHANGELOG.md b/CHANGELOG.md
index a8daf10..d108722 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,15 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html)
 (pre-1.0: minor bumps may include breaking changes to the sim's behavior).
 
+## [0.20.5] - 2026-07-07
+
+### Docs
+- README: macOS note — the bundled `python3` is often 3.9 (below the 3.11
+  floor); install 3.11+ from python.org or Homebrew first. Verified fresh
+  installs from the public repo on macOS 13 / Intel / Python 3.14 (908 tests
+  green) in addition to Apple Silicon / Python 3.13; classifiers now list
+  Python 3.13/3.14.
+
 ## [0.20.4] - 2026-07-07
 
 ### Docs
diff --git a/README.md b/README.md
index 619397f..331f0ec 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,9 @@ the /31 point-to-point ISN addressing. See §5's `aci-sim graph` for how to gene
 
 **Platforms** — Linux (x86-64 & ARM: Raspberry Pi OS, Debian, Ubuntu — a
 Raspberry Pi 4 is enough) and macOS (Apple Silicon & Intel). Python 3.11+.
-The full test suite runs green on both. The default port mode runs anywhere
+The full test suite runs green on both (verified through Python 3.14, on
+Apple Silicon and Intel). Note macOS's bundled `python3` is often 3.9 —
+install 3.11+ from python.org or Homebrew first. The default port mode runs anywhere
 Python does; sandbox mode (real management IPs on `:443`) needs root and is
 Linux/macOS only. Windows is untested.
 
diff --git a/pyproject.toml b/pyproject.toml
index be165e3..42bfb11 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "aci-sim"
-version = "0.20.4"
+version = "0.20.5"
 description = "Faithful REST simulator of a 2-site Cisco ACI fabric (per-site APIC + ND/NDO)"
 readme = "README.md"
 license = "PolyForm-Noncommercial-1.0.0"
@@ -19,6 +19,8 @@ classifiers = [
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: System :: Networking",
     "Topic :: Software Development :: Testing",
     "Typing :: Typed",