diff --git a/.nvmrc b/.nvmrc
index 87834047..1dda03dd 100644
--- a/.nvmrc
+++ b/.nvmrc
@@ -1 +1 @@
-20.12.2
+26.13.0
diff --git a/.python-version b/.python-version
index 8531a3b7..861845e4 100644
--- a/.python-version
+++ b/.python-version
@@ -1 +1 @@
-3.12.2
+3.15.2
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 995b4c94..568b846a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Other changes
 - Fixed "Using parts of SuperDiff directly" documentation. [#313](https://github.com/splitwise/super_diff/pull/313)
 - Allow diff-lcs 2. [#317](https://github.com/splitwise/super_diff/pull/317) by [@andrewfader](https://github.com/andrewfader)
+- Upgrade development Node and Python. [#320](https://github.com/splitwise/super_diff/pull/320)
 
 ## 0.19.0 - 2026-05-01