diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 921eadd..a13b931 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.10', '3.11', '3.12']
 
     env:
       OBSERVATORY: LCO
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 982e53d..13d15a6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Next version
 
+### 🔥 Breaking changes
+
+* Dropped support for Python 3.9.
+
 ### ✨ Improved
 
 * Bumped `archon` to 0.14.0.