diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 002e6e41de6..321bb7f3c97 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         python-version: ['3.12']
-        tmux-version: ['2.6', '2.7', '2.8', '3.0a', '3.1b', '3.2a', '3.3a', 'master']
+        tmux-version: ['2.6', '2.7', '2.8', '3.0a', '3.1b', '3.2a', '3.3a', '3.4', 'master']
         # balance ci coverage across supported python/tmux versions with CI speed
         include:
           - python-version: '3.8'
diff --git a/CHANGES b/CHANGES
index 0530608c6a4..6eb74cccc5a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -19,6 +19,10 @@ $ pipx install --suffix=@next 'tmuxp' --pip-args '\--pre' --force
 
 <!-- Maintainers, insert changes / features for the next release here -->
 
+### Tests
+
+- CI: Add tmux 3.4 to test matrix (#909)
+
 ## tmuxp 1.36.0 (2024-02-07)
 
 _Maintenance only, no bug fixes or new features_