diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 218b56889..12133f830 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         python-version: ['3.8', '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']
     steps:
       - uses: actions/checkout@v4
 
diff --git a/CHANGES b/CHANGES
index 4dc7d3853..0e62e4d08 100644
--- a/CHANGES
+++ b/CHANGES
@@ -22,6 +22,7 @@ $ pip install --user --upgrade --pre libtmux
 ### Tests
 
 - pytest: Fix `usefixture` warning (#519)
+- ci: Add tmux 3.4 to test matrix (#909)
 
 ## libtmux 0.27.1 (2024-02-07)