diff --git a/.devcontainer/compose.yml b/.devcontainer/compose.yml
index 68729a7..895fcc1 100644
--- a/.devcontainer/compose.yml
+++ b/.devcontainer/compose.yml
@@ -7,7 +7,7 @@ services:
         # Elixir Version: 1.9, 1.10, 1.10.4, ...
         VARIANT: '1.18.3'
         # Phoenix Version: 1.4.17, 1.5.4, ...
-        PHOENIX_VERSION: '1.7.19'
+        PHOENIX_VERSION: '1.7.21'
         # Node Version: 12, 14, ...
         # NODE_VERSION: "16"