diff --git a/.gitignore b/.gitignore
index 88259f56..04f57d47 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,3 +31,4 @@ yarn-error.log
 /docker/caddy/certs/*.pem
 /docker/caddy/certs/*-key.pem
 .claude/settings.local.json
+.php-version
diff --git a/.php-version b/.php-version
new file mode 100644
index 00000000..946e7ebf
--- /dev/null
+++ b/.php-version
@@ -0,0 +1 @@
+8.4.17