diff --git a/gapic/packaging/dependencies.yaml b/gapic/packaging/dependencies.yaml
index 3cb2b8d7..489cdd2a 100644
--- a/gapic/packaging/dependencies.yaml
+++ b/gapic/packaging/dependencies.yaml
@@ -45,7 +45,7 @@ gax_version:
   nodejs:
     lower: '0.13.2'
   php:
-    lower: '0.20.0'
+    lower: '0.23.0'
   ruby:
     lower: '0.8.6'
   java: