diff --git a/.gitmodules b/.gitmodules
index 3ee79397..fc42715e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,4 +1,4 @@
 [submodule "mongo-php-library"]
 	path = mongo-php-library
 	url = https://github.com/mongodb/mongo-php-library.git
-	branch = master
+	branch = v1.18
diff --git a/mongo-php-library b/mongo-php-library
index d2f37660..d421c418 160000
--- a/mongo-php-library
+++ b/mongo-php-library
@@ -1 +1 @@
-Subproject commit d2f376602411dd2288242c6b8c52d0eccdbd9d69
+Subproject commit d421c418ef56a96f3dfa6b2828f936df6848ccf9