diff --git a/control_plane/src/endpoint.rs b/control_plane/src/endpoint.rs
index 3b033b32fd..c49e1efb0c 100644
--- a/control_plane/src/endpoint.rs
+++ b/control_plane/src/endpoint.rs
@@ -307,6 +307,9 @@ impl Endpoint {
         // Load the 'neon' extension
         conf.append("shared_preload_libraries", "neon");
 
+		// It is only for testing, in real environment this GUC is passed by control plane
+		conf.append("neon.primary_is_running", "on");
+
         conf.append_line("");
         // Replication-related configurations, such as WAL sending
         match &self.mode {
diff --git a/pgxn/neon/neon.c b/pgxn/neon/neon.c
index b930fdb3ca..b115e641e1 100644
--- a/pgxn/neon/neon.c
+++ b/pgxn/neon/neon.c
@@ -30,6 +30,8 @@
 PG_MODULE_MAGIC;
 void		_PG_init(void);
 
+bool primary_is_running = false;
+
 void
 _PG_init(void)
 {
@@ -48,6 +50,16 @@ _PG_init(void)
 
 	pg_init_extension_server();
 
+	DefineCustomBoolVariable(
+		"neon.primary_is_running",
+		"For replica it is true, if primary is running, false otherwise",
+		NULL,
+		&primary_is_running,
+		false,
+		PGC_POSTMASTER,
+		0,
+		NULL, NULL, NULL);
+
 	/*
 	 * Important: This must happen after other parts of the extension are
 	 * loaded, otherwise any settings to GUCs that were set before the
diff --git a/vendor/postgres-v14 b/vendor/postgres-v14
index 23a19fe0a4..7eb44da047 160000
--- a/vendor/postgres-v14
+++ b/vendor/postgres-v14
@@ -1 +1 @@
-Subproject commit 23a19fe0a4f6e56f4540afabe6825281c9d02cd1
+Subproject commit 7eb44da047e68cf6785d27388c482abd02fe2a2d
diff --git a/vendor/postgres-v15 b/vendor/postgres-v15
index d4d552ce42..e2a0a8aa75 160000
--- a/vendor/postgres-v15
+++ b/vendor/postgres-v15
@@ -1 +1 @@
-Subproject commit d4d552ce42e40f29909f1c6613c57ecda6ea6933
+Subproject commit e2a0a8aa75ff2fa70af87cb86ba6fb7f575e3155
diff --git a/vendor/postgres-v16 b/vendor/postgres-v16
index 0d4eb408a1..3f96a5b0c7 160000
--- a/vendor/postgres-v16
+++ b/vendor/postgres-v16
@@ -1 +1 @@
-Subproject commit 0d4eb408a1242f8564ba2bfa57a1ea601dc99a4c
+Subproject commit 3f96a5b0c70e48b9142f0c9b496c7c04c93bec8b
diff --git a/vendor/revisions.json b/vendor/revisions.json
index 37457e56ee..c862888bc9 100644
--- a/vendor/revisions.json
+++ b/vendor/revisions.json
@@ -1,5 +1,5 @@
 {
-    "postgres-v16": "0d4eb408a1242f8564ba2bfa57a1ea601dc99a4c",
-    "postgres-v15": "d4d552ce42e40f29909f1c6613c57ecda6ea6933",
-    "postgres-v14": "23a19fe0a4f6e56f4540afabe6825281c9d02cd1"
+    "postgres-v16": "3f96a5b0c70e48b9142f0c9b496c7c04c93bec8b",
+    "postgres-v15": "e2a0a8aa75ff2fa70af87cb86ba6fb7f575e3155",
+    "postgres-v14": "7eb44da047e68cf6785d27388c482abd02fe2a2d"
 }