diff --git a/README.md b/README.md
index 100b9e95..a3a74bec 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ operations.
 `repmgr 4` is a complete rewrite of the existing `repmgr` codebase.
 
 
-Supports PostgreSQL 9.6 and later; support for 9.3 will be dropped, 9.4/9.5
+Supports PostgreSQL 9.6 and later; support for 9.3 has been dropped, 9.4/9.5
 may be supported if feasible.
 
 Building from source
diff --git a/repmgr-action-standby.c b/repmgr-action-standby.c
index 7d933d69..3937adce 100644
--- a/repmgr-action-standby.c
+++ b/repmgr-action-standby.c
@@ -1628,21 +1628,6 @@ check_source_server()
 	log_detail(_("current installation size is %s"),
 			   cluster_size);
 
-	/*
-	 * If --recovery-min-apply-delay was passed, check that
-	 * we're connected to PostgreSQL 9.4 or later
-	 */
-	// XXX should this be a config file parameter?
-	if (*runtime_options.recovery_min_apply_delay)
-	{
-		if (server_version_num < 90400)
-		{
-			log_error(_("PostgreSQL 9.4 or greater required for --recovery-min-apply-delay"));
-			PQfinish(source_conn);
-			exit(ERR_BAD_CONFIG);
-		}
-	}
-
 	/*
 	 * If the upstream node is a standby, try to connect to the primary too so we
 	 * can write an event record
@@ -1916,13 +1901,6 @@ initialise_direct_clone(void)
 	{
 		TablespaceListCell *cell;
 
-		if (server_version_num < 90400)
-		{
-			log_error(_("tablespace mapping is not supported for PostgreSQL 9.3"));
-			PQfinish(source_conn);
-			exit(ERR_BAD_CONFIG);
-		}
-
 		for (cell = config_file_options.tablespace_mapping.head; cell; cell = cell->next)
 		{
 			char *old_dir_escaped     = escape_string(source_conn, cell->old_dir);
diff --git a/repmgr-client.c b/repmgr-client.c
index e98c5751..9dca006f 100644
--- a/repmgr-client.c
+++ b/repmgr-client.c
@@ -1649,12 +1649,6 @@ check_upstream_config(PGconn *conn, int server_version_num, bool exit_on_error)
 		xlog_stream = false;
 
 	/* Check that WAL level is set correctly */
-	if (server_version_num < 90400)
-	{
-		i = guc_set(conn, "wal_level", "=", "hot_standby");
-		wal_error_message = _("parameter 'wal_level' must be set to 'hot_standby'");
-	}
-	else
 	{
 		char *levels_pre96[] = {
 			"hot_standby",
@@ -1700,8 +1694,9 @@ check_upstream_config(PGconn *conn, int server_version_num, bool exit_on_error)
 	if (i == 0 || i == -1)
 	{
 		if (i == 0)
-			log_error("%s",
-					  wal_error_message);
+		{
+			log_error("%s", wal_error_message);
+		}
 
 		if (exit_on_error == true)
 		{
@@ -1714,41 +1709,23 @@ check_upstream_config(PGconn *conn, int server_version_num, bool exit_on_error)
 
 	if (config_file_options.use_replication_slots)
 	{
-		/* Does the server support physical replication slots? */
-		if (server_version_num < 90400)
+		i = guc_set_typed(conn, "max_replication_slots", ">",
+						  "0", "integer");
+		if (i == 0 || i == -1)
 		{
-			log_error(_("server version must be 9.4 or later to enable replication slots"));
-
-			if (exit_on_error == true)
+			if (i == 0)
 			{
-				PQfinish(conn);
-				exit(ERR_BAD_CONFIG);
-			}
-
-			config_ok = false;
-		}
-		/* Server is 9.4 or greater - non-zero `max_replication_slots` required */
-		else
-		{
-			i = guc_set_typed(conn, "max_replication_slots", ">",
-							  "0", "integer");
-			if (i == 0 || i == -1)
-			{
-				if (i == 0)
+				log_error(_("parameter \"max_replication_slots\" must be set to at least 1 to enable replication slots"));
+				log_hint(_("\"max_replication_slots\" should be set to at least the number of expected standbys"));
+				if (exit_on_error == true)
 				{
-					log_error(_("parameter 'max_replication_slots' must be set to at least 1 to enable replication slots"));
-					log_hint(_("'max_replication_slots' should be set to at least the number of expected standbys"));
-					if (exit_on_error == true)
-					{
-						PQfinish(conn);
-						exit(ERR_BAD_CONFIG);
-					}
-
-					config_ok = false;
+					PQfinish(conn);
+					exit(ERR_BAD_CONFIG);
 				}
+
+				config_ok = false;
 			}
 		}
-
 	}
 	/*
 	 * physical replication slots not available or not requested - check if
@@ -1856,7 +1833,9 @@ check_upstream_config(PGconn *conn, int server_version_num, bool exit_on_error)
 	if (i == 0 || i == -1)
 	{
 		if (i == 0)
+		{
 			log_error(_("parameter 'hot_standby' must be set to 'on'"));
+		}
 
 		if (exit_on_error == true)
 		{
diff --git a/repmgr.h b/repmgr.h
index 272d88d1..1b143bbd 100644
--- a/repmgr.h
+++ b/repmgr.h
@@ -19,8 +19,8 @@
 #include "dbutils.h"
 #include "log.h"
 
-#define MIN_SUPPORTED_VERSION		"9.3"
-#define MIN_SUPPORTED_VERSION_NUM	90300
+#define MIN_SUPPORTED_VERSION		"9.4"
+#define MIN_SUPPORTED_VERSION_NUM	90400
 #define UNKNOWN_SERVER_VERSION_NUM -1
 
 #define NODE_NOT_FOUND		-1