diff --git a/src/Core_Command.php b/src/Core_Command.php
index 8387f4de..2410d7e5 100644
--- a/src/Core_Command.php
+++ b/src/Core_Command.php
@@ -926,7 +926,7 @@ private static function get_wp_details( $abspath = ABSPATH ) {
 			);
 		}
 
-		$version_content = file_get_contents( $versions_path, null, null, 6, 2048 );
+		$version_content = file_get_contents( $versions_path, false, null, 6, 2048 );
 
 		$vars   = [ 'wp_version', 'wp_db_version', 'tinymce_version', 'wp_local_package' ];
 		$result = [];
@@ -988,7 +988,7 @@ private static function find_var( $var_name, $code ) {
 	 * @return string|array String message on failure. An array of checksums on success.
 	 */
 	private static function get_core_checksums( $version, $locale, $insecure ) {
-		$query = http_build_query( compact( 'version', 'locale' ), null, '&' );
+		$query = http_build_query( compact( 'version', 'locale' ), '', '&' );
 		$url   = "https://api.wordpress.org/core/checksums/1.0/?{$query}";
 
 		$headers = [ 'Accept' => 'application/json' ];