diff --git a/meson.build b/meson.build
index 029aea46..49392126 100644
--- a/meson.build
+++ b/meson.build
@@ -18,7 +18,7 @@ datadir = get_option('datadir')
 sysconfdir = get_option('sysconfdir')
 prefix = get_option('prefix')
 
-jsonc          = dependency('json-c', version: '>=0.12.1')
+jsonc          = dependency('json-c', version: '>=0.13')
 pcre           = dependency('libpcre')
 wlroots        = dependency('wlroots')
 wayland_server = dependency('wayland-server')
diff --git a/swaymsg/main.c b/swaymsg/main.c
index 8a720fca..a34eced4 100644
--- a/swaymsg/main.c
+++ b/swaymsg/main.c
@@ -156,7 +156,7 @@ static void pretty_print_version(json_object *v) {
 static void pretty_print_clipboard(json_object *v) {
 	if (success(v, true)) {
 		if (json_object_is_type(v, json_type_array)) {
-			for (int i = 0; i < json_object_array_length(v); ++i) {
+			for (size_t i = 0; i < json_object_array_length(v); ++i) {
 				json_object *o = json_object_array_get_idx(v, i);
 				printf("%s\n", json_object_get_string(o));
 			}