diff --git a/src/util/config_reader.c b/src/util/config_reader.c
index 09b6841..1c8ec79 100644
--- a/src/util/config_reader.c
+++ b/src/util/config_reader.c
@@ -417,8 +417,8 @@ int validate_tx_config(const struct dvledtx_config* config) {
         LOG_ERROR("video width/height must be non-zero");
         return -1;
     }
-    if (config->width > 1920 || config->height > 1080) {
-        LOG_ERROR("video resolution %dx%d exceeds maximum 1920x1080",
+    if (config->width > 3840 || config->height > 2160) {
+        LOG_ERROR("video resolution %dx%d exceeds maximum 3840x2160",
                config->width, config->height);
         return -1;
     }
diff --git a/tests/test_config_reader.c b/tests/test_config_reader.c
index 8bea230..901d612 100644
--- a/tests/test_config_reader.c
+++ b/tests/test_config_reader.c
@@ -602,7 +602,7 @@ static void test_validate_resolution_exceeds_max_fails(void **state)
     (void)state;
     struct dvledtx_config cfg;
     fill_valid_config(&cfg);
-    cfg.width = 2000; /* > 1920 limit */
+    cfg.width = 4000; /* > 3840 limit */
     assert_int_equal(validate_tx_config(&cfg), -1);
 }