diff --git a/src/validation.rs b/src/validation.rs
index 2ccf7dc..2f19ab0 100644
--- a/src/validation.rs
+++ b/src/validation.rs
@@ -222,8 +222,8 @@ impl Validate for Image {
         if let Some(height) = self.height() {
             let height = height.parse::<i64>()?;
             validate!(
-                (0..=400).contains(&height),
-                "Image height is not between 0 and 400"
+                (0..=144).contains(&height),
+                "Image height is not between 0 and 144"
             );
         }
 
diff --git a/tests/validation.rs b/tests/validation.rs
deleted file mode 100644
index b68e360..0000000
--- a/tests/validation.rs
+++ /dev/null
@@ -1,42 +0,0 @@
-#![cfg(feature = "validation")]
-
-use rss::validation::Validate;
-use rss::ImageBuilder;
-
-fn image_with_height(height: &str) -> rss::Image {
-    ImageBuilder::default()
-        .url("https://example.com/image.png".to_string())
-        .link("https://example.com/".to_string())
-        .title("title".to_string())
-        .height(height.to_string())
-        .build()
-}
-
-fn image_with_width(width: &str) -> rss::Image {
-    ImageBuilder::default()
-        .url("https://example.com/image.png".to_string())
-        .link("https://example.com/".to_string())
-        .title("title".to_string())
-        .width(width.to_string())
-        .build()
-}
-
-#[test]
-fn image_height_allows_up_to_400() {
-    // The RSS 2.0 specification sets the maximum image height to 400.
-    assert!(image_with_height("31").validate().is_ok());
-    assert!(image_with_height("200").validate().is_ok());
-    assert!(image_with_height("400").validate().is_ok());
-}
-
-#[test]
-fn image_height_above_400_is_invalid() {
-    assert!(image_with_height("401").validate().is_err());
-}
-
-#[test]
-fn image_width_max_is_still_144() {
-    // Width keeps its specification maximum of 144.
-    assert!(image_with_width("144").validate().is_ok());
-    assert!(image_with_width("145").validate().is_err());
-}