diff --git a/Cargo.toml b/Cargo.toml
index 7dd1af4..9126d9d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,14 +16,14 @@ opener = "^0.7"
 anyhow = "^1.0"
 
 #arrow = {version = "0.13.0", optional = true} # nightly
-image = {version = "^0.23", optional = true}
-nalgebra = {version = "^0.26", optional = true}
-num-traits = {version = "^0.2", optional = true}
-ndarray = {version = "^0.15", optional = true}
+image = { version = "^0.25", optional = true }
+nalgebra = { version = "^0.33", optional = true }
+num-traits = { version = "^0.2", optional = true }
+ndarray = { version = "^0.16", optional = true }
 
 [dev-dependencies]
-mime = "0.3.14"
-nalgebra = "0.26.1"
+mime = "0.3"
+nalgebra = "0.33"
 
 [features]
 default = []
@@ -31,3 +31,7 @@ all = ["show_nalgebra", "show_ndarray", "show_image"]
 show_nalgebra = ["nalgebra", "num-traits"]
 show_ndarray = ["ndarray"]
 show_image = ["image"]
+
+[[example]]
+name = "sample_nalgebra"
+required-features = ["nalgebra"]
diff --git a/src/show_image.rs b/src/show_image.rs
index 6209ca6..9ba628e 100644
--- a/src/show_image.rs
+++ b/src/show_image.rs
@@ -14,6 +14,9 @@ use crate::Showable;
 use anyhow::{anyhow, Error};
 use base64::prelude::*;
 use image;
+use image::EncodableLayout;
+use image::PixelWithColorType;
+use std::io::Cursor;
 use std::ops::Deref;
 
 impl Showable for image::DynamicImage {
@@ -34,17 +37,14 @@ impl Showable for image::DynamicImage {
 
 impl<P, Container> Showable for image::ImageBuffer<P, Container>
 where
-    P: image::Pixel<Subpixel = u8> + 'static,
-    Container: Deref<Target = [u8]>,
+    P: PixelWithColorType,
+    [P::Subpixel]: EncodableLayout,
+    Container: Deref<Target = [P::Subpixel]>,
 {
     fn to_content_info(&self) -> Result<ContentInfo, Error> {
-        let mut buffer = Vec::new();
-        image::png::PngEncoder::new(&mut buffer).encode(
-            self,
-            self.width(),
-            self.height(),
-            <P as image::Pixel>::COLOR_TYPE,
-        )?;
+        let mut buffer: Vec<u8> = Vec::new();
+        self.write_to(&mut Cursor::new(&mut buffer), image::ImageFormat::Png)?;
+
         Ok(ContentInfo {
             content: BASE64_STANDARD.encode(&buffer),
             mime_type: "image/png;base64".into(),
@@ -89,7 +89,7 @@ mod tests {
 
     #[test]
     fn test_show_gen_image() {
-        let img = image::ImageBuffer::from_fn(256, 256, |x, y| {
+        let img = image::RgbImage::from_fn(256, 256, |x, y| {
             if (x as i32 - y as i32).abs() < 3 {
                 image::Rgb([0, 0, 255])
             } else {
diff --git a/src/show_ndarray.rs b/src/show_ndarray.rs
index eea43c5..d41c6f1 100644
--- a/src/show_ndarray.rs
+++ b/src/show_ndarray.rs
@@ -34,7 +34,7 @@ where
             html.push_str(&format!("<th>{}</th>", c));
         }
         html.push_str("</tr>");
-        for (r, row) in v.genrows().into_iter().enumerate() {
+        for (r, row) in v.rows().into_iter().enumerate() {
             html.push_str("<tr>");
             html.push_str(&format!("<th>{}</th>", r));
             for v in row.iter() {