diff --git a/Cargo.lock b/Cargo.lock
index 0517212c3..63fd1dfd9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1058,12 +1058,11 @@ dependencies = [
 
 [[package]]
 name = "deflate"
-version = "0.8.6"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "73770f8e1fe7d64df17ca66ad28994a0a623ea497fa69486e14984e715c5d174"
+checksum = "c86f7e25f518f4b81808a2cf1c50996a61f5c2eb394b2393bd87f2a4780a432f"
 dependencies = [
  "adler32",
- "byteorder",
 ]
 
 [[package]]
@@ -1947,9 +1946,9 @@ dependencies = [
 
 [[package]]
 name = "image"
-version = "0.23.14"
+version = "0.24.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "24ffcb7e7244a9bf19d35bf2883b9c080c4ced3c07a9895572178cdb8f13f6a1"
+checksum = "db207d030ae38f1eb6f240d5a1c1c88ff422aa005d10f8c6c6fc5e75286ab30e"
 dependencies = [
  "bytemuck",
  "byteorder",
@@ -2036,9 +2035,9 @@ checksum = "1aab8fc367588b89dcee83ab0fd66b72b50b72fa1904d7095045ace2b0c81c35"
 
 [[package]]
 name = "jpeg-decoder"
-version = "0.1.22"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "229d53d58899083193af11e15917b5640cd40b29ff475a1fe4ef725deb02d0f2"
+checksum = "105fb082d64e2100074587f59a74231f771750c664af903f1f9f76c9dedfc6f1"
 
 [[package]]
 name = "js-sys"
@@ -2248,15 +2247,6 @@ dependencies = [
  "unicase",
 ]
 
-[[package]]
-name = "miniz_oxide"
-version = "0.3.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "791daaae1ed6889560f8c4359194f56648355540573244a5448a83ba1ecc7435"
-dependencies = [
- "adler32",
-]
-
 [[package]]
 name = "miniz_oxide"
 version = "0.4.4"
@@ -2267,6 +2257,15 @@ dependencies = [
  "autocfg 1.1.0",
 ]
 
+[[package]]
+name = "miniz_oxide"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2b29bd4bc3f33391105ebee3589c19197c4271e3e5a9ec9bfe8127eeff8f082"
+dependencies = [
+ "adler",
+]
+
 [[package]]
 name = "mutate_once"
 version = "0.1.1"
@@ -2411,9 +2410,9 @@ dependencies = [
 
 [[package]]
 name = "num-rational"
-version = "0.3.2"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "12ac428b1cb17fce6f731001d307d351ec70a6d202fc2e60f7d4c5e42d8f4f07"
+checksum = "d41702bd167c2df5520b384281bc111a4b5efcf7fbc4c9c222c815b07e0a6a6a"
 dependencies = [
  "autocfg 1.1.0",
  "num-integer",
@@ -2739,14 +2738,14 @@ dependencies = [
 
 [[package]]
 name = "png"
-version = "0.16.8"
+version = "0.17.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c3287920cb847dee3de33d301c463fba14dda99db24214ddf93f83d3021f4c6"
+checksum = "dc38c0ad57efb786dd57b9864e5b18bae478c00c824dc55a38bbc9da95dde3ba"
 dependencies = [
  "bitflags",
  "crc32fast",
  "deflate",
- "miniz_oxide 0.3.7",
+ "miniz_oxide 0.5.1",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 637eaf344..187077141 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,7 +34,7 @@ encoded-words = { git = "https://github.com/async-email/encoded-words", branch="
 escaper = "0.1"
 futures = "0.3"
 hex = "0.4.0"
-image = { version = "0.23.5", default-features=false, features = ["gif", "jpeg", "ico", "png", "pnm", "webp", "bmp"] }
+image = { version = "0.24.1", default-features=false, features = ["gif", "jpeg", "ico", "png", "pnm", "webp", "bmp"] }
 kamadak-exif = "0.5"
 lettre_email = { git = "https://github.com/deltachat/lettre", branch = "master" }
 libc = "0.2"
diff --git a/src/blob.rs b/src/blob.rs
index d652add20..0051327e0 100644
--- a/src/blob.rs
+++ b/src/blob.rs
@@ -3,17 +3,14 @@
 use core::cmp::max;
 use std::ffi::OsStr;
 use std::fmt;
+use std::io::Cursor;
 
 use async_std::path::{Path, PathBuf};
 use async_std::prelude::*;
 use async_std::{fs, io};
 
-use anyhow::format_err;
-use anyhow::Context as _;
-use anyhow::Error;
-use image::DynamicImage;
-use image::GenericImageView;
-use image::ImageFormat;
+use anyhow::{format_err, Context as _, Error};
+use image::{DynamicImage, ImageFormat};
 use num_traits::FromPrimitive;
 use thiserror::Error;
 
@@ -449,7 +446,8 @@ impl<'a> BlobObject<'a> {
 
         fn encode_img(img: &DynamicImage, encoded: &mut Vec<u8>) -> anyhow::Result<()> {
             encoded.clear();
-            img.write_to(encoded, image::ImageFormat::Jpeg)?;
+            let mut buf = Cursor::new(encoded);
+            img.write_to(&mut buf, image::ImageFormat::Jpeg)?;
             Ok(())
         }
         fn encoded_img_exceeds_bytes(
@@ -619,16 +617,14 @@ pub enum BlobError {
 mod tests {
     use fs::File;
 
-    use super::*;
-
-    use crate::chat::{create_group_chat, ProtectionStatus};
-    use crate::{
-        chat,
-        message::Message,
-        test_utils::{self, TestContext},
-    };
     use anyhow::Result;
-    use image::Pixel;
+    use image::{GenericImageView, Pixel};
+
+    use crate::chat::{self, create_group_chat, ProtectionStatus};
+    use crate::message::Message;
+    use crate::test_utils::{self, TestContext};
+
+    use super::*;
 
     #[async_std::test]
     async fn test_create() {
@@ -960,10 +956,11 @@ mod tests {
         .unwrap();
         assert_correct_rotation(&img_rotated);
 
-        let mut bytes = vec![];
+        let mut buf = Cursor::new(vec![]);
         img_rotated
-            .write_to(&mut bytes, image::ImageFormat::Jpeg)
+            .write_to(&mut buf, image::ImageFormat::Jpeg)
             .unwrap();
+        let bytes = buf.into_inner();
         let img_rotated = send_image_check_mediaquality(
             Some("0"),
             &bytes,