diff --git a/Cargo.lock b/Cargo.lock
index 6addab7b1..75e4fb4b7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -507,9 +507,9 @@ dependencies = [
 
 [[package]]
 name = "brotli"
-version = "3.4.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "516074a47ef4bce09577a3b379392300159ce5b1ba2e501ff1c819950066100f"
+checksum = "125740193d7fee5cc63ab9e16c2fdc4e07c74ba755cc53b327d6ea029e9fc569"
 dependencies = [
  "alloc-no-stdlib",
  "alloc-stdlib",
@@ -518,9 +518,9 @@ dependencies = [
 
 [[package]]
 name = "brotli-decompressor"
-version = "2.5.1"
+version = "3.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e2e4afe60d7dd600fdd3de8d0f08c2b7ec039712e3b6137ff98b7004e82de4f"
+checksum = "65622a320492e09b5e0ac436b14c54ff68199bac392d0e89a6832c4518eea525"
 dependencies = [
  "alloc-no-stdlib",
  "alloc-stdlib",
diff --git a/Cargo.toml b/Cargo.toml
index ca042d62c..784bd04a8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -45,7 +45,7 @@ async-smtp = { version = "0.9", default-features = false, features = ["runtime-t
 async_zip = { version = "0.0.12", default-features = false, features = ["deflate", "fs"] }
 backtrace = "0.3"
 base64 = "0.21"
-brotli = { version = "3.4", default-features=false, features = ["std"] }
+brotli = { version = "4", default-features=false, features = ["std"] }
 chrono = { version = "0.4", default-features=false, features = ["clock", "std"] }
 email = { git = "https://github.com/deltachat/rust-email", branch = "master" }
 encoded-words = { git = "https://github.com/async-email/encoded-words", branch = "master" }