diff --git a/Cargo.lock b/Cargo.lock
index e9aa644169..89bcf29dc0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -488,9 +488,9 @@ dependencies = [
 
 [[package]]
 name = "brotli"
-version = "3.3.4"
+version = "3.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1a0b1dbcc8ae29329621f8d4f0d835787c1c38bb1401979b49d13b0b305ff68"
+checksum = "516074a47ef4bce09577a3b379392300159ce5b1ba2e501ff1c819950066100f"
 dependencies = [
  "alloc-no-stdlib",
  "alloc-stdlib",
@@ -499,9 +499,9 @@ dependencies = [
 
 [[package]]
 name = "brotli-decompressor"
-version = "2.3.4"
+version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b6561fd3f895a11e8f72af2cb7d22e08366bebc2b6b57f7744c4bda27034744"
+checksum = "da74e2b81409b1b743f8f0c62cc6254afefb8b8e50bbfe3735550f7aeefa3448"
 dependencies = [
  "alloc-no-stdlib",
  "alloc-stdlib",
diff --git a/Cargo.toml b/Cargo.toml
index 60eded7edd..278bdb1cf8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -42,7 +42,7 @@ 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 = "3.3", default-features=false, features = ["std"] }
+brotli = { version = "3.4", 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" }