diff --git a/Cargo.lock b/Cargo.lock
index 2967628..7ccbc8e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -245,6 +245,12 @@ dependencies = [
  "memchr 2.4.1",
 ]
 
+[[package]]
+name = "email_address"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8684b7c9cb4857dfa1e5b9629ef584ba618c9b93bae60f58cb23f4f271d0468e"
+
 [[package]]
 name = "encoding_rs"
 version = "0.8.30"
@@ -615,12 +621,13 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "lettre"
-version = "0.10.0-rc.6"
+version = "0.10.0-rc.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2f6c70001f7ee6c93b6687a06607c7a38f9a7ae460139a496c23da21e95bc289"
+checksum = "0f7e87d9d44162eea7abd87b1a7540fcb10d5e58e8bb4f173178f3dc6e453944"
 dependencies = [
  "base64",
  "email-encoding",
+ "email_address",
  "fastrand",
  "futures-util",
  "hostname",
@@ -631,8 +638,8 @@ dependencies = [
  "nom 7.1.1",
  "once_cell",
  "quoted_printable",
- "regex",
  "serde",
+ "socket2",
 ]
 
 [[package]]
@@ -1283,6 +1290,16 @@ version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"
 
+[[package]]
+name = "socket2"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "66d72b759436ae32898a2af0a14218dbf55efde3feeb170eb623637db85ee1e0"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "string_cache"
 version = "0.8.3"
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
index 50fea80..25b638c 100644
--- a/cli/Cargo.toml
+++ b/cli/Cargo.toml
@@ -33,7 +33,7 @@ env_logger = "0.8.3"
 erased-serde = "0.3.18"
 himalaya-lib = { path = "../lib" }
 html-escape = "0.2.9"
-lettre = { version = "0.10.0-rc.1", features = ["serde"] }
+lettre = { version = "0.10.0-rc.7", features = ["serde"] }
 log = "0.4.14"
 mailparse = "0.13.6"
 native-tls = "0.2.8"
diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index b28fb40..68f0916 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -10,7 +10,7 @@ notmuch-backend = ["notmuch", "maildir-backend"]
 default = ["imap-backend", "maildir-backend"]
 
 [dependencies]
-lettre = { version = "0.10.0-rc.6", features = ["serde"] }
+lettre = { version = "0.10.0-rc.7", features = ["serde"] }
 log = "0.4.14"
 mailparse = "0.13.6"
 serde = { version = "1.0.118", features = ["derive"] }