diff --git a/Cargo.lock b/Cargo.lock
index a1efe92..fadb2b0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1358,7 +1358,7 @@ dependencies = [
  "serde",
  "serde_json",
  "sha2",
- "socket2",
+ "socket2 0.6.0",
  "tokio",
  "tokio-boring",
  "tokio-native-tls",
@@ -1374,9 +1374,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.171"
+version = "0.2.174"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c19937216e9d3aa9956d9bb8dfc0b0c8beb6058fc4f7a4dc4d850edf86a237d6"
+checksum = "1171693293099992e19cddea4e8b849964e9846f4acee11b3948bcc337be8776"
 
 [[package]]
 name = "libloading"
@@ -2256,6 +2256,16 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "socket2"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "233504af464074f9d066d7b5416c5f9b894a5862a6506e306f7b816cdd6f1807"
+dependencies = [
+ "libc",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "spin"
 version = "0.9.8"
@@ -2405,7 +2415,7 @@ dependencies = [
  "mio",
  "pin-project-lite",
  "signal-hook-registry",
- "socket2",
+ "socket2 0.5.9",
  "tokio-macros",
  "windows-sys 0.52.0",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index d75b870..313134d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -42,7 +42,7 @@ serde_json = { version = "1", optional = true }
 # smtp-transport
 nom = { version = "8", optional = true }
 hostname = { version = "0.4", optional = true } # feature
-socket2 = { version = "0.5.1", optional = true }
+socket2 = { version = "0.6", optional = true }
 url = { version = "2.4", optional = true }
 percent-encoding = { version = "2.3", optional = true }