diff --git a/Cargo.toml b/Cargo.toml
index 3b448c6..63de3be 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,8 +28,8 @@ httpdate = { version = "1", optional = true }
 mime = { version = "0.3.4", optional = true }
 fastrand = { version = "1.4", optional = true }
 quoted_printable = { version = "0.4.6", optional = true }
-base64 = { version = "0.13", optional = true }
-email-encoding = { git = "https://github.com/lettre/email-encoding.git", rev = "e255be51b1d7f957464cc9f135aef74e3c78bb64", optional = true }
+base64 = { version = "0.20", optional = true }
+email-encoding = { git = "https://github.com/lettre/email-encoding.git", rev = "e5db2da2ebb6e6255a22daa3374c053c15343527", optional = true }
 
 # file transport
 uuid = { version = "1", features = ["v4"], optional = true }