diff --git a/Cargo.lock b/Cargo.lock
index 6186f02..c67ed93 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -85,6 +85,12 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
 
+[[package]]
+name = "base64"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4a4ddaa51a5bc52a6948f74c06d20aaaddb71924eab79b8c97a8c556e942d6a"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -162,7 +168,7 @@ version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "34dd14c63662e0206599796cd5e1ad0268ab2b9d19b868d6050d688eba2bbf98"
 dependencies = [
- "base64",
+ "base64 0.13.0",
  "memchr",
 ]
 
@@ -371,7 +377,7 @@ dependencies = [
 name = "imap"
 version = "3.0.0-alpha.9"
 dependencies = [
- "base64",
+ "base64 0.21.0",
  "bufstream",
  "chrono",
  "encoding",
@@ -427,7 +433,7 @@ version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2eabca5e0b4d0e98e7f2243fb5b7520b6af2b65d8f87bcc86f2c75185a6ff243"
 dependencies = [
- "base64",
+ "base64 0.13.0",
  "email-encoding",
  "email_address",
  "fastrand",
@@ -791,7 +797,7 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0864aeff53f8c05aa08d86e5ef839d3dfcf07aeba2db32f12db0ef716e87bd55"
 dependencies = [
- "base64",
+ "base64 0.13.0",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 1fb34b3..34efd77 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ regex = "1.0"
 bufstream = "0.1.3"
 imap-proto = "0.16.1"
 nom = { version = "7.1.0", default-features = false }
-base64 = "0.13"
+base64 = "0.21"
 chrono = { version = "0.4", default-features = false, features = ["std"]}
 lazy_static = "1.4"
 ouroboros = "0.15.0"