diff --git a/services/tunnelbroker/Cargo.lock b/services/tunnelbroker/Cargo.lock
--- a/services/tunnelbroker/Cargo.lock
+++ b/services/tunnelbroker/Cargo.lock
@@ -8,7 +8,7 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b411d99f057bb20c324c758aeab7a063552511b90458d8109b5a6f2df700a8f"
 dependencies = [
- "base64",
+ "base64 0.13.1",
  "erased-serde",
  "futures",
  "http",
@@ -146,6 +146,12 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
 
+[[package]]
+name = "base64"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ea22880d78093b0cbe17c89f64a7d457941e65759157ec6cb31a31d652b05e5"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -1085,7 +1091,7 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "431949c384f4e2ae07605ccaa56d1d9d2ecdb5cadd4f9577ccfab29f2e5149fc"
 dependencies = [
- "base64",
+ "base64 0.13.1",
  "bytes",
  "encoding_rs",
  "futures-core",
@@ -1137,7 +1143,7 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "35edb675feee39aec9c99fa5ff985081995a06d594114ae14cbe797ad7b7a6d7"
 dependencies = [
- "base64",
+ "base64 0.13.1",
  "log",
  "ring",
  "sct",
@@ -1447,7 +1453,7 @@
  "async-stream",
  "async-trait",
  "axum",
- "base64",
+ "base64 0.13.1",
  "bytes",
  "futures-core",
  "futures-util",
@@ -1589,6 +1595,7 @@
 dependencies = [
  "a2",
  "anyhow",
+ "base64 0.20.0",
  "cxx",
  "cxx-build",
  "env_logger",
diff --git a/services/tunnelbroker/Cargo.toml b/services/tunnelbroker/Cargo.toml
--- a/services/tunnelbroker/Cargo.toml
+++ b/services/tunnelbroker/Cargo.toml
@@ -19,6 +19,7 @@
 fcm = "0.9"
 anyhow = "1.0"
 openssl = { version = "0.10", features = ["vendored"] }
+base64 = "0.20"
 tonic = "0.8"
 prost = "0.11"
 prost-types = "0.11"