diff --git a/Cargo.lock b/Cargo.lock
index 84e0299788997..8d401d6881f6b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -13974,7 +13974,7 @@ dependencies = [
  "aws-smithy-runtime",
  "aws-smithy-types",
  "axum",
- "base64 0.22.0",
+ "base64 0.21.7",
  "bigdecimal 0.4.2",
  "bit-vec",
  "bitflags 2.4.0",
diff --git a/src/workspace-hack/Cargo.toml b/src/workspace-hack/Cargo.toml
index f2b4d68a451dd..0ccf67e9d0671 100644
--- a/src/workspace-hack/Cargo.toml
+++ b/src/workspace-hack/Cargo.toml
@@ -30,7 +30,7 @@ aws-sigv4 = { version = "1", features = ["http0-compat", "sign-eventstream", "si
 aws-smithy-runtime = { version = "1", default-features = false, features = ["client", "rt-tokio", "tls-rustls"] }
 aws-smithy-types = { version = "1", default-features = false, features = ["byte-stream-poll-next", "http-body-0-4-x", "hyper-0-14-x", "rt-tokio"] }
 axum = { version = "0.6" }
-base64 = { version = "0.22", features = ["alloc"] }
+base64 = { version = "0.21" }
 bigdecimal = { version = "0.4" }
 bit-vec = { version = "0.6" }
 bitflags = { version = "2", default-features = false, features = ["serde", "std"] }