diff --git a/Cargo.lock b/Cargo.lock
index 753f0ab2..361f8f75 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -381,6 +381,12 @@ version = "0.21.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9d297deb1925b89f2ccc13d7635fa0714f12c87adce1c75356b39ca9b7178567"
 
+[[package]]
+name = "base64"
+version = "0.22.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9475866fec1451be56a3c2400fd081ff546538961565ccb5b7142cbd22bc7a51"
+
 [[package]]
 name = "base64ct"
 version = "1.6.0"
@@ -1753,7 +1759,7 @@ version = "3.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1b8fcc794035347fb64beda2d3b462595dd2753e3f268d89c5aae77e8cf2c310"
 dependencies = [
- "base64",
+ "base64 0.21.7",
  "serde",
 ]
 
@@ -2148,7 +2154,7 @@ name = "rustls"
 version = "0.23.4"
 dependencies = [
  "aws-lc-rs",
- "base64",
+ "base64 0.22.0",
  "bencher",
  "env_logger",
  "log",
@@ -2216,7 +2222,7 @@ name = "rustls-openssl-tests"
 version = "0.0.1"
 dependencies = [
  "asn1",
- "base64",
+ "base64 0.22.0",
  "num-bigint",
  "once_cell",
  "openssl",
@@ -2231,7 +2237,7 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1c74cae0a4cf6ccbbf5f359f08efdf8ee7e1dc532573bf0db71968cb56b1448c"
 dependencies = [
- "base64",
+ "base64 0.21.7",
 ]
 
 [[package]]
@@ -2240,7 +2246,7 @@ version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f48172685e6ff52a556baa527774f61fcaa884f59daf3375c62a3f1cd2549dab"
 dependencies = [
- "base64",
+ "base64 0.21.7",
  "rustls-pki-types",
 ]
 
diff --git a/openssl-tests/Cargo.toml b/openssl-tests/Cargo.toml
index bca0f118..e98a6cad 100644
--- a/openssl-tests/Cargo.toml
+++ b/openssl-tests/Cargo.toml
@@ -8,7 +8,7 @@ version = "0.0.1"
 
 [dependencies]
 asn1 = "0.16"
-base64 = "0.21"
+base64 = "0.22"
 num-bigint = "0.4.4"
 once_cell = "1.19"
 rustls = {path = "../rustls"}
diff --git a/rustls/Cargo.toml b/rustls/Cargo.toml
index b4d7e46b..bd4b197b 100644
--- a/rustls/Cargo.toml
+++ b/rustls/Cargo.toml
@@ -38,7 +38,7 @@ read_buf = ["rustversion", "std"]
 fips = ["aws_lc_rs", "aws-lc-rs?/fips"]
 
 [dev-dependencies]
-base64 = "0.21"
+base64 = "0.22"
 bencher = "0.1.5"
 env_logger = "0.10" # 0.11 requires 1.71 MSRV even as a dev-dep (due to manifest features)
 log = "0.4.4"