diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4afeb39c..58b6f41c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Update the arbitrary fuzzer to check arbitrary serde data types, values, and `ron::ser::PrettyConfig`s ([#465](https://github.com/ron-rs/ron/pull/465))
 - Add a benchmark for PRs that runs over the latest fuzzer corpus ([#465](https://github.com/ron-rs/ron/pull/465))
 - Fuzz serde enum representation and flatten attributes and collect current limitations in ron and serde ([#502](https://github.com/ron-rs/ron/pull/502))
+- Update `base64` dependency to version 0.22 ([#529](https://github.com/ron-rs/ron/pull/529))
 
 ## [0.8.1] - 2023-08-17
 
diff --git a/Cargo.toml b/Cargo.toml
index 25cd7379..a28a9889 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,7 +25,7 @@ integer128 = []
 
 [dependencies]
 # FIXME @juntyr remove base64 once old byte strings are fully deprecated
-base64 = "0.21"
+base64 = "0.22"
 bitflags = { version = "2.0", features = ["serde"] }
 indexmap = { version = "2.0", features = ["serde"], optional = true }
 # serde supports i128/u128 from 1.0.60 onwards
diff --git a/tests/438_rusty_byte_strings.rs b/tests/438_rusty_byte_strings.rs
index 1205afe1..1a02446f 100644
--- a/tests/438_rusty_byte_strings.rs
+++ b/tests/438_rusty_byte_strings.rs
@@ -72,7 +72,7 @@ fn v_9_deprecated_base64_bytes_support() {
     // Too much padding
     assert_eq!(
         Err(SpannedError {
-            code: Error::Base64Error(base64::DecodeError::InvalidLength),
+            code: Error::Base64Error(base64::DecodeError::InvalidByte(6, b'=')),
             position: Position { line: 1, col: 45 }
         }),
         ron::from_str::<BytesStruct>("BytesStruct( small:[1, 2], large:\"AQIDBA===\" )"),