diff --git a/Cargo.lock b/Cargo.lock
index 47b6c0c3f..a494e5308 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -772,7 +772,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6d2301688392eb071b0bf1a37be05c469d3cc4dbbd95df672fe28ab021e6a096"
 dependencies = [
  "quote",
- "syn",
+ "syn 1.0.109",
 ]
 
 [[package]]
@@ -1259,7 +1259,7 @@ checksum = "69e0cd8a998937e25c6ba7cc276b96ec5cc3f4dc4ab5de9ede4fb152bdd5c5eb"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.109",
 ]
 
 [[package]]
@@ -3711,7 +3711,7 @@ checksum = "bf9f5f225956dc2254c6c27500deac9390a066b2e8a1a571300627a7c4400a33"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.109",
 ]
 
 [[package]]
diff --git a/shotover-proxy/src/config/chain.rs b/shotover-proxy/src/config/chain.rs
index de3186ff2..ed76e91a8 100644
--- a/shotover-proxy/src/config/chain.rs
+++ b/shotover-proxy/src/config/chain.rs
@@ -22,6 +22,25 @@ impl TransformChainConfig {
     }
 }
 
+/// This function is a custom deserializer that works around a mismatch in the way yaml and typetag represent things,
+/// resulting in typetagged structs with no fields failing to deserialize from a single line yaml entry.
+/// e.g. with typetag + yaml + the default serializer:
+/// this would fail to deserialize:
+/// ```yaml
+/// chain_config:
+///   redis_chain:
+///     - NullSink
+/// ```
+///
+/// but this would work fine:
+/// ```yaml
+/// chain_config:
+///   redis_chain:
+///     - NullSink: {}
+/// ```
+///
+/// With the use of this custom deserializer both cases now deserialize correctly.
+/// The implementation was a suggestion from dtolnay: https://github.com/dtolnay/typetag/pull/40#issuecomment-1454961686
 fn vec_transform_config<'de, D>(deserializer: D) -> Result<Vec<Box<dyn TransformConfig>>, D::Error>
 where
     D: Deserializer<'de>,