diff --git a/Cargo.lock b/Cargo.lock
index 5d3fd7bef4070..99a283bc93c95 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -7709,9 +7709,9 @@ dependencies = [
 
 [[package]]
 name = "serde_yaml"
-version = "0.9.19"
+version = "0.9.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f82e6c8c047aa50a7328632d067bcae6ef38772a79e28daf32f735e0e4f3dd10"
+checksum = "d9d684e3ec7de3bf5466b32bd75303ac16f0736426e5a4e0d6e489559ce1249c"
 dependencies = [
  "indexmap",
  "itoa",
@@ -9380,7 +9380,7 @@ dependencies = [
  "reqwest",
  "serde",
  "serde_json",
- "serde_yaml 0.9.19",
+ "serde_yaml 0.9.21",
  "sha2 0.10.6",
  "tempfile",
  "toml 0.7.3",
@@ -9533,7 +9533,7 @@ dependencies = [
  "serde_bytes",
  "serde_json",
  "serde_with 2.3.2",
- "serde_yaml 0.9.19",
+ "serde_yaml 0.9.21",
  "sha2 0.10.6",
  "similar-asserts",
  "smallvec",
@@ -9640,7 +9640,7 @@ dependencies = [
  "rand 0.8.5",
  "rkyv",
  "serde",
- "serde_yaml 0.9.19",
+ "serde_yaml 0.9.21",
  "snafu",
  "temp-dir",
  "tokio",
diff --git a/Cargo.toml b/Cargo.toml
index d0f8c5e684802..855d52ce93019 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -193,7 +193,7 @@ serde-toml-merge = { version = "0.3.0", default-features = false }
 serde_bytes = { version = "0.11.9", default-features = false, features = ["std"], optional = true }
 serde_json = { version = "1.0.95", default-features = false, features = ["raw_value"] }
 serde_with = { version = "2.3.2", default-features = false, features = ["macros", "std"] }
-serde_yaml = { version = "0.9.19", default-features = false }
+serde_yaml = { version = "0.9.21", default-features = false }
 
 # Messagepack
 rmp-serde = { version = "1.1.1", default-features = false, optional = true }
diff --git a/lib/vector-buffers/src/config.rs b/lib/vector-buffers/src/config.rs
index 552daf68ccafa..67a1994c3bb6d 100644
--- a/lib/vector-buffers/src/config.rs
+++ b/lib/vector-buffers/src/config.rs
@@ -406,21 +406,21 @@ mod test {
         }
     }
 
+    const BUFFER_CONFIG_NO_MATCH_ERR: &str =
+        "data did not match any variant of untagged enum BufferConfig";
+
     #[test]
     fn parse_empty() {
         let source = "";
         let error = serde_yaml::from_str::<BufferConfig>(source).unwrap_err();
-        assert_eq!(error.to_string(), "EOF while parsing a value");
+        assert_eq!(error.to_string(), BUFFER_CONFIG_NO_MATCH_ERR);
     }
 
     #[test]
     fn parse_only_invalid_keys() {
         let source = "foo: 314";
         let error = serde_yaml::from_str::<BufferConfig>(source).unwrap_err();
-        assert_eq!(
-            error.to_string(),
-            "data did not match any variant of untagged enum BufferConfig"
-        );
+        assert_eq!(error.to_string(), BUFFER_CONFIG_NO_MATCH_ERR);
     }
 
     #[test]
@@ -429,10 +429,7 @@ mod test {
 max_events: 42
 "#;
         let error = serde_yaml::from_str::<BufferConfig>(source).unwrap_err();
-        assert_eq!(
-            error.to_string(),
-            "data did not match any variant of untagged enum BufferConfig"
-        );
+        assert_eq!(error.to_string(), BUFFER_CONFIG_NO_MATCH_ERR);
     }
 
     #[test]
diff --git a/vdev/Cargo.toml b/vdev/Cargo.toml
index bbc3da48ae664..ccc6393620f09 100644
--- a/vdev/Cargo.toml
+++ b/vdev/Cargo.toml
@@ -34,7 +34,7 @@ regex = { version = "1.7.1", default-features = false, features = ["std", "perf"
 reqwest = { version = "0.11", features = ["json", "blocking"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0.95"
-serde_yaml = "0.9.19"
+serde_yaml = "0.9.21"
 sha2 = "0.10.6"
 tempfile = "3.5.0"
 toml = { version = "0.7.2", default-features = false, features = ["parse"] }