diff --git a/Cargo.lock b/Cargo.lock
index 7d3c196ac..0ca9c74d1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3589,15 +3589,15 @@ checksum = "6446ced80d6c486436db5c078dde11a9f73d42b57fb273121e160b84f63d894c"
 
 [[package]]
 name = "strum"
-version = "0.21.0"
+version = "0.22.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aaf86bbcfd1fa9670b7a129f64fc0c9fcbbfe4f1bc4210e9e98fe71ffc12cde2"
+checksum = "f7ac893c7d471c8a21f31cfe213ec4f6d9afeed25537c772e08ef3f005f8729e"
 
 [[package]]
 name = "strum_macros"
-version = "0.21.1"
+version = "0.22.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d06aaeeee809dbc59eb4556183dd927df67db1540de5be8d3ec0b6636358a5ec"
+checksum = "339f799d8b549e3744c7ac7feb216383e4005d94bdb22561b3ab8f3b808ae9fb"
 dependencies = [
  "heck",
  "proc-macro2",
diff --git a/Cargo.toml b/Cargo.toml
index 7771ebac2..a33224e02 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -66,8 +66,8 @@ sha-1 = "0.9"
 sha2 = "0.9"
 smallvec = "1"
 stop-token = "0.4"
-strum = "0.21"
-strum_macros = "0.21"
+strum = "0.22"
+strum_macros = "0.22"
 surf = { version = "2.3", default-features = false, features = ["h1-client"] }
 thiserror = "1"
 toml = "0.5"
diff --git a/src/headerdef.rs b/src/headerdef.rs
index 66f71e9a9..10c9380d1 100644
--- a/src/headerdef.rs
+++ b/src/headerdef.rs
@@ -1,9 +1,8 @@
 //! # List of email headers.
 
-use crate::strum::AsStaticRef;
 use mailparse::{MailHeader, MailHeaderMap};
 
-#[derive(Debug, Display, Clone, PartialEq, Eq, EnumVariantNames, AsStaticStr)]
+#[derive(Debug, Display, Clone, PartialEq, Eq, EnumVariantNames, IntoStaticStr)]
 #[strum(serialize_all = "kebab_case")]
 pub enum HeaderDef {
     MessageId,
@@ -67,9 +66,9 @@ pub enum HeaderDef {
 }
 
 impl HeaderDef {
-    /// Returns the corresponding Event id.
+    /// Returns the corresponding header string.
     pub fn get_headername(&self) -> &'static str {
-        self.as_static()
+        self.into()
     }
 }