diff --git a/Cargo.lock b/Cargo.lock
index 8f702d6..3c28da0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1987,11 +1987,10 @@ dependencies = [
 
 [[package]]
 name = "decancer"
-version = "3.3.3"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9244323129647178bf41ac861a2cdb9d9c81b9b09d3d0d1de9cd302b33b8a1d"
+checksum = "453589e364ce786381e7bcbf0d659088ff7e4d3e77f948dd1cf861344acf7a86"
 dependencies = [
- "lazy_static",
  "regex",
 ]
 
diff --git a/crates/common/Cargo.toml b/crates/common/Cargo.toml
index 5e28be2..99dae45 100644
--- a/crates/common/Cargo.toml
+++ b/crates/common/Cargo.toml
@@ -54,7 +54,7 @@ sha2 = "0.11"
 md5 = "0.8.1"
 whatlang = "0.18"
 idna = "1.1"
-decancer = "3.3.3"
+decancer = "4.0.0"
 unicode-security = "0.1.2"
 infer = "0.22"
 bincode = { version = "2.0.1", features = ["serde"] }
diff --git a/crates/spam-filter/Cargo.toml b/crates/spam-filter/Cargo.toml
index 560d786..221adc3 100644
--- a/crates/spam-filter/Cargo.toml
+++ b/crates/spam-filter/Cargo.toml
@@ -19,7 +19,7 @@ tokio = { version = "1.53", features = ["net", "macros"] }
 psl = "2"
 hyper = { version = "1.11.1", features = ["server", "http1", "http2"] }
 idna = "1.1"
-decancer = "3.3.3"
+decancer = "4.0.0"
 unicode-security = "0.1.2"
 infer = "0.22"
 hashify = "0.2"