diff --git a/Cargo.lock b/Cargo.lock
index f856a827b..43adeceb2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1272,9 +1272,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.20.3"
+version = "1.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "945462a4b81e43c4e3ba96bd7b49d834c6f61198356aa858733bc4acf3cbe62e"
+checksum = "cde51589ab56b20a6f686b2c68f7a0bd6add753d697abf720d63f8db3ab7b1ad"
 
 [[package]]
 name = "oorandom"
diff --git a/Cargo.toml b/Cargo.toml
index 7e84d28ba..4c2875ab9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -38,7 +38,7 @@ itertools = "0.14.0"
 hickory-resolver = { version = "0.24.3", features = ["dns-over-rustls"] }
 anyhow = "1.0.40"
 text_placeholder = { version = "0.5", features = ["struct_context"] }
-once_cell = "1.20.3"
+once_cell = "1.21.0"
 
 [dev-dependencies]
 parameterized = "2.0.0"