diff --git a/Cargo.lock b/Cargo.lock
index 48d5cc6..d450466 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -640,9 +640,9 @@ 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 6136440..1967558 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -45,7 +45,7 @@ divan = "0.1.15"
 # iai = "0.1.1"
 iai = { git = "https://github.com/sigaloid/iai", rev = "6c83e942" }
 insta = "1.42.2"
-once_cell = "1.20.3"
+once_cell = "1.21.0"
 
 # for examples
 # enable the features used in tests