diff --git a/Cargo.lock b/Cargo.lock
index ba1df2d28..74dbf0930 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2141,9 +2141,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.21.1"
+version = "1.21.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d75b0bedcc4fe52caa0e03d9f1151a323e4aa5e2d78ba3580400cd3c9e2bc4bc"
+checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
 
 [[package]]
 name = "oorandom"
diff --git a/actix-http/Cargo.toml b/actix-http/Cargo.toml
index 06b40172d..0e5c4b234 100644
--- a/actix-http/Cargo.toml
+++ b/actix-http/Cargo.toml
@@ -155,7 +155,7 @@ divan = "0.1.8"
 env_logger = "0.11"
 futures-util = { version = "0.3.17", default-features = false, features = ["alloc"] }
 memchr = "2.4"
-once_cell = "1.9"
+once_cell = "1.21"
 rcgen = "0.13"
 regex = "1.3"
 rustversion = "1"
diff --git a/actix-web/Cargo.toml b/actix-web/Cargo.toml
index 153934ba6..29c6970e6 100644
--- a/actix-web/Cargo.toml
+++ b/actix-web/Cargo.toml
@@ -155,7 +155,7 @@ impl-more = "0.1.4"
 language-tags = "0.3"
 log = "0.4"
 mime = "0.3"
-once_cell = "1.5"
+once_cell = "1.21"
 pin-project-lite = "0.2.7"
 regex = { version = "1.5.5", optional = true }
 regex-lite = "0.1"