diff --git a/Cargo.lock b/Cargo.lock
index 3099af462..74f12e53c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1157,9 +1157,9 @@ checksum = "7a2d987857b319362043e95f5353c0535c1f58eec5336fdfcf626430af7def58"
 
 [[package]]
 name = "rfc6979"
-version = "0.5.0-rc.3"
+version = "0.5.0-rc.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "63b8e2323084c987a72875b2fd682b7307d5cf14d47e3875bb5e89948e8809d4"
+checksum = "4a478f26ee9327bce006ff44c03e9a80dba5cedfba171d37c03ca3669e70d461"
 dependencies = [
  "hmac",
  "subtle",
diff --git a/bignp256/Cargo.toml b/bignp256/Cargo.toml
index 8176e2de8..865704ae9 100644
--- a/bignp256/Cargo.toml
+++ b/bignp256/Cargo.toml
@@ -28,7 +28,7 @@ hex-literal = { version = "1", optional = true }
 hkdf = { version = "0.13.0-rc.4", optional = true }
 hmac = { version = "0.13.0-rc.4", optional = true }
 rand_core = "0.10.0-rc-6"
-rfc6979 = { version = "0.5.0-rc.3", optional = true }
+rfc6979 = { version = "0.5.0-rc.4", optional = true }
 pkcs8 = { version = "0.11.0-rc.9", optional = true }
 primefield = { version = "0.14.0-rc.6", optional = true }
 primeorder = { version = "0.14.0-rc.6", optional = true }
diff --git a/sm2/Cargo.toml b/sm2/Cargo.toml
index cce8f22e9..45f460897 100644
--- a/sm2/Cargo.toml
+++ b/sm2/Cargo.toml
@@ -25,7 +25,7 @@ rand_core = { version = "0.10.0-rc-6", default-features = false }
 # optional dependencies
 primefield = { version = "0.14.0-rc.6", optional = true }
 primeorder = { version = "0.14.0-rc.6", optional = true }
-rfc6979 = { version = "0.5.0-rc.3", optional = true }
+rfc6979 = { version = "0.5.0-rc.4", optional = true }
 serdect = { version = "0.4", optional = true, default-features = false }
 signature = { version = "3.0.0-rc.9", optional = true, features = ["rand_core"] }
 sm3 = { version = "0.5.0-rc.3", optional = true, default-features = false }