diff --git a/Cargo.lock b/Cargo.lock
index cb8cebaf8..a45523564 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -384,7 +384,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "41262f11d771fd4a61aa3ce019fca363b4b6c282fca9da2a31186d3965a47a5c"
 dependencies = [
  "either",
- "radium",
+ "radium 0.3.0",
+]
+
+[[package]]
+name = "bitvec"
+version = "0.20.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f5011ffc90248764d7005b0e10c7294f5aa1bd87d9dd7248f4ad475b347c294d"
+dependencies = [
+ "funty",
+ "radium 0.6.2",
+ "tap",
+ "wyz",
 ]
 
 [[package]]
@@ -1513,11 +1525,23 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9abe4578ed343c7a2c9d617cd2b1895ba0a87a6a4dee97bde156d65f608c7b2d"
 dependencies = [
  "generic-array 0.14.4",
- "rand_core 0.5.1",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "elliptic-curve"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c237c70e5a4013efd3e8f1e49e79b58d0bfd601c6783d82fb819d04a29b85297"
+dependencies = [
+ "ff",
+ "generic-array 0.14.4",
+ "group",
+ "rand_core 0.6.1",
+ "subtle",
+]
+
 [[package]]
 name = "enclave-macro"
 version = "0.6.0"
@@ -1662,6 +1686,17 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "ff"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72a4d941a5b7c2a75222e2d44fcdf634a67133d9db31e177ae5ff6ecda852bfe"
+dependencies = [
+ "bitvec 0.20.1",
+ "rand_core 0.6.1",
+ "subtle",
+]
+
 [[package]]
 name = "fixed"
 version = "1.5.0"
@@ -1764,6 +1799,12 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
 
+[[package]]
+name = "funty"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fed34cd105917e91daa4da6b3728c47b068749d6a62c59811f06ed2ac71d9da7"
+
 [[package]]
 name = "futures"
 version = "0.1.29"
@@ -1961,6 +2002,17 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "group"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61b3c1e8b4f1ca07e6605ea1be903a5f6956aec5c8a67fd44d56076631675ed8"
+dependencies = [
+ "ff",
+ "rand_core 0.6.1",
+ "subtle",
+]
+
 [[package]]
 name = "grpc"
 version = "0.8.1"
@@ -3024,7 +3076,7 @@ dependencies = [
  "assert_matches",
  "chain-util",
  "chrono",
- "elliptic-curve 0.5.0",
+ "elliptic-curve 0.9.0",
  "generic-array 0.14.4",
  "hkdf 0.10.0",
  "hpke",
@@ -3297,7 +3349,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "79602888a81ace83e3d1d4b2873286c1f5f906c84db667594e8db8da3506c383"
 dependencies = [
  "arrayvec 0.5.1",
- "bitvec",
+ "bitvec 0.17.4",
  "byte-slice-cast",
  "parity-scale-codec-derive",
  "serde",
@@ -3846,6 +3898,12 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "def50a86306165861203e7f84ecffbbdfdea79f0e51039b33de1e952358c47ac"
 
+[[package]]
+name = "radium"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "643f8f41a8ebc4c5dc4515c82bb8abd397b527fc20fd681b7c011c2aee5d44fb"
+
 [[package]]
 name = "rand"
 version = "0.4.6"
@@ -3948,6 +4006,12 @@ dependencies = [
  "getrandom 0.1.14",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c026d7df8b298d90ccbbc5190bd04d85e159eaf5576caeacf8741da93ccbd2e5"
+
 [[package]]
 name = "rand_hc"
 version = "0.1.0"
@@ -4869,6 +4933,12 @@ dependencies = [
  "chrono",
 ]
 
+[[package]]
+name = "tap"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "36474e732d1affd3a6ed582781b3683df3d0563714c59c39591e8ff707cf078e"
+
 [[package]]
 name = "tdb-enclave-app"
 version = "0.6.0"
@@ -5991,6 +6061,12 @@ dependencies = [
  "winapi-build",
 ]
 
+[[package]]
+name = "wyz"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85e60b0d1b5f99db2556934e21937020776a5d31520bf169e851ac44e6420214"
+
 [[package]]
 name = "x509-parser"
 version = "0.8.2"
diff --git a/chain-tx-enclave-next/mls/Cargo.toml b/chain-tx-enclave-next/mls/Cargo.toml
index 5727c247b..3c18a6d01 100644
--- a/chain-tx-enclave-next/mls/Cargo.toml
+++ b/chain-tx-enclave-next/mls/Cargo.toml
@@ -22,7 +22,7 @@ chrono="0.4.19"
 ra-client = { path = "../enclave-ra/ra-client" }
 subtle = "2.4.0"
 chain-util = { path = "../../chain-util" }
-elliptic-curve = "0.5.0"
+elliptic-curve = "0.9.0"
 p256 = { version = "0.4.1", features = ["arithmetic", "zeroize"] }
 zeroize = "1.2"
 parity-scale-codec = { features = ["derive"], version = "1.3" }