diff --git a/Cargo.lock b/Cargo.lock
index 5d1facb..6eda027 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -201,7 +201,7 @@ dependencies = [
  "cc",
  "cfg-if",
  "constant_time_eq",
- "digest",
+ "digest 0.10.7",
 ]
 
 [[package]]
@@ -589,6 +589,19 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "curve25519-dalek-ng"
+version = "4.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c359b7249347e46fb28804470d071c921156ad62b3eef5d34e2ba867533dec8"
+dependencies = [
+ "byteorder",
+ "digest 0.9.0",
+ "rand_core 0.6.4",
+ "subtle-ng",
+ "zeroize",
+]
+
 [[package]]
 name = "deranged"
 version = "0.3.11"
@@ -598,6 +611,15 @@ dependencies = [
  "powerfmt",
 ]
 
+[[package]]
+name = "digest"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
+dependencies = [
+ "generic-array",
+]
+
 [[package]]
 name = "digest"
 version = "0.10.7"
@@ -1942,7 +1964,7 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest",
+ "digest 0.10.7",
  "keccak",
 ]
 
@@ -2013,6 +2035,12 @@ version = "2.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
+[[package]]
+name = "subtle-ng"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "734676eb262c623cec13c3155096e08d1f8f29adce39ba17948b18dad1e54142"
+
 [[package]]
 name = "syn"
 version = "2.0.90"
@@ -2027,11 +2055,11 @@ dependencies = [
 [[package]]
 name = "tandem"
 version = "0.3.0"
-source = "git+https://github.com/sine-fdn/tandem.git#49c6ae336d6de82ad627c655b51e0b9edef7ecb9"
+source = "git+https://github.com/sine-fdn/tandem.git#498474e6c0474c7a26073823c72bf60bf20402b6"
 dependencies = [
  "bincode",
  "blake3",
- "curve25519-dalek",
+ "curve25519-dalek-ng",
  "rand 0.8.5",
  "rand_chacha 0.3.1",
  "serde",