diff --git a/frost-core/Cargo.toml b/frost-core/Cargo.toml
index ee627785..16947a1e 100644
--- a/frost-core/Cargo.toml
+++ b/frost-core/Cargo.toml
@@ -31,7 +31,7 @@ proptest-derive = { version = "0.3", optional = true }
 serde_json = { version = "1.0", optional = true }
 
 [dev-dependencies]
-curve25519-dalek = { version = "4.0.0-pre.1", features = ["serde"] }
+curve25519-dalek = { version = "=4.0.0-pre.1", features = ["serde"] }
 lazy_static = "1.4"
 proptest = "1.0"
 rand = "0.8"
diff --git a/frost-ed25519/Cargo.toml b/frost-ed25519/Cargo.toml
index 9e952d94..636badfc 100644
--- a/frost-ed25519/Cargo.toml
+++ b/frost-ed25519/Cargo.toml
@@ -22,7 +22,7 @@ description = "A Schnorr signature scheme over the prime-order Ristretto group t
 features = ["nightly"]
 
 [dependencies]
-curve25519-dalek = { version = "4.0.0-pre.1", features = ["serde"] }
+curve25519-dalek = { version = "=4.0.0-pre.1", features = ["serde"] }
 frost-core = { path = "../frost-core", features = ["test-impl"] }
 frost-ristretto255 = { path = "../frost-ristretto255" }
 rand_core = "0.6"
diff --git a/frost-ristretto255/Cargo.toml b/frost-ristretto255/Cargo.toml
index 34f95979..f195e431 100644
--- a/frost-ristretto255/Cargo.toml
+++ b/frost-ristretto255/Cargo.toml
@@ -18,7 +18,7 @@ description = "A Schnorr signature scheme over the prime-order Ristretto group t
 features = ["nightly"]
 
 [dependencies]
-curve25519-dalek = { version = "4.0.0-pre.1", features = ["serde"] }
+curve25519-dalek = { version = "=4.0.0-pre.1", features = ["serde"] }
 frost-core = { path = "../frost-core", features = ["test-impl"] }
 rand_core = "0.6"
 sha2 = "0.10.2"