diff --git a/units/Cargo.toml b/units/Cargo.toml
index 1bad34a7c..078c9a642 100644
--- a/units/Cargo.toml
+++ b/units/Cargo.toml
@@ -18,13 +18,13 @@ std = ["alloc", "internals/std"]
 alloc = ["internals/alloc","serde?/alloc"]
 
 [dependencies]
-internals = { package = "bitcoin-internals", path = "../internals" }
+internals = { package = "bitcoin-internals", path = "../internals", version = "0.4.0" }
 
 serde = { version = "1.0.103", default-features = false, optional = true }
 arbitrary = { version = "1.4", optional = true }
 
 [dev-dependencies]
-internals = { package = "bitcoin-internals", path = "../internals", features = ["test-serde"] }
+internals = { package = "bitcoin-internals", path = "../internals", version = "0.4.0", features = ["test-serde"] }
 bincode = "1.3.1"
 serde = { version = "1.0.103", default-features = false, features = ["derive"] }
 serde_test = "1.0"