diff --git a/base58/Cargo.toml b/base58/Cargo.toml
index c83a11b5..61fe35a0 100644
--- a/base58/Cargo.toml
+++ b/base58/Cargo.toml
@@ -22,7 +22,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
 hashes = { package = "bitcoin_hashes", version = "0.14.0", default-features = false, features = ["alloc"] }
-internals = { package = "bitcoin-internals", version = "0.3.0" }
+internals = { package = "bitcoin-internals", version = "0.3.0", features = ["alloc"] }
 
 [dev-dependencies]
 hex = { package = "hex-conservative", version = "0.2.0", default-features = false, features = ["alloc"] }
diff --git a/bitcoin/Cargo.toml b/bitcoin/Cargo.toml
index cb343929..5aaf6a56 100644
--- a/bitcoin/Cargo.toml
+++ b/bitcoin/Cargo.toml
@@ -33,7 +33,7 @@ bech32 = { version = "0.11.0", default-features = false, features = ["alloc"] }
 hashes = { package = "bitcoin_hashes", version = "0.14.0", default-features = false, features = ["alloc", "io"] }
 hex = { package = "hex-conservative", version = "0.2.0", default-features = false, features = ["alloc"] }
 hex_lit = "0.1.1"
-internals = { package = "bitcoin-internals", version = "0.3.0" }
+internals = { package = "bitcoin-internals", version = "0.3.0", features = ["alloc"] }
 io = { package = "bitcoin-io", version = "0.1.1", default-features = false, features = ["alloc"] }
 secp256k1 = { version = "0.29.0", default-features = false, features = ["hashes", "alloc"] }
 units = { package = "bitcoin-units", version = "0.1.0", default-features = false, features = ["alloc"] }
diff --git a/units/Cargo.toml b/units/Cargo.toml
index 51b968d1..157f3082 100644
--- a/units/Cargo.toml
+++ b/units/Cargo.toml
@@ -22,7 +22,7 @@ all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
-internals = { package = "bitcoin-internals", version = "0.3.0" }
+internals = { package = "bitcoin-internals", version = "0.3.0", features = ["alloc"] }
 
 serde = { version = "1.0.103", default-features = false, features = ["derive"], optional = true }