diff --git a/Cargo.toml b/Cargo.toml
index 2da2746..cfc330c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,7 +37,7 @@ serde_json = "1"
 uuid = { version = "1", default-features = false }
 
 # The crates in this workspace.
-foundation-arena = { path = "arena" }
+foundation-arena = { version = "0.1.0", path = "arena" }
 foundation-codecs = { path = "codecs" }
 foundation-test-vectors = { path = "test-vectors" }
 foundation-urtypes = { path = "urtypes" }