diff --git a/buildpack.toml b/buildpack.toml
index 383644a..a1f02c0 100644
--- a/buildpack.toml
+++ b/buildpack.toml
@@ -44,7 +44,7 @@ api = "0.7"
     purl = "pkg:generic/rust@1.73.0"
     sha256 = "aa4cf0b7e66a9f5b7c623d4b340bb1ac2864a5f2c2b981f39f796245dc84f2cb"
     source = "https://static.rust-lang.org/dist/rustc-1.73.0-src.tar.gz"
-    source_sha256 = "96d62e6d1f2d21df7ac8acb3b9882411f9e7c7036173f7f2ede9e1f1f6b1bb3a"
+    source-sha256 = "96d62e6d1f2d21df7ac8acb3b9882411f9e7c7036173f7f2ede9e1f1f6b1bb3a"
     stacks = ["io.buildpacks.stacks.bionic", "io.paketo.stacks.tiny", "*"]
     uri = "https://static.rust-lang.org/dist/rust-1.73.0-x86_64-unknown-linux-gnu.tar.gz"
     version = "1.73.0"