diff --git a/bin/hermit.hcl b/bin/hermit.hcl
index b429ec961..adce94e61 100644
--- a/bin/hermit.hcl
+++ b/bin/hermit.hcl
@@ -1 +1,6 @@
 manage-git = true
+
+env = {
+  "CARGO_HOME": "${HOME}/.cache/berd/cargo-home",
+  "PATH": "${HOME}/.cache/berd/cargo-home/bin:${PATH}",
+}
diff --git a/scripts/release/tests/release-scripts.test.mjs b/scripts/release/tests/release-scripts.test.mjs
index d9ca70af7..b9f2c2e73 100644
--- a/scripts/release/tests/release-scripts.test.mjs
+++ b/scripts/release/tests/release-scripts.test.mjs
@@ -128,6 +128,19 @@ describe("managed Goose build profile", () => {
   });
 });
 
+describe("shared Cargo package cache", () => {
+  it("keeps Cargo dependency and binary paths stable across worktrees", async () => {
+    const hermitConfig = await readFile(join(repo, "bin/hermit.hcl"), "utf8");
+
+    expect(hermitConfig).toMatch(
+      /"CARGO_HOME": "\$\{HOME\}\/\.cache\/berd\/cargo-home"/,
+    );
+    expect(hermitConfig).toMatch(
+      /"PATH": "\$\{HOME\}\/\.cache\/berd\/cargo-home\/bin:\$\{PATH\}"/,
+    );
+  });
+});
+
 describe("Docker Linux build environment", () => {
   it("forwards host build configuration when Docker replaces the environment", async () => {
     const dir = await tempDir();