diff --git a/apps/web/src/lib/workspace-boundary.test.ts b/apps/web/src/lib/workspace-boundary.test.ts
index 2f1bfb1..38a3f1b 100644
--- a/apps/web/src/lib/workspace-boundary.test.ts
+++ b/apps/web/src/lib/workspace-boundary.test.ts
@@ -74,6 +74,21 @@ describe("workspace boundaries", () => {
     );
   });
 
+  test("accounts for local env files in cacheable Vite and Storybook task hashes", () => {
+    const turboConfig = JSON.parse(
+      readFileSync(join(root, "turbo.json"), "utf8"),
+    ) as {
+      tasks?: Record<string, { inputs?: string[] }>;
+    };
+
+    for (const taskName of ["build", "build-storybook"]) {
+      expect(turboConfig.tasks?.[taskName]?.inputs).toEqual([
+        "$TURBO_DEFAULT$",
+        ".env*",
+      ]);
+    }
+  });
+
   test("keeps the website app and reusable UI library as separate packages", () => {
     const webPackage = JSON.parse(
       readFileSync(join(root, "apps/web/package.json"), "utf8"),
diff --git a/turbo.json b/turbo.json
index f2d3137..e1b2e7c 100644
--- a/turbo.json
+++ b/turbo.json
@@ -9,6 +9,7 @@
   "tasks": {
     "build": {
       "dependsOn": ["^build"],
+      "inputs": ["$TURBO_DEFAULT$", ".env*"],
       "outputs": ["dist/**", "build/**"],
       "env": ["NODE_ENV", "VITE_*"]
     },
@@ -29,6 +30,7 @@
     },
     "build-storybook": {
       "dependsOn": ["^build"],
+      "inputs": ["$TURBO_DEFAULT$", ".env*"],
       "outputs": ["storybook-static/**"],
       "env": ["NODE_ENV", "STORYBOOK_*", "VITE_*"]
     },