diff --git a/client/package.json b/client/package.json
index ff631095..f409b0db 100644
--- a/client/package.json
+++ b/client/package.json
@@ -14,7 +14,7 @@
     "react-router-dom": "^5.3.3",
     "react-use-websocket": "^2.9.1",
     "sass": "^1.57.1",
-    "shared": "*",
+    "shared": "file:../shared",
     "use-sound": "^4.0.1",
     "uswds": "^2.13.3"
   },
diff --git a/server/package.json b/server/package.json
index a42ad8cf..64666cad 100644
--- a/server/package.json
+++ b/server/package.json
@@ -25,7 +25,7 @@
     "sequelize-auto": "^0.5.4",
     "sequelize-cli": "^6.4.1",
     "sequelize-fixtures": "^1.2.0",
-    "shared": "*",
+    "shared": "file:../shared",
     "supertest": "^4.0.2",
     "supertest-session": "^4.1.0",
     "utf-8-validate": "^5.0.9",
diff --git a/shared/README.md b/shared/README.md
index 4d3910bb..b3d59014 100644
--- a/shared/README.md
+++ b/shared/README.md
@@ -5,3 +5,14 @@ These files are shared by both the `client` and `server` packages. The `shared`
 If you want to make a change in the shared code and then test it the client or server, run `yarn upgrade shared` from the root `/app` directory in the docker instance. This should cause yarn to copy the latest files from the `shared` package to the root `/node_modules/shared/` directory that's used by the client and server.
 
 If you're making lots of changes to `shared` and want to quickly test them, using [`yarn link`](https://classic.yarnpkg.com/lang/en/docs/cli/link/) may be easier.
+
+
+##  Using `*` instead of `file:../shared` doesn't work
+
+In theory, you should be able to add the `shared` package to others in the monorepo by adding `"shared": "*"` to their `package.json` files.  This would link the package, so that any changes to `shared` would immediately be available in the other packages.
+
+But using `*` instead of `file:../shared` causes a Rollup error during the build: `RollupError: "DeliveryStatus" is not exported by "../shared/constants/index.js", imported by "src/Models/Ringdown.js".`
+
+This seems to be related to the fact that the `shared` package is in CJS format and has to get optimized during the dev serving process, thanks to the `optimizeDeps.include` array in the Vite config.  But that during doesn't work during build, and various attempts at changing the `build.commonjsOptions` flags haven't worked.  It also seems to be related to [this Vite bug](https://github.com/vitejs/vite/issues/2679).
+
+So it seems simplest to use the `file:` format for specifying the version of `shared` for now, until it can get rewritten as an ES module.  (Also note that you have to re-run yarn after making changes to the package.json file; otherwise things may look like they're working, even though they won't during CI/CD.)
diff --git a/shared/constants/index.js b/shared/constants/index.js
index f22046bb..0777adb3 100644
--- a/shared/constants/index.js
+++ b/shared/constants/index.js
@@ -1 +1 @@
-exports.DeliveryStatus = require('./DeliveryStatus');
+module.exports.DeliveryStatus = require('./DeliveryStatus');
diff --git a/shared/index.js b/shared/index.js
index 14d3d9e9..3f59d233 100644
--- a/shared/index.js
+++ b/shared/index.js
@@ -1,4 +1,4 @@
-exports = {
-  ...require('./constants'),
-  ...require('./metadata')
+module.exports = {
+  constants: require('./constants'),
+  metadata: require('./metadata')
 };
diff --git a/yarn.lock b/yarn.lock
index 2b43e5fb..f9b9e6e7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5452,6 +5452,9 @@ setprototypeof@1.2.0:
   resolved "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz"
   integrity sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==
 
+"shared@file:shared":
+  version "0.1.0"
+
 shebang-command@^2.0.0:
   version "2.0.0"
   resolved "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz"