diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d1a35e74..cee51b5a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -114,7 +114,7 @@ jobs:
       - run: df -h
 
       - name: DEBUG build non-test images tests
-        run: node_modules/.bin/synthetic-chain build
+        run: yarn build
 
       - run: docker system df
       - run: docker buildx du --verbose
@@ -123,7 +123,7 @@ jobs:
       # Test before pushing the images.
       - name: Build and run proposal tests
         if: ${{ matrix.platform == env.X86_PLATFORM }}
-        run: node_modules/.bin/synthetic-chain test
+        run: yarn test
 
       - run: docker system df
       - run: docker buildx du --verbose
diff --git a/README.md b/README.md
index 16f08947..c50f9d7b 100644
--- a/README.md
+++ b/README.md
@@ -63,21 +63,21 @@ A known issue is that `yarn synthetic-chain` files with `Unknown file extension
 To build the test images,
 
 ```
-node_modules/.bin/synthetic-chain build
+tsx packages/synthetic-chain build
 ```
 
 To build the test images for particular proposals,
 
 ```
 # build just upgrades
-node_modules/.bin/synthetic-chain build --match upgrade
+tsx packages/synthetic-chain build --match upgrade
 ```
 
 To run the tests for particular proposals,
 
 ```
 # build just upgrades
-node_modules/.bin/synthetic-chain test --match upgrade
+tsx packages/synthetic-chain test --match upgrade
 ```
 
 ## Debugging
diff --git a/package.json b/package.json
index bc109770..01f39ae2 100644
--- a/package.json
+++ b/package.json
@@ -4,8 +4,8 @@
     "packages/*"
   ],
   "scripts": {
-    "build": "echo Use synthetic-chain to build proposal images",
-    "test": "echo Use synthetic-chain to test proposal images",
+    "build": "tsx packages/synthetic-chain build",
+    "test": "tsx packages/synthetic-chain test",
     "format": "prettier --write ."
   },
   "dependencies": {