diff --git a/.github/workflows/build-mac.yml b/.github/workflows/build-mac.yml
index 976a086c9..14b95c208 100644
--- a/.github/workflows/build-mac.yml
+++ b/.github/workflows/build-mac.yml
@@ -13,7 +13,7 @@ jobs:
       uses: actions/checkout@v2
 
     - name: npm install
-      run: cd webapp; npm install
+      run: cd webapp; npm install --no-optional
 
     - name: Set up Go
       uses: actions/setup-go@v2
diff --git a/.github/workflows/build-ubuntu.yml b/.github/workflows/build-ubuntu.yml
index 00bf78db6..d2b26d9a9 100644
--- a/.github/workflows/build-ubuntu.yml
+++ b/.github/workflows/build-ubuntu.yml
@@ -12,7 +12,7 @@ jobs:
       uses: actions/checkout@v2
 
     - name: npm install
-      run: cd webapp; npm install
+      run: cd webapp; npm install --no-optional
 
     - name: Set up Go
       uses: actions/setup-go@v2