diff --git a/.github/workflows/pretest.yaml b/.github/workflows/pretest.yaml
index b7b9dc9..e7d9334 100644
--- a/.github/workflows/pretest.yaml
+++ b/.github/workflows/pretest.yaml
@@ -15,8 +15,15 @@ jobs:
             FROM project-dev
             ADD . /project
 
-            # create an empty file to make `go:embed` happy              
-            RUN cd /project && mkdir app/frontend/build && touch app/frontend/build/test && mkdir docs/build && touch docs/build/test
+            # create empty files to make `go:embed` happy              
+            RUN \
+              cd /project && \
+              mkdir app/frontend/build && \
+              touch app/frontend/build/test && \
+              mkdir docs/build && \
+              touch docs/build/test && \
+              mkdir app/yjs-server/bin && \
+              touch app/yjs-server/bin/yjs-server
 
             # generate code
             RUN cd /project && task openapi && task proto
diff --git a/Taskfile.yaml b/Taskfile.yaml
index 1198546..62a81e8 100644
--- a/Taskfile.yaml
+++ b/Taskfile.yaml
@@ -54,6 +54,7 @@ tasks:
   build-dev:
     cmds:
       - rm -f build/nutsh-dev
+      - task: yjs:build
       - task: frontend:build-dev
       - task: backend:build
       - mv build/nutsh build/nutsh-dev