diff --git a/.github/workflows/deploy_docc.yml b/.github/workflows/deploy_docc.yml
index d3f4ec5..02ae1ec 100644
--- a/.github/workflows/deploy_docc.yml
+++ b/.github/workflows/deploy_docc.yml
@@ -25,13 +25,15 @@ jobs:
 
       - name: Build DocC
         run: |
-          swift package --allow-writing-to-directory ./docs \
-            generate-documentation \
-            --target WebUI \
-            --disable-indexing \
-            --transform-for-static-hosting \
-            --hosting-base-path WebUI \
-            --output-path ./docs
+          $(xcrun --find docc) convert Sources/WebUI/Documentation.docc \
+            --fallback-display-name WebUI \
+            --fallback-bundle-identifier org.cybozu.WebUI \
+            --fallback-bundle-version 1 \
+            --output-dir Reference.doccarchive
+
+          $(xcrun --find docc) process-archive \
+             transform-for-static-hosting Reference.doccarchive \
+             --output-path ./docs
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
diff --git a/Package.resolved b/Package.resolved
deleted file mode 100644
index 10155ea..0000000
--- a/Package.resolved
+++ /dev/null
@@ -1,23 +0,0 @@
-{
-  "pins" : [
-    {
-      "identity" : "swift-docc-plugin",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/apple/swift-docc-plugin.git",
-      "state" : {
-        "revision" : "26ac5758409154cc448d7ab82389c520fa8a8247",
-        "version" : "1.3.0"
-      }
-    },
-    {
-      "identity" : "swift-docc-symbolkit",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/apple/swift-docc-symbolkit",
-      "state" : {
-        "revision" : "b45d1f2ed151d057b54504d653e0da5552844e34",
-        "version" : "1.0.0"
-      }
-    }
-  ],
-  "version" : 2
-}
diff --git a/Package.swift b/Package.swift
index 3e8043d..dcea3e8 100644
--- a/Package.swift
+++ b/Package.swift
@@ -19,9 +19,6 @@ let package = Package(
             targets: ["WebUI"]
         )
     ],
-    dependencies: [
-        .package(url: "https://github.com/apple/swift-docc-plugin.git", exact: "1.4.3")
-    ],
     targets: [
         .target(
             name: "WebUI",