diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 51187fd9..29ef55e1 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -20,10 +20,10 @@ jobs:
           allow-prerelease-opam: true
 
       - name: Deps
-        run: opam install odig tiny_httpd tiny_httpd_camlzip
+        run: opam install odig tiny_httpd tiny_httpd_camlzip tiny_httpd_eio
 
       - name: Build
-        run: opam exec -- odig odoc --cache-dir=_doc/ tiny_httpd tiny_httpd_camlzip
+        run: opam exec -- odig odoc --cache-dir=_doc/ tiny_httpd tiny_httpd_camlzip tiny_httpd_eio
 
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 712f1fca..a5d9a22e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -38,7 +38,7 @@ jobs:
 
       - run: opam install ./tiny_httpd.opam ./tiny_httpd_camlzip.opam --deps-only --with-test
 
-      - run: opam exec -- dune build @install -p tiny_httpd,tiny_httpd_camlzip
+      - run: opam exec -- dune build @install -p tiny_httpd,tiny_httpd_camlzip,tiny_httpd_eio
 
       - run: opam exec -- dune build @src/runtest @examples/runtest @tests/runtest -p tiny_httpd
         if: ${{ matrix.os == 'ubuntu-latest' }}
@@ -50,4 +50,4 @@ jobs:
 
       - run: opam install logs magic-mime -y
 
-      - run: opam exec -- dune build @install -p tiny_httpd,tiny_httpd_camlzip
+      - run: opam exec -- dune build @install -p tiny_httpd,tiny_httpd_camlzip,tiny_httpd_eio