diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 18319f60..20d74435 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -22,7 +22,7 @@ jobs:
       # temporary until it's in a release
       - run: opam pin https://github.com/ocaml-multicore/picos.git -y -n
 
-      - run: opam install odig moonpool moonpool-lwt
+      - run: opam install odig moonpool moonpool-lwt moonpool-io
 
       - run: opam exec -- odig odoc --cache-dir=_doc/ moonpool moonpool-lwt
 
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 00bb6095..a16fe420 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -32,7 +32,7 @@ jobs:
       # temporary until it's in a release
       - run: opam pin https://github.com/ocaml-multicore/picos.git -y -n
 
-      - run: opam install -t moonpool moonpool-lwt --deps-only
+      - run: opam install -t moonpool moonpool-lwt moonpool-io --deps-only
         if: matrix.ocaml-compiler == '5.2'
       - run: opam install -t moonpool --deps-only
         if: matrix.ocaml-compiler != '5.2'
@@ -68,7 +68,7 @@ jobs:
       # temporary until it's in a release
       - run: opam pin https://github.com/ocaml-multicore/picos.git -y -n
 
-      - run: opam install -t moonpool moonpool-lwt --deps-only
+      - run: opam install -t moonpool moonpool-lwt moonpool-io --deps-only
       - run: opam exec -- dune build @install
       # install some depopts
       - run: opam install thread-local-storage trace domain-local-await