diff --git a/.github/workflows/openbsd-build.yml b/.github/workflows/openbsd-build.yml
index 0ad40b77..43b93861 100644
--- a/.github/workflows/openbsd-build.yml
+++ b/.github/workflows/openbsd-build.yml
@@ -29,7 +29,7 @@ jobs:
               meson ninja pkgconf gmake \
               gettext-tools \
               glib2 gtk+2 dbus-glib libcanberra \
-              luajit openssl
+              luajit mono libgdiplus openssl
             cd "$GITHUB_WORKSPACE"
             rm -rf build staging artifacts
             meson setup build \