diff --git a/build-constraints.yaml b/build-constraints.yaml
index ef55000c..6e182c01 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -133,7 +133,7 @@ packages:
         - PyF
 
     "Erik Schnetter <schnetter@gmail.com> @eschnett":
-        - mpi-hs < 0 # https://github.com/commercialhaskell/stackage/issues/5278
+        - mpi-hs
 
     "Yang Bo <pop.atry@gmail.com> @Atry":
         - control-dsl < 0 # via doctest-discover
diff --git a/debian-bootstrap.sh b/debian-bootstrap.sh
index cb9556f3..05b9aa96 100755
--- a/debian-bootstrap.sh
+++ b/debian-bootstrap.sh
@@ -92,13 +92,13 @@ apt-get install -y \
     libmono-2.0-dev \
     libmp3lame-dev \
     libmpfr-dev \
+    libmpich-dev \
     libmysqlclient-dev \
     libncurses5-dev \
     libnfc-dev \
     liboath-dev \
     libnotify-dev \
     libopenal-dev \
-    libopenmpi-dev \
     libpango1.0-dev \
     libpcap0.8-dev \
     libpcre2-dev \