diff --git a/docs/development/docker/petsc/Dockerfile b/docs/development/docker/petsc/Dockerfile
index 59d030bc..902aa18d 100644
--- a/docs/development/docker/petsc/Dockerfile
+++ b/docs/development/docker/petsc/Dockerfile
@@ -90,8 +90,8 @@ RUN apt-get update -qq \
 
 RUN pip3 install --no-cache-dir \
       "cython==3.0.10" \
-      "numpy<2"
-      mpi4py \
+      "numpy<2" \
+      mpi4py
 
 # get petsc
 ARG PETSC_VERSION="3.22.2"