diff --git a/.github/workflows/UnitTests.yml b/.github/workflows/UnitTests.yml
index 1c5579d5d..3b4f3eeda 100644
--- a/.github/workflows/UnitTests.yml
+++ b/.github/workflows/UnitTests.yml
@@ -92,10 +92,9 @@ jobs:
         julia_version:
         - "1"
         include:
-          # MPICH with MPI ABI is broken on i686: <https://github.com/pmodels/mpich/issues/7770>.
-          # - julia_arch: "x86"
-          #   os: "ubuntu-24.04"
-          #   julia_version: "1"
+          - julia_arch: "x86"
+            os: "ubuntu-24.04"
+            julia_version: "1"
           - julia_arch: "default"
             os: "ubuntu-24.04"
             julia_version: "min"
diff --git a/Project.toml b/Project.toml
index d0f0f0f56..7b8aaa99d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -24,7 +24,7 @@ AMDGPU = "0.6, 0.7, 0.8, 0.9, 1, 2"
 CUDA = "3, 4, 5, 6"
 DocStringExtensions = "0.8, 0.9"
 Libdl = "1"
-MPIABI_jll = "0.1.1"
+MPIABI_jll = "0.1.5"
 MPICH_jll = "4, 5"
 MPIPreferences = "0.1.8"
 MPItrampoline_jll = "5"