diff --git a/CHANGES b/CHANGES
index a19220a382a..844fffde6af 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,27 @@
+===============================================================================
+                               Changes in 4.2.2
+===============================================================================
+
+# Update embedded libfabric to v1.20.1 and fix compilation with GCC 14.
+
+# Fix dataloop support for MPIX_Type_iov routines
+
+# Fix crash in Hydra when system has many local ip addresses
+
+# Fix RMA fallback check in ch4:ofi netmod
+
+# Fix MPI_UNDEFINED handling in mpi_f08 module
+
+# Fix Slurm environment variable inheritance in Hydra
+
+# Fix multiple issues with large count support in ROMIO
+
+# Fix potential hang in init using PMIx client and nonstandard keys
+
+# Fix crash if PMIx client cannot get appnum from server during init
+
+# Fix other build errors and warnings
+
 ===============================================================================
                                Changes in 4.2.1
 ===============================================================================
diff --git a/maint/version.m4 b/maint/version.m4
index 84071229f5b..4e4b472c1da 100644
--- a/maint/version.m4
+++ b/maint/version.m4
@@ -14,7 +14,7 @@
 # changing this by playing with diversions, but then we would probably be
 # playing with autotools-fire.
 
-m4_define([MPICH_VERSION_m4],[4.2.1])dnl
+m4_define([MPICH_VERSION_m4],[4.2.2])dnl
 m4_define([MPICH_RELEASE_DATE_m4],[unreleased development copy])dnl
 
 # For libtool ABI versioning rules see:
@@ -36,7 +36,7 @@ m4_define([MPICH_RELEASE_DATE_m4],[unreleased development copy])dnl
 # standard, and does not include MPIX_ functions and C++ bindings.
 
 # Use [0:0:0] for unstable (e.g. alpha and beta) releases.
-# last version: 4.2.1 - 16:1:4
+# last version: 4.2.2 - 16:2:4
 
 m4_define([libmpi_so_version_m4],[0:0:0])dnl
 
diff --git a/modules/libfabric b/modules/libfabric
index db9ff1bdbdb..f37dbb95da8 160000
--- a/modules/libfabric
+++ b/modules/libfabric
@@ -1 +1 @@
-Subproject commit db9ff1bdbdb1d6f70fa216a626face5f6a902a7e
+Subproject commit f37dbb95da86f40094283972c4ee3323abdc8342
diff --git a/src/mpi/datatype/typerep/src/typerep_dataloop_iov.c b/src/mpi/datatype/typerep/src/typerep_dataloop_iov.c
index daea200bdcb..a8f715a6989 100644
--- a/src/mpi/datatype/typerep/src/typerep_dataloop_iov.c
+++ b/src/mpi/datatype/typerep/src/typerep_dataloop_iov.c
@@ -38,12 +38,22 @@ int MPIR_Typerep_to_iov_offset(const void *buf, MPI_Aint count, MPI_Datatype typ
 {
     int mpi_errno = MPI_SUCCESS;
 
+    int is_contig;
+    MPI_Aint typesize;
     if (HANDLE_IS_BUILTIN(type)) {
-        MPI_Aint typesize;
+        is_contig = 1;
         typesize = MPIR_Datatype_get_basic_size(type);
+    } else {
+        MPIR_Datatype *dt_ptr;
+        MPIR_Datatype_get_ptr(type, dt_ptr);
+        is_contig = dt_ptr->is_contig;
+        typesize = dt_ptr->size;
+    }
+
+    if (is_contig) {
         if (max_iov_len >= 1) {
             iov[0].iov_base = (char *) buf;
-            iov[0].iov_len = typesize;
+            iov[0].iov_len = typesize * count;
             *actual_iov_len = 1;
         } else {
             *actual_iov_len = 0;
@@ -84,7 +94,7 @@ int MPIR_Typerep_iov_len(MPI_Aint count, MPI_Datatype type, MPI_Aint max_iov_byt
     }
 
     if (max_iov_bytes >= count * type_size) {
-        *iov_len = count * num_contig;
+        *iov_len = is_contig ? 1 : count * num_contig;
         if (actual_iov_bytes) {
             *actual_iov_bytes = count * type_size;
         }
diff --git a/src/mpi/datatype/typerep/src/typerep_dataloop_pack.c b/src/mpi/datatype/typerep/src/typerep_dataloop_pack.c
index 8a9b4a01c03..1d2a1d9c909 100644
--- a/src/mpi/datatype/typerep/src/typerep_dataloop_pack.c
+++ b/src/mpi/datatype/typerep/src/typerep_dataloop_pack.c
@@ -8,6 +8,12 @@
 #include "typerep_pre.h"
 #include "typerep_internal.h"
 
+int MPIR_Typerep_test(MPIR_Typerep_req typerep_req, int *completed)
+{
+    *completed = 1;
+    return MPI_SUCCESS;
+}
+
 int MPIR_Typerep_icopy(void *outbuf, const void *inbuf, MPI_Aint num_bytes,
                        MPIR_Typerep_req * typerep_req, uint32_t flags)
 {
diff --git a/src/mpid/ch4/netmod/ofi/ofi_rma.h b/src/mpid/ch4/netmod/ofi/ofi_rma.h
index 15d2ffba128..c288145ad74 100644
--- a/src/mpid/ch4/netmod/ofi/ofi_rma.h
+++ b/src/mpid/ch4/netmod/ofi/ofi_rma.h
@@ -54,7 +54,7 @@ MPL_STATIC_INLINE_PREFIX int MPIDI_OFI_gpu_rma_enabled(const void *ptr)
                 return 0;
         }
     }
-    return 0;
+    return 1;
 }
 
 MPL_STATIC_INLINE_PREFIX void MPIDI_OFI_query_acc_atomic_support(MPI_Datatype dt, int query_type,