diff --git a/CITATION.cff b/CITATION.cff
index 73e1ff77..87209bdf 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -5,6 +5,6 @@ authors:
     given-names: Erik
     orcid: 0000-0002-4518-9017
 title: MPItrampoline
-version: v3.5.1
+version: v3.6.0
 doi: 10.5281/zenodo.6174408
-date-released: 2022-02-24
+date-released: 2022-02-25
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9459d844..bbe6b533 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.12...3.20)
 project(
-  MPItrampoline VERSION 3.5.1
+  MPItrampoline VERSION 3.6.0
   DESCRIPTION "MPI trampoline"
   HOMEPAGE_URL "https://github.com/eschnett/MPItrampoline"
   LANGUAGES NONE
diff --git a/mpi_constants.py b/mpi_constants.py
index 3066b193..a3ab47ab 100755
--- a/mpi_constants.py
+++ b/mpi_constants.py
@@ -170,6 +170,7 @@
 
     ("char ***", "MPI_ARGVS_NULL"),
 
+    ("int *", "MPI_ERRCODES_IGNORE"),
     ("int *", "MPI_UNWEIGHTED"),
     ("int *", "MPI_WEIGHTS_EMPTY"),
 
@@ -186,8 +187,11 @@
 
     ("MPI_Comm_delete_attr_function *", "MPI_COMM_NULL_DELETE_FN"),
 
+    ("MPI_Copy_function *", "MPI_DUP_FN"),
     ("MPI_Copy_function *", "MPI_NULL_COPY_FN"),
 
+    ("MPI_Datarep_conversion_function *", "MPI_CONVERSION_FN_NULL"),
+
     # ("MPI_Datatype", "MPI_2COMPLEX"),
     # ("MPI_Datatype", "MPI_2DOUBLE"),
     # ("MPI_Datatype", "MPI_2DOUBLE_COMPLEX"),
diff --git a/mpiabi.h b/mpiabi.h
index 33cce333..2c51c7c5 100644
--- a/mpiabi.h
+++ b/mpiabi.h
@@ -19,7 +19,7 @@
 // MPI ABI version (we use SemVer)
 
 #define MPIABI_VERSION_MAJOR 2
-#define MPIABI_VERSION_MINOR 3
+#define MPIABI_VERSION_MINOR 4
 #define MPIABI_VERSION_PATCH 0
 
 // Compile-time constants