diff --git a/P/PMIx/build_tarballs.jl b/P/PMIx/build_tarballs.jl
index 020355f3b55..b7f48eb7b4a 100644
--- a/P/PMIx/build_tarballs.jl
+++ b/P/PMIx/build_tarballs.jl
@@ -3,12 +3,12 @@
 using BinaryBuilder, Pkg
 
 name = "PMIx"
-version = v"4.2.7"
+version = v"4.2.9"
 
 # Collection of sources required to complete build
 sources = [
     ArchiveSource("https://github.com/openpmix/openpmix/releases/download/v$(version)/pmix-$(version).tar.bz2",
-                  "ac9cf58a0bf01bfacd51d342100234f04c740ec14257e4492d1dd0207ff2a917")
+                  "6b11f4fd5c9d7f8e55fc6ebdee9af04b839f44d06044e58cea38c87c168784b3")
 ]
 
 # Bash recipe for building across all platforms
@@ -33,6 +33,9 @@ make install
 # platforms are passed in on the command line
 platforms = supported_platforms()
 
+# PMIx does not support 32-bit builds <https://docs.openpmix.org/en/latest/release-notes/platform.html>
+filter!(p -> nbits(p) != 32, platforms)
+
 # FreeBSD does not provide `pthread_setaffinity_np` which is a GNU extension
 filter!(!Sys.isfreebsd, platforms)