diff --git a/runtime/filetype.vim b/runtime/filetype.vim
index 56df5d6..b5262d1 100644
--- a/runtime/filetype.vim
+++ b/runtime/filetype.vim
@@ -338,6 +338,10 @@
   au BufNewFile,BufRead *.C,*.H setf cpp
 endif
 
+" C++ 20 modules (clang)
+" https://clang.llvm.org/docs/StandardCPlusPlusModules.html#file-name-requirement
+au BufNewFile,BufRead *.cppm,*.ccm,*.cxxm,*.c++m setf cpp
+
 " .h files can be C, Ch C++, ObjC or ObjC++.
 " Set c_syntax_for_h if you want C, ch_syntax_for_h if you want Ch. ObjC is
 " detected automatically.
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index af2969d..0b8b52c 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -127,7 +127,7 @@
     \ 'context': ['tex/context/any/file.tex', 'file.mkii', 'file.mkiv', 'file.mkvi', 'file.mkxl', 'file.mklx'],
     \ 'cook': ['file.cook'],
     \ 'cpon': ['file.cpon'],
-    \ 'cpp': ['file.cxx', 'file.c++', 'file.hh', 'file.hxx', 'file.hpp', 'file.ipp', 'file.moc', 'file.tcc', 'file.inl', 'file.tlh'],
+    \ 'cpp': ['file.cxx', 'file.c++', 'file.hh', 'file.hxx', 'file.hpp', 'file.ipp', 'file.moc', 'file.tcc', 'file.inl', 'file.tlh', 'file.cppm', 'file.ccm', 'file.cxxm', 'file.c++m'],
     \ 'cqlang': ['file.cql'],
     \ 'crm': ['file.crm'],
     \ 'crontab': ['crontab', 'crontab.file', '/etc/cron.d/file', 'any/etc/cron.d/file'],
diff --git a/src/version.c b/src/version.c
index 9a50ab0..50773f8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1455,
+/**/
     1454,
 /**/
     1453,