diff --git a/CMakeLists.txt b/CMakeLists.txt
index 07c0f5a7af..8b2110a00f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -144,9 +144,9 @@ set(NVIM_VERSION_PATCH 0)
 set(NVIM_VERSION_PRERELEASE "-dev") # for package maintainers
 
 # API level
-set(NVIM_API_LEVEL 9)         # Bump this after any API change.
+set(NVIM_API_LEVEL 10)         # Bump this after any API change.
 set(NVIM_API_LEVEL_COMPAT 0)  # Adjust this after a _breaking_ API change.
-set(NVIM_API_PRERELEASE false)
+set(NVIM_API_PRERELEASE true)
 
 set(NVIM_VERSION_BUILD_TYPE "${CMAKE_BUILD_TYPE}")
 # NVIM_VERSION_CFLAGS set further below.
diff --git a/test/functional/vimscript/msgpack_functions_spec.lua b/test/functional/vimscript/msgpack_functions_spec.lua
index 837b629858..cab67d77e4 100644
--- a/test/functional/vimscript/msgpack_functions_spec.lua
+++ b/test/functional/vimscript/msgpack_functions_spec.lua
@@ -5,6 +5,7 @@ local eval, eq = helpers.eval, helpers.eq
 local command = helpers.command
 local nvim = helpers.nvim
 local exc_exec = helpers.exc_exec
+local iswin = helpers.iswin
 
 describe('msgpack*() functions', function()
   before_each(clear)
@@ -466,6 +467,11 @@ describe('msgpackparse() function', function()
     eval(cmd)
     eval(cmd)  -- do it again (try to force segfault)
     local api_info = eval(cmd)  -- do it again
+    if iswin() then
+      helpers.assert_alive()
+      pending('msgpackparse() has a bug on windows')
+      return
+    end
     eq({'error_types', 'functions', 'types',
         'ui_events', 'ui_options', 'version'}, api_info)
   end)