diff --git a/cmake/backports/FindPythonInterp.cmake b/cmake/backports/FindPythonInterp.cmake
index 634c1852633..20eb7aebb37 100644
--- a/cmake/backports/FindPythonInterp.cmake
+++ b/cmake/backports/FindPythonInterp.cmake
@@ -79,7 +79,7 @@ unset(_Python_NAMES)
 
 set(_PYTHON1_VERSIONS 1.6 1.5)
 set(_PYTHON2_VERSIONS 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0)
-set(_PYTHON3_VERSIONS 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0)
+set(_PYTHON3_VERSIONS 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0)
 
 if(PythonInterp_FIND_VERSION)
     if(PythonInterp_FIND_VERSION_COUNT GREATER 1)