diff --git a/.moban.d/custom_travis.yml.jj2 b/.moban.d/custom_travis.yml.jj2
index 9a18ae8..28d0904 100644
--- a/.moban.d/custom_travis.yml.jj2
+++ b/.moban.d/custom_travis.yml.jj2
@@ -5,6 +5,7 @@ env:
 {%endblock%}
 {%block custom_python_versions%}
 python:
+  - 3.9
   - 3.8
   - 3.7
   - 3.6
diff --git a/.travis.yml b/.travis.yml
index 208ab50..6621a9e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ language: python
 notifications:
   email: false
 python:
+  - 3.9
   - 3.8
   - 3.7
   - 3.6
diff --git a/pyexcel_io/utils.py b/pyexcel_io/utils.py
index 65477a0..ec5f538 100644
--- a/pyexcel_io/utils.py
+++ b/pyexcel_io/utils.py
@@ -27,8 +27,8 @@
 AVAILABLE_READERS = {
     constants.FILE_FORMAT_CSV: [IO_ITSELF],
     constants.FILE_FORMAT_XLS: [XLS_PLUGIN],
-    constants.FILE_FORMAT_XLSX: [XLS_PLUGIN, XLSX_PLUGIN],
-    constants.FILE_FORMAT_XLSM: [XLS_PLUGIN, XLSX_PLUGIN],
+    constants.FILE_FORMAT_XLSX: [XLSX_PLUGIN, XLS_PLUGIN],
+    constants.FILE_FORMAT_XLSM: [XLSX_PLUGIN, XLS_PLUGIN],
     constants.FILE_FORMAT_ODS: [ODS_PLUGIN, ODS3_PLUGIN, ODSR_PLUGIN],
     constants.FILE_FORMAT_TSV: [IO_ITSELF],
     constants.FILE_FORMAT_CSVZ: [IO_ITSELF],