diff --git a/mmocr/__init__.py b/mmocr/__init__.py
index faf1ae81e..1413bd2b5 100644
--- a/mmocr/__init__.py
+++ b/mmocr/__init__.py
@@ -47,7 +47,7 @@
 mmdet_version = digit_version(mmdet.__version__)
 
 assert (mmdet_version >= digit_version(mmdet_minimum_version)
-        and mmdet_version < digit_version(mmdet_maximum_version)), \
+        and mmdet_version <= digit_version(mmdet_maximum_version)), \
     f'MMDetection {mmdet.__version__} is incompatible ' \
     f'with MMOCR {__version__}. ' \
     f'Please use MMDetection >= {mmdet_minimum_version}, ' \