diff --git a/tensorpack/docs/requirements.txt b/tensorpack/docs/requirements.txt
index c561f2b..29bb121 100644
--- a/tensorpack/docs/requirements.txt
+++ b/tensorpack/docs/requirements.txt
@@ -5,4 +5,4 @@ Sphinx>=1.6
 recommonmark==0.4.0
 sphinx_rtd_theme
 mock
-tensorflow==1.15.4
+tensorflow==2.6.4