diff --git a/.github/requirements.txt b/.github/requirements.txt
index 116b5c00..0b3a7b4e 100644
--- a/.github/requirements.txt
+++ b/.github/requirements.txt
@@ -1,3 +1,3 @@
-tutor[full]<19
+tutor[full]<19,>18
 setuptools
 git+https://github.com/hastexo/tutor-contrib-s3@v1.4.0