diff --git a/.rultor.yml b/.rultor.yml
index 7d03a0e..ae19689 100644
--- a/.rultor.yml
+++ b/.rultor.yml
@@ -1,5 +1,5 @@
 docker:
-  image: yegor256/rultor-image:1.23.0
+  image: yegor256/rultor-image:1.23.1
 install: |-
   sudo tlmgr option repository ctan
   sudo tlmgr --verify-repo=none update --self