diff --git a/build/environment.yml b/build/environment.yml
index d6f66fdf..d46755a7 100644
--- a/build/environment.yml
+++ b/build/environment.yml
@@ -21,7 +21,7 @@ dependencies:
   - pip:
     - cffi==1.15.0
     - errorhandler==2.0.1
-    - git+https://github.com/manubot/manubot@6e6f6a5aac381120faf3ef02e594b5babc77da2b
+    - git+https://github.com/manubot/manubot@e1b1646be3951556915a9ff1dc6080521509ae30
     - isbnlib==3.10.10
     - opentimestamps-client==0.7.1
     - opentimestamps==0.4.3