diff --git a/build-constraints.yaml b/build-constraints.yaml
index b97dcb43..d3bb8cdf 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5335,7 +5335,7 @@ packages:
         - classy-prelude
         - classy-prelude-conduit
         - clientsession
-        - cmark-gfm < 0.6.1
+        - cmark-gfm < 0.2.6
         - colour
         - colourista
         - commutative-semigroups