diff --git a/build-constraints.yaml b/build-constraints.yaml
index 21574e82..56450fc9 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3022,7 +3022,7 @@ packages:
     "Justus Adam <dev@justus.science> @JustusAdam":
         - marvin
         - marvin-interpolate
-        - mustache
+        - mustache < 0 # https://github.com/JustusAdam/mustache/issues/58
         - exit-codes >= 1.0.0
 
     "Cindy Wang <cindylinz@gmail.com> @CindyLinz":
@@ -4555,7 +4555,7 @@ packages:
         - multi-containers
 
     "Vaclav Svejcar <vaclav.svejcar@gmail.com> @vaclavsvejcar":
-        - headroom
+        - headroom < 0 # via mustache
         - vcs-ignore
 
     "Adrian Sieber <stackage@ad-si.com> @ad-si":