diff --git a/build-constraints.yaml b/build-constraints.yaml
index bf67b00c..28194eba 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -44,7 +44,7 @@ packages:
         - primitive-offset
         - primitive-unlifted
         - run-st
-        - small-bytearray-builder
+        - small-bytearray-builder < 0.3.0.0 # #4919
 
     "Robert Vollmert <rob@vllmrt.net> @robx":
         - configurator-pg
@@ -3824,8 +3824,8 @@ packages:
 
     "Matthew Farkas-Dyck <strake888@gmail.com> @strake":
         - Fin
-        - alg
-        - category
+        - alg < 0.2.12.0 # depends on dual #4918
+        - category < 0.2.4.2 # depends on dual #4918
         - constraint
         - either-both
         - filtrable