diff --git a/build-constraints.yaml b/build-constraints.yaml
index 71748538..266483c8 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -25,8 +25,7 @@ packages:
         - zstd
 
     "Jacek Galowicz <jacek@galowicz.de> @tfc":
-        []
-        # - hamtsolo # conduit 1.3 https://github.com/tfc/hamtsolo/issues/3
+        - hamtsolo
 
     "Ferdinand van Walree <ferdinandvwalree@gmail.com> @Ferdinand-vW":
         []
@@ -3286,7 +3285,6 @@ packages:
         - dom-parser < 0 # build failure with GHC 8.4 https://github.com/typeable/dom-parser/issues/10
         - enummapset < 0 # build failure with GHC 8.4 https://github.com/michalt/enummapset/issues/11
         - fb < 0 # build failure with GHC 8.4 https://github.com/psibi/fb/issues/3
-        - hamtsolo < 0 # build failure with conduit 1.3 https://github.com/tfc/hamtsolo/issues/3
         - hashtables < 0 # build failure with GHC 8.4 https://github.com/gregorycollins/hashtables/issues/45
         - haskell-neo4j-client < 0 # build failure with GHC 8.4 https://github.com/asilvestre/haskell-neo4j-rest-client/issues/32
         - heap < 0 # build failure with GHC 8.4 https://github.com/pruvisto/heap/issues/5