diff --git a/build-constraints.yaml b/build-constraints.yaml
index be276f80..69342809 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4728,7 +4728,7 @@ packages:
     "Michael B. Gale <github@michael-gale.co.uk> @mbg":
         - c14n
         - katip-logstash
-        - logstash
+        - logstash < 0 # https://github.com/mbg/logstash/issues/20
         - monad-logger-logstash
         - moss
         - network-wait
@@ -7282,6 +7282,7 @@ packages:
         - jvm-streaming < 0 # tried jvm-streaming-0.4.0, but its *library* requires the disabled package: distributed-closure
         - jvm-streaming < 0 # tried jvm-streaming-0.4.0, but its *library* requires the disabled package: jni
         - kanji < 0 # tried kanji-3.5.0, but its *library* requires aeson ^>=2.0 and the snapshot contains aeson-2.1.2.1
+        - katip-logstash < 0 # tried katip-logstash-0.1.0.2, but its *library* requires the disabled package: logstash
         - katip-rollbar < 0 # tried katip-rollbar-0.3.0.1, but its *library* requires aeson >=1.2 && < 1.3 and the snapshot contains aeson-2.1.2.1
         - katip-rollbar < 0 # tried katip-rollbar-0.3.0.1, but its *library* requires async >=2.1 && < 2.2 and the snapshot contains async-2.2.4
         - katip-rollbar < 0 # tried katip-rollbar-0.3.0.1, but its *library* requires katip >=0.5 && < 0.6 and the snapshot contains katip-0.8.7.4
@@ -7488,6 +7489,7 @@ packages:
         - monad-control-aligned < 0 # tried monad-control-aligned-0.0.1.1, but its *library* requires transformers-compat >=0.3 && < 0.7 and the snapshot contains transformers-compat-0.7.2
         - monad-journal < 0 # tried monad-journal-0.8.1, but its *library* requires mtl >=2.1 && < 2.3 and the snapshot contains mtl-2.3.1
         - monad-journal < 0 # tried monad-journal-0.8.1, but its *library* requires transformers >=0.3 && < 0.6 and the snapshot contains transformers-0.6.1.0
+        - monad-logger-logstash < 0 # tried monad-logger-logstash-0.2.0.2, but its *library* requires the disabled package: logstash
         - monad-logger-prefix < 0 # tried monad-logger-prefix-0.1.12, but its *library* requires mtl >=2.1 && < 2.3 and the snapshot contains mtl-2.3.1
         - monad-logger-prefix < 0 # tried monad-logger-prefix-0.1.12, but its *library* requires text >=1.1 && < 1.3 and the snapshot contains text-2.0.2
         - monad-logger-prefix < 0 # tried monad-logger-prefix-0.1.12, but its *library* requires transformers >=0.4.0 && < 0.5.7 and the snapshot contains transformers-0.6.1.0