diff --git a/build-constraints.yaml b/build-constraints.yaml
index 1dcf824f..7c18936a 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4060,7 +4060,6 @@ packages:
         - cairo < 0 # GHC 8.4 via gtk2hs-buildtools
         - glib < 0 # GHC 8.4 via gtk2hs-buildtools
         - pango < 0 # GHC 8.4 via gtk2hs-buildtools
-        - mcmc-types < 0 # GHC 8.4 via mwc-probability
         - plot < 0 # GHC 8.4 via cairo
         - cryptocipher < 0 # GHC 8.4 via cipher-blowfish
         - cryptocipher < 0 # GHC 8.4 via cipher-camellia
@@ -4120,8 +4119,6 @@ packages:
         - katydid < 0 # GHC 8.4 via json
         - stm-containers < 0 # GHC 8.4 via list-t
         - timemap < 0 # GHC 8.4 via list-t
-        - mighty-metropolis < 0 # GHC 8.4 via mcmc-types
-        - mighty-metropolis < 0 # GHC 8.4 via mwc-probability
         - network-anonymous-tor < 0 # GHC 8.4 via network-attoparsec
         - irc-conduit < 0 # GHC 8.4 via network-conduit-tls
         - distributed-process-tests < 0 # GHC 8.4 via network-transport-inmemory
@@ -4240,7 +4237,6 @@ packages:
         - eventstore < 0 # GHC 8.4 via uuid
         - random-tree < 0 # GHC 8.4 via MonadRandom
         - Chart-cairo < 0 # GHC 8.4 via cairo
-        - speedy-slice < 0 # GHC 8.4 via mcmc-types
         - aern2-mp < 0 # GHC 8.4 via mixed-types-num
         - aern2-real < 0 # GHC 8.4 via mixed-types-num
         - fasta < 0 # GHC 8.4 via pipes-text