diff --git a/monad-bayes.cabal b/monad-bayes.cabal
index a98712fe..8a787172 100644
--- a/monad-bayes.cabal
+++ b/monad-bayes.cabal
@@ -57,7 +57,7 @@ common deps
     , mwc-random       >=0.13.6   && <0.16
     , pipes            ^>=4.3
     , pretty-simple    ^>=4.1
-    , primitive        >=0.7      && <0.9
+    , primitive        >=0.8      && <0.10
     , random           ^>=1.2
     , safe             ^>=0.3.17
     , scientific       ^>=0.3
@@ -65,7 +65,7 @@ common deps
     , text             >=1.2      && <2.2
     , transformers     >=0.5.6    && <0.7
     , vector           >=0.12.0   && <0.14
-    , vty              ^>=6.1
+    , vty              >=6.1      && <6.3
     , vty-unix         ^>=0.2.0.0
 
 common test-deps