diff --git a/slackbuilder.cabal b/slackbuilder.cabal
index ca68bce..f6cd1cb 100644
--- a/slackbuilder.cabal
+++ b/slackbuilder.cabal
@@ -29,8 +29,10 @@ common dependencies
     conduit ^>= 1.3.5,
     conduit-extra ^>= 1.3,
     http-client ^>= 0.7,
+    -- Workaround: 0.3.6.4 is broken, explicit dependency is otherwise not needed.
+    http-client-tls == 0.3.6.3,
     containers ^>= 0.6,
-    cryptonite >= 0.30,
+    crypton ^>= 1.0,
     directory ^>= 1.3.8,
     exceptions >= 0.10,
     filepath ^>= 1.4.2,