diff --git a/stackage.cabal b/stackage.cabal
--- a/stackage.cabal
+++ b/stackage.cabal
@@ -1,5 +1,5 @@
 name:                stackage
-version:             0.2.1.2
+version:             0.2.1.3
 synopsis:            "Stable Hackage," tools for creating a vetted set of packages from Hackage.
 description:         Please see <http://www.stackage.org/package/stackage> for a description and documentation.
 homepage:            https://github.com/fpco/stackage
@@ -87,6 +87,8 @@
                      , Cabal
                      , yaml
                      , containers
+                     , http-client
+                     , http-client-tls
 
 source-repository head
   type:     git
diff --git a/test/Stackage/BuildPlanSpec.hs b/test/Stackage/BuildPlanSpec.hs
--- a/test/Stackage/BuildPlanSpec.hs
+++ b/test/Stackage/BuildPlanSpec.hs
@@ -9,10 +9,12 @@
 import qualified Data.Yaml as Y
 import Distribution.Version (anyVersion)
 import qualified Data.Map as Map
+import Network.HTTP.Client (withManager)
+import Network.HTTP.Client.TLS (tlsManagerSettings)
 
 spec :: Spec
-spec = it "works" $ do
-    bc <- defaultBuildConstraints (error "manager should not be used")
+spec = it "works" $ withManager tlsManagerSettings $ \man -> do
+    bc <- defaultBuildConstraints man
     bp <- newBuildPlan bc
     let bs = Y.encode bp
         ebp' = Y.decodeEither bs