diff --git a/ChangeLog.md b/ChangeLog.md
index 3dd9afc9..416ca03d 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,7 +1,8 @@
-## 0.4.1
+## 0.5.0
 
 * Print "Still Alive" while checking, to avoid Travis timeouts
 * Include `stackage upload-nightly` command
+* Optional plan checking
 
 ## 0.4.0
 
diff --git a/Stackage/CompleteBuild.hs b/Stackage/CompleteBuild.hs
index acdf682b..7a96ce74 100644
--- a/Stackage/CompleteBuild.hs
+++ b/Stackage/CompleteBuild.hs
@@ -35,6 +35,7 @@ data BuildFlags = BuildFlags
     , bfDoUpload         :: !Bool
     , bfEnableLibProfile :: !Bool
     , bfVerbose          :: !Bool
+    , bfSkipCheck        :: !Bool
     } deriving (Show)
 
 data BuildType = Nightly | LTS BumpType
@@ -200,6 +201,7 @@ getPerformBuild buildFlags Settings {..} = PerformBuild
     , pbEnableTests = bfEnableTests buildFlags
     , pbEnableLibProfiling = bfEnableLibProfile buildFlags
     , pbVerbose = bfVerbose buildFlags
+    , pbAllowNewer = bfSkipCheck buildFlags
     }
 
 -- | Make a complete plan, build, test and upload bundle, docs and
@@ -214,8 +216,11 @@ completeBuild buildType buildFlags = withManager tlsManagerSettings $ \man -> do
     putStrLn $ "Writing build plan to: " ++ fpToText planFile
     encodeFile (fpToString planFile) plan
 
-    putStrLn "Checking build plan"
-    checkBuildPlan plan
+    if bfSkipCheck buildFlags
+        then putStrLn "Skipping build plan check"
+        else do
+            putStrLn "Checking build plan"
+            checkBuildPlan plan
 
     putStrLn "Performing build"
     performBuild (getPerformBuild buildFlags settings) >>= mapM_ putStrLn
diff --git a/Stackage/PerformBuild.hs b/Stackage/PerformBuild.hs
index 7cdb3efd..55601341 100644
--- a/Stackage/PerformBuild.hs
+++ b/Stackage/PerformBuild.hs
@@ -64,6 +64,8 @@ data PerformBuild = PerformBuild
     , pbEnableTests        :: Bool
     , pbEnableLibProfiling :: Bool
     , pbVerbose            :: Bool
+    , pbAllowNewer         :: Bool
+    -- ^ Pass --allow-newer to cabal configure
     }
 
 data PackageInfo = PackageInfo
@@ -293,6 +295,7 @@ singleBuild pb@PerformBuild {..} SingleBuild {..} =
         withBinaryFile (fpToString fp) WriteMode inner'
 
     configArgs = ($ []) $ execWriter $ do
+        when pbAllowNewer $ tell' "--allow-newer"
         tell' "--package-db=clear"
         tell' "--package-db=global"
         forM_ (pbDatabase pb) $ \db -> tell' $ "--package-db=" ++ fpToText db
diff --git a/app/stackage.hs b/app/stackage.hs
index f9d31f7c..1f61496f 100644
--- a/app/stackage.hs
+++ b/app/stackage.hs
@@ -78,7 +78,10 @@ main =
              help "Enable profiling when building") <*>
         switch
             (long "verbose" <> short 'v' <>
-             help "Output verbose detail about the build steps")
+             help "Output verbose detail about the build steps") <*>
+        switch
+            (long "skip-check" <>
+             help "Skip the check phase, and pass --allow-newer to cabal configure")
 
     nightlyUploadFlags = fromString <$> strArgument
         (metavar "DATE" <>
diff --git a/stackage.cabal b/stackage.cabal
index 8401a6ad..03a55f6e 100644
--- a/stackage.cabal
+++ b/stackage.cabal
@@ -1,5 +1,5 @@
 name:                stackage
-version:             0.4.1
+version:             0.5.0
 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