diff --git a/Shakefile.hs b/Shakefile.hs
--- a/Shakefile.hs
+++ b/Shakefile.hs
@@ -39,6 +39,16 @@
 fd :: FilePath -> FilePath
 fd = (fakeDir </>)
 
+-- | Meta directory where "virtual" files are kept.
+--
+metaDir :: FilePath
+metaDir = buildDir </> "meta"
+
+-- | Meta directory path builder.
+--
+md :: FilePath -> FilePath
+md = (metaDir </>)
+
 -- | Remove right excess on string.
 --
 rstrip :: String -> String
@@ -102,6 +112,15 @@
   phony target $
     need [ fd target ]
 
+-- | Use a meta file to keep track of vitual content
+--
+meta :: FilePath -> Action String -> Rules ()
+meta target act = do
+  md target %> \out -> do
+    alwaysRerun
+    content <- act
+    writeFileChanged out content
+
 -- | Preprocess a file with m4
 --
 preprocess :: FilePattern -> FilePath -> Action [(String, String)] -> Rules ()
@@ -123,9 +142,15 @@
         , "src//*.hs"
         ]
 
+  -- | version
+  --
+  meta "version"
+    version
+
   -- | preamble.cabal
   --
   preprocess "preamble.cabal" "preamble.cabal.m4" $ do
+    need [ md "version" ]
     v <- version
     return [ ("VERSION", v) ]
 
diff --git a/preamble.cabal b/preamble.cabal
--- a/preamble.cabal
+++ b/preamble.cabal
@@ -1,5 +1,5 @@
 name:                  preamble
-version:               0.0.4
+version:               0.0.5
 synopsis:              Yet another prelude.
 homepage:              https://github.com/swift-nav/preamble
 license:               MIT
@@ -27,7 +27,7 @@
   default-language:    Haskell2010
   ghc-options:         -Wall
   build-depends:       aeson
-                     , base >= 4.8 && < 5
+                     , base >= 4.8 && < 4.9
                      , basic-prelude
                      , exceptions
                      , fast-logger
@@ -47,7 +47,7 @@
 executable shake-preamble
   main-is:             Shakefile.hs
   ghc-options:         -threaded -rtsopts -with-rtsopts=-N -Wall
-  build-depends:       base >= 4.8 && < 5
+  build-depends:       base >= 4.8 && < 4.9
                      , basic-prelude
                      , shake
   default-language:    Haskell2010