diff --git a/examples/31-optparse.hell b/examples/32-optparse.hell
similarity index 100%
rename from examples/31-optparse.hell
rename to examples/32-optparse.hell
diff --git a/examples/33-null-stream.hell b/examples/33-null-stream.hell
new file mode 100644
index 0000000..340701e
--- /dev/null
+++ b/examples/33-null-stream.hell
@@ -0,0 +1,3 @@
+main = do
+  -- discard stdout
+  Process.runProcess_ $ Process.setStdout Process.nullStream $ Process.proc "ls" []
diff --git a/hell.cabal b/hell.cabal
index 0dbfd34..f447e21 100644
--- a/hell.cabal
+++ b/hell.cabal
@@ -22,7 +22,7 @@ executable hell
       QuickCheck
     , aeson
     , async
-    , base >=4.17.2.1 && <4.18
+    , base >=4.17.2.1 && <4.19
     , bytestring
     , constraints
     , containers
diff --git a/src/Hell.hs b/src/Hell.hs
index b44dde6..22092b2 100644
--- a/src/Hell.hs
+++ b/src/Hell.hs
@@ -1653,7 +1653,10 @@ polyLits =
                  -- Process
                  "Process.runProcess" runProcess :: forall a b c. ProcessConfig a b c -> IO ExitCode
                  "Process.runProcess_" runProcess_ :: forall a b c. ProcessConfig a b c -> IO ()
+                 "Process.setStdin" setStdin :: forall stdin stdin' stdout stderr. StreamSpec 'STInput stdin' -> ProcessConfig stdin stdout stderr -> ProcessConfig stdin' stdout stderr
                  "Process.setStdout" setStdout :: forall stdin stdout stdout' stderr. StreamSpec 'STOutput stdout' -> ProcessConfig stdin stdout stderr -> ProcessConfig stdin stdout' stderr
+                 "Process.setStderr" setStderr :: forall stdin stdout stderr stderr'. StreamSpec 'STOutput stderr' -> ProcessConfig stdin stdout stderr -> ProcessConfig stdin stdout stderr'
+                 "Process.nullStream" Process.nullStream :: forall (a :: StreamType). StreamSpec a ()
                  "Process.useHandleClose" useHandleClose :: forall (a :: StreamType). IO.Handle -> StreamSpec a ()
                  "Process.useHandleOpen" useHandleOpen :: forall (a :: StreamType). IO.Handle -> StreamSpec a ()
                  "Process.setWorkingDir" process_setWorkingDir :: forall a b c. Text -> ProcessConfig a b c -> ProcessConfig a b c