diff --git a/wai-app-file-cgi.cabal b/wai-app-file-cgi.cabal
--- a/wai-app-file-cgi.cabal
+++ b/wai-app-file-cgi.cabal
@@ -1,5 +1,5 @@
 Name:                   wai-app-file-cgi
-Version:                3.1.8
+Version:                3.1.9
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
@@ -64,7 +64,7 @@
                       , unix
                       , wai >= 3.2 && < 3.3
                       , wai-conduit
-                      , warp >= 3.2.21 && < 3.3
+                      , warp >= 3.3 && < 3.4
                       , word8
   if impl(ghc >= 8)
     Default-Extensions:  Strict StrictData
@@ -98,7 +98,7 @@
                       , unix
                       , wai >= 3.2 && < 3.3
                       , wai-app-file-cgi
-                      , warp >= 3.2.6 && < 3.3
+                      , warp >= 3.3 && < 3.4
                       , HTTP
   if impl(ghc >= 8)
     Default-Extensions:  Strict StrictData