diff --git a/pkgs/os-specific/linux/jool/default.nix b/pkgs/os-specific/linux/jool/default.nix
index 84a621e7f1204..d65be175fc1dc 100644
--- a/pkgs/os-specific/linux/jool/default.nix
+++ b/pkgs/os-specific/linux/jool/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub, kernel }:
 
-assert stdenv.lib.versionOlder kernel.version "4.17";
+assert stdenv.lib.versionOlder kernel.version "4.18";
 
 let
   sourceAttrs = (import ./source.nix) { inherit fetchFromGitHub; };
diff --git a/pkgs/os-specific/linux/jool/source.nix b/pkgs/os-specific/linux/jool/source.nix
index f15b91f9f142d..24134b8b81829 100644
--- a/pkgs/os-specific/linux/jool/source.nix
+++ b/pkgs/os-specific/linux/jool/source.nix
@@ -1,11 +1,11 @@
 { fetchFromGitHub }:
 
 rec {
-  version = "3.5.7";
+  version = "unstable-20180706";
   src = fetchFromGitHub {
     owner = "NICMx";
     repo = "Jool";
-    rev = "v${version}";
-    sha256 = "1qxhrchhm4lbyxkp6wm47a85aa4d9wlyy3kdijl8rarngvh8j1yx";
+    rev = "de791931d94e972c36bb3c102a9cadab5230c285";
+    sha256 = "09mr7lc9k17znpslsfmndx4vgl240llcgblxm92fizmwz23y1d6c";
   };
 }