diff --git a/pkgs/tools/networking/p2p/tahoe-lafs/default.nix b/pkgs/tools/networking/p2p/tahoe-lafs/default.nix
index 0c04d76e23f..277e95eac96 100644
--- a/pkgs/tools/networking/p2p/tahoe-lafs/default.nix
+++ b/pkgs/tools/networking/p2p/tahoe-lafs/default.nix
@@ -8,15 +8,15 @@
 # some loss of functionality because of it.
 
 let
-  name = "tahoe-lafs-1.8.3";
+  name = "tahoe-lafs-1.9.2";
 in
 buildPythonPackage {
   inherit name;
   namePrefix = "";
 
   src = fetchurl {
-    url = "http://tahoe-lafs.org/source/tahoe-lafs/snapshots/allmydata-tahoe-1.8.3.tar.bz2";
-    sha256 = "00pm7fvwci5ncg2jhsqsl9r79kn495yni8nmr7p5i98f3siwvjd8";
+    url = "http://tahoe-lafs.org/source/tahoe-lafs/snapshots/allmydata-tahoe-1.9.2.tar.bz2";
+    sha256 = "0111gmavyrnglx10kj8z7wm7y97fyg9isv71c0gx9kq4c03knxq4";
   };
 
   # The patch doesn't apply cleanly to the current version.
@@ -37,7 +37,7 @@ buildPythonPackage {
         -es"|cmd = find_exe.find_exe('twistd')|cmd = ['${twisted}/bin/twistd']|g"
 
     sed -i "src/allmydata/util/iputil.py" \
-        -es"|_linux_path = '/sbin/ifconfig'|_linux_path = '${nettools}/sbin/ifconfig'|g"
+        -es"|_linux_path = '/sbin/ifconfig'|_linux_path = '${nettools}/bin/ifconfig'|g"
 
     # Chroots don't have /etc/hosts and /etc/resolv.conf, so work around
     # that.
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 02c34964c5a..91118684474 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1645,11 +1645,11 @@ pythonPackages = python.modules // rec {
 
 
   foolscap = buildPythonPackage (rec {
-    name = "foolscap-0.6.1";
+    name = "foolscap-0.6.4";
 
     src = fetchurl {
       url = "http://foolscap.lothar.com/releases/${name}.tar.gz";
-      sha256 = "8b3e4fc678c5c41483b3130666583a1c3909713adcd325204daded7b67171ed5";
+      sha256 = "16cddyk5is0gjfn0ia5n2l4lhdzvbjzlx6sfpy7ddjd3d3fq7ckl";
     };
 
     propagatedBuildInputs = [ twisted pkgs.pyopenssl ];