diff --git a/pkgs/applications/networking/irc/weechat/scripts/weechat-otr/default.nix b/pkgs/applications/networking/irc/weechat/scripts/weechat-otr/default.nix
index 9682aa3169ac..dc4e7f245e72 100644
--- a/pkgs/applications/networking/irc/weechat/scripts/weechat-otr/default.nix
+++ b/pkgs/applications/networking/irc/weechat/scripts/weechat-otr/default.nix
@@ -8,14 +8,20 @@ let
 
   pycrypto = python3Packages.buildPythonPackage rec {
     pname = "pycrypto";
-    version = "2.6.1-10";
+    version = "2.6.1-13.1";
 
     src = fetchgit {
       url = "https://salsa.debian.org/sramacher/python-crypto.git";
       rev = "debian/${version}";
-      sha256 = "10rgq8bmjfpiqqa1g1p1hh7pxlxs7x0nawvk6zip0pd6x2vsr661";
+      sha256 = "1mahqmlgilgk0rn5hfkhza7kscfm7agdakkb6rqnif9g0qp3s52f";
     };
 
+    postPatch = ''
+      for p in debian/patches/*.patch; do
+        patch -p1 < "$p"
+      done
+    '';
+
     buildInputs = [ gmp ];
 
     preConfigure = ''