diff --git a/pkgs/development/libraries/libxml2/default.nix b/pkgs/development/libraries/libxml2/default.nix
index 7ed50f61224..f5dcb3357f7 100644
--- a/pkgs/development/libraries/libxml2/default.nix
+++ b/pkgs/development/libraries/libxml2/default.nix
@@ -8,11 +8,11 @@
 
 stdenv.mkDerivation rec {
   pname = "libxml2";
-  version = "2.9.9";
+  version = "2.9.10";
 
   src = fetchurl {
     url = "http://xmlsoft.org/sources/${pname}-${version}.tar.gz";
-    sha256 = "0wd881jzvqayx0ihzba29jl80k06xj9ywp16kxacdqs3064p1ywl";
+    sha256 = "07xynh8hcxb2yb1fs051xrgszjvj37wnxvxgsj10rzmqzy9y3zma";
   };
   patches = [
     # Upstream bugs:
@@ -53,6 +53,12 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
+  # disable test that's problematic with newer pythons: see
+  # https://mail.gnome.org/archives/xml/2017-August/msg00014.html
+  preCheck = lib.optionalString (pythonSupport && !(python?pythonOlder && python.pythonOlder "3.5")) ''
+    echo "" > python/tests/tstLastError.py
+  '';
+
   doCheck = (stdenv.hostPlatform == stdenv.buildPlatform) && !stdenv.isDarwin &&
     stdenv.hostPlatform.libc != "musl";
 
diff --git a/pkgs/development/libraries/libxslt/default.nix b/pkgs/development/libraries/libxslt/default.nix
index ed77a1873a8..6d12329a7f5 100644
--- a/pkgs/development/libraries/libxslt/default.nix
+++ b/pkgs/development/libraries/libxslt/default.nix
@@ -10,31 +10,13 @@ with stdenv.lib;
 
 stdenv.mkDerivation rec {
   pname = "libxslt";
-  version = "1.1.33";
+  version = "1.1.34";
 
   src = fetchurl {
     url = "http://xmlsoft.org/sources/${pname}-${version}.tar.gz";
-    sha256 = "1j1q1swnsy8jgi9x7mclvkrqhfgn09886gdlr9wzk7a08i8n0dlf";
+    sha256 = "0zrzz6kjdyavspzik6fbkpvfpbd25r2qg6py5nnjaabrsr3bvccq";
   };
 
-  patches = [
-    (fetchpatch {
-      name = "CVE-2019-11068.patch";
-      url = "https://gitlab.gnome.org/GNOME/libxslt/commit/e03553605b45c88f0b4b2980adfbbb8f6fca2fd6.patch";
-      sha256 = "0pkpb4837km15zgg6h57bncp66d5lwrlvkr73h0lanywq7zrwhj8";
-    })
-    (fetchpatch {
-      url = "https://gitlab.gnome.org/GNOME/libxslt/commit/c5eb6cf3aba0af048596106ed839b4ae17ecbcb1.patch";
-      name = "CVE-2019-13117.patch";
-      sha256 = "0ynfq8y5h623cypj1426iiz7796n3mqbjqa24ndvh2am6rl5lw15";
-    })
-    (fetchpatch {
-      url = "https://gitlab.gnome.org/GNOME/libxslt/commit/6ce8de69330783977dd14f6569419489875fb71b.patch";
-      name = "CVE-2019-13118.patch";
-      sha256 = "0bglz9m9sh2vi50qxcm06iqrazw3h45ycgxnp15iankq95z283iq";
-    })
-  ];
-
   outputs = [ "bin" "dev" "out" "man" "doc" ] ++ stdenv.lib.optional pythonSupport "py";
 
   buildInputs = [ libxml2.dev ]