diff --git a/pkgs/development/libraries/sundials/3.x.nix b/pkgs/development/libraries/sundials/3.x.nix
deleted file mode 100644
index 879f13e8bf5..00000000000
--- a/pkgs/development/libraries/sundials/3.x.nix
+++ /dev/null
@@ -1,52 +0,0 @@
-{ stdenv
-, cmake
-, fetchurl
-, python
-, liblapack
-, gfortran
-, lapackSupport ? true }:
-
-let liblapackShared = liblapack.override {
-  shared = true;
-};
-
-in stdenv.mkDerivation rec {
-  pname = "sundials";
-  version = "3.2.1";
-
-  buildInputs = [ python ] ++ stdenv.lib.optionals (lapackSupport) [ gfortran ];
-  nativeBuildInputs = [ cmake ];
-
-  src = fetchurl {
-    url = "https://computation.llnl.gov/projects/${pname}/download/${pname}-${version}.tar.gz";
-    sha256 = "0238r1qnwqz13wcjzfsbcfi8rfnlxcjjmxq2vpf2qf5jgablvna7";
-  };
-
-  patches = [
-    (fetchurl {
-      # https://github.com/LLNL/sundials/pull/19
-      url = "https://github.com/LLNL/sundials/commit/1350421eab6c5ab479de5eccf6af2dcad1eddf30.patch";
-      sha256 = "0g67lixp9m85fqpb9rzz1hl1z8ibdg0ldwq5z6flj5zl8a7cw52l";
-    })
-  ];
-
-  cmakeFlags = [
-    "-DEXAMPLES_INSTALL_PATH=${placeholder "out"}/share/examples"
-  ] ++ stdenv.lib.optionals (lapackSupport) [
-    "-DSUNDIALS_INDEX_TYPE=int32_t"
-    "-DLAPACK_ENABLE=ON"
-    "-DLAPACK_LIBRARIES=${liblapackShared}/lib/liblapack${stdenv.hostPlatform.extensions.sharedLibrary};${liblapackShared}/lib/libblas${stdenv.hostPlatform.extensions.sharedLibrary}"
-  ];
-
-  # flaky tests, and patch in https://github.com/LLNL/sundials/pull/21 doesn't apply cleanly for sundials_3
-  doCheck = false;
-  checkPhase = "make test";
-
-  meta = with stdenv.lib; {
-    description = "Suite of nonlinear differential/algebraic equation solvers";
-    homepage    = https://computation.llnl.gov/projects/sundials;
-    platforms   = platforms.all;
-    maintainers = with maintainers; [ flokli idontgetoutmuch ];
-    license     = licenses.bsd3;
-  };
-}
diff --git a/pkgs/development/python-modules/scikits-odes/default.nix b/pkgs/development/python-modules/scikits-odes/default.nix
index 89ffe334e7f..ba3d5eaaff0 100644
--- a/pkgs/development/python-modules/scikits-odes/default.nix
+++ b/pkgs/development/python-modules/scikits-odes/default.nix
@@ -1,7 +1,7 @@
 { stdenv
 , lib
 , buildPythonPackage
-, fetchFromGitHub
+, fetchPypi
 , fetchurl
 , cython
 , enum34
@@ -11,19 +11,16 @@
 , pytest
 , python
 , scipy
-, sundials_3
+, sundials
 }:
 
 buildPythonPackage rec {
   pname = "scikits.odes";
-  version = "2.4.0-9-g93075ae";
+  version = "2.6.1";
 
-  # we fetch github instead of Pypi, as we want #104 and #105, which don't apply cleanly on 2.4.0
-  src = fetchFromGitHub {
-    owner = "bmcage";
-    repo = "odes";
-    rev = "93075ae25c409f572f13ca7207fada5706f73c73";
-    sha256 = "161rab7hy6r1a9xw1zby9xhnnmxi0zwdpzxfpjkw9651xn2k5xyw";
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0kbf2n16h9s35x6pavlx6sff0pqr68i0x0609z92a4vadni32n6b";
   };
 
   nativeBuildInputs = [
@@ -33,7 +30,7 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [
     numpy
-    sundials_3
+    sundials
     scipy
   ] ++ lib.optionals (!isPy3k) [ enum34 ];
 
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index dabbfcd6d49..42478f38b84 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -423,6 +423,7 @@ mapAliases ({
   smbclient = samba; # added 2018-04-25
   slim = throw "slim has been removed. Please use a different display-manager"; # added 2019-11-11
   slimThemes = throw "slimThemes has been removed because slim has been also"; # added 2019-11-11
+  sundials_3 = throw "removed 2020-02. outdated and no longer needed";
   net_snmp = net-snmp; # added 2019-12-21
   spaceOrbit = space-orbit; # addewd 2016-05-23
   speech_tools = speech-tools; # added 2018-04-25
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 4c8282ef729..025c6a4631c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -14400,8 +14400,6 @@ in
 
   sundials = callPackage ../development/libraries/sundials { };
 
-  sundials_3 = callPackage ../development/libraries/sundials/3.x.nix { };
-
   sutils = callPackage ../tools/misc/sutils { };
 
   svrcore = callPackage ../development/libraries/svrcore { };