diff --git a/.travis.yml b/.travis.yml
index 7055c67..46d7a50 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -45,14 +45,6 @@ matrix:
     compiler: ": #stack default"
     addons: {apt: {packages: [ghc-8.2.2,libblas-dev,liblapack-dev], sources: [hvr-ghc]}}
 
-  - env: BUILD=stack ARGS="--resolver lts-8"
-    compiler: ": #stack 8.0.2"
-    addons: {apt: {packages: [ghc-8.0.2,libblas-dev,liblapack-dev], sources: [hvr-ghc]}}
-
-  - env: BUILD=stack ARGS="--resolver lts-9"
-    compiler: ": #stack 8.0.2"
-    addons: {apt: {packages: [ghc-8.0.2,libblas-dev,liblapack-dev], sources: [hvr-ghc]}}
-
   - env: BUILD=stack ARGS="--resolver lts-10"
     compiler: ": #stack 8.2.2"
     addons: {apt: {packages: [ghc-8.2.2,libblas-dev,liblapack-dev], sources: [hvr-ghc]}}
@@ -67,14 +59,6 @@ matrix:
     compiler: ": #stack default osx"
     os: osx
 
-  - env: BUILD=stack ARGS="--resolver lts-8"
-    compiler: ": #stack 8.0.2 osx"
-    os: osx
-
-  - env: BUILD=stack ARGS="--resolver lts-9"
-    compiler: ": #stack 8.0.2 osx"
-    os: osx
-
   - env: BUILD=stack ARGS="--resolver lts-10"
     compiler: ": #stack 8.2.2 osx"
     os: osx
@@ -126,7 +110,7 @@ install:
   set -ex
   case "$BUILD" in
     stack)
-      stack --no-terminal --install-ghc $ARGS test --bench --only-dependencies
+    stack --no-terminal --install-ghc $ARGS test --bench --only-dependencies
       ;;
     cabal)
       cabal --version
@@ -141,10 +125,10 @@ script:
   set -ex
   case "$BUILD" in
     stack)
-      stack --no-terminal $ARGS test --bench --no-run-benchmarks --haddock --no-haddock-deps
+      stack --no-terminal $ARGS test --bench --no-run-benchmarks --haddock --no-haddock-deps --ghc-options=-Werror
       ;;
     cabal)
-      cabal install --enable-tests --enable-benchmarks --force-reinstalls --ghc-options=-O0 --reorder-goals --max-backjumps=-1 $CABALARGS $PACKAGES
+      cabal install --enable-tests --enable-benchmarks --force-reinstalls --ghc-options="-O0 -Werror" --reorder-goals --max-backjumps=-1 $CABALARGS $PACKAGES
 
       ORIGDIR=$(pwd)
       for dir in $PACKAGES
diff --git a/package.yaml b/package.yaml
index ba8e66d..867842e 100644
--- a/package.yaml
+++ b/package.yaml
@@ -21,29 +21,32 @@ description:         Please see the README on Github at <https://github.com/mstk
 
 ghc-options:
 - -Wall
+- -Wcompat
+- -Wredundant-constraints
+- -Wincomplete-record-updates
 
 dependencies:
-- base >= 4.7 && < 5
-- hmatrix >= 0.18.1
 - backprop >= 0.1.2
-- ghc-typelits-natnormalise
-- ghc-typelits-knownnat
+- base >= 4.7 && < 5
+- hmatrix >= 0.18
 - microlens
-- vector
-- vector-sized
+- vector-sized >= 0.6
 
 library:
   source-dirs: src
   exposed-modules:
   - Numeric.LinearAlgebra.Static.Backprop
-  ghc-options:
-  - -fwarn-redundant-constraints
   dependencies:
   - ANum >= 0.2
+  - ghc-typelits-knownnat
+  - ghc-typelits-natnormalise
+  - vector
 
 tests:
   hmatrix-backprop-test:
     main:                Spec.hs
+    other-modules:
+    - Nudge
     source-dirs:         test
     ghc-options:
     - -threaded
diff --git a/src/Numeric/LinearAlgebra/Static/Backprop.hs b/src/Numeric/LinearAlgebra/Static/Backprop.hs
index 1008ad6..2d4cc8e 100644
--- a/src/Numeric/LinearAlgebra/Static/Backprop.hs
+++ b/src/Numeric/LinearAlgebra/Static/Backprop.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP                                      #-}
 {-# LANGUAGE DataKinds                                #-}
 {-# LANGUAGE FlexibleContexts                         #-}
 {-# LANGUAGE GADTs                                    #-}
@@ -9,6 +10,10 @@
 {-# LANGUAGE ViewPatterns                             #-}
 {-# OPTIONS_GHC -fplugin GHC.TypeLits.KnownNat.Solver #-}
 {-# OPTIONS_GHC -fplugin GHC.TypeLits.Normalise       #-}
+#if MIN_VERSION_base(4,11,0)
+#else
+{-# OPTIONS_GHC -Wno-compat                           #-}
+#endif
 
 -- |
 -- Module      : Numeric.LinearAlgebra.Static.Backprop
@@ -80,9 +85,6 @@
 -- Some other notes:
 --
 --     * Added 'sumElements', as well, for convenience.
---     * Lifted 'H.svd' is temporarily currently not exported, due to a bug
---     in /hmatrix/ in the 'H.diagR' function.  When this bug is patched,
---     'H.svd' will exported.
 
 module Numeric.LinearAlgebra.Static.Backprop (
   -- * Vector
@@ -124,9 +126,8 @@ module Numeric.LinearAlgebra.Static.Backprop (
   , (#>)
   , (<.>)
   -- * Factorizations
-  -- $svd
-  -- , svd
-  -- , svd_
+  , svd
+  , svd_
   , H.Eigen
   , eigensystem
   , eigenvalues
@@ -200,6 +201,10 @@ import qualified Numeric.LinearAlgebra        as HU
 import qualified Numeric.LinearAlgebra.Devel  as HU
 import qualified Numeric.LinearAlgebra.Static as H
 
+#if MIN_VERSION_base(4,11,0)
+import           Prelude hiding               ((<>))
+#endif
+
 vec2
     :: Reifies s W
     => BVar s H.ℝ
@@ -436,35 +441,29 @@ infixr 8 #>
 infixr 8 <.>
 {-# INLINE (<.>) #-}
 
--- $svd
---
--- Note: Lifted versions of 'H.svd' temporarily unexported due to a bug in
--- /hmatrix/, in 'H.diagR'.
-
 -- | Can only get the singular values, for now.  Let me know if you find an
 -- algorithm that can compute the gradients based on differentials for the
 -- other matricies!
 --
--- TODO: bug in diagR
-_svd :: forall m n s. (Reifies s W, KnownNat m, KnownNat n)
+svd :: forall m n s. (Reifies s W, KnownNat m, KnownNat n)
     => BVar s (H.L m n)
     -> BVar s (H.R n)
-_svd = liftOp1 . op1 $ \x ->
+svd = liftOp1 . op1 $ \x ->
     let (u, σ, v) = H.svd x
     in  ( σ
-        , \dΣ -> u H.<> H.diagR 0 dΣ H.<> H.tr v
+        , \(dΣ :: H.R n) -> (u H.<> H.diagR 0 dΣ) H.<> H.tr v
+                -- must manually associate because of bug in diagR in
+                -- hmatrix-0.18.2.0
         )
-{-# INLINE _svd #-}
+{-# INLINE svd #-}
 
 -- | Version of 'svd' that returns the full SVD, but if you attempt to find
 -- the gradient, it will fail at runtime if you ever use U or V.
---
--- Useful if you want to only use 'evalBP'.
-_svd_
+svd_
     :: forall m n s. (Reifies s W, KnownNat m, KnownNat n)
     => BVar s (H.L m n)
     -> (BVar s (H.L m m), BVar s (H.R n), BVar s (H.L n n))
-_svd_ r = (t ^^. _1, t ^^. _2, t ^^. _3)
+svd_ r = (t ^^. _1, t ^^. _2, t ^^. _3)
   where
     o :: Op '[H.L m n] (T3 (H.L m m) (H.R n) (H.L n n))
     o = op1 $ \x ->
@@ -472,13 +471,13 @@ _svd_ r = (t ^^. _1, t ^^. _2, t ^^. _3)
         in  ( T3 u σ v
             , \(T3 dU dΣ dV) ->
                     if H.norm_0 dU == 0 && H.norm_0 dV == 0
-                      then u H.<> H.diagR 0 dΣ H.<> H.tr v
+                      then (u H.<> H.diagR 0 dΣ) H.<> H.tr v
                       else error "svd_: Cannot backprop if U and V are used."
             )
     {-# INLINE o #-}
     t = liftOp1 o r
     {-# NOINLINE t #-}
-{-# INLINE _svd_ #-}
+{-# INLINE svd_ #-}
 
 helpEigen :: KnownNat n => H.Sym n -> (H.R n, H.L n n, H.L n n, H.L n n)
 helpEigen x = (l, v, H.inv v, H.tr v)
@@ -792,9 +791,6 @@ cross = liftOp2 . op2 $ \x y ->
 {-# INLINE cross #-}
 
 -- | Create matrix with diagonal, and fill with default entries
---
--- Note that this inherits the bug in 'H.diagR' if used with a version of
--- /hmatrix/ wiith the bug (currently, 0.18.2.0).
 diagR
     :: forall m n k field vec mat s.
        ( Reifies s W
@@ -836,6 +832,9 @@ dvmap f = liftOp1 . op1 $ \x ->
         )
 {-# INLINE dvmap #-}
 
+-- TODO: Can be made more efficient if backprop exports
+-- a custom-total-derivative version
+
 -- | A version of 'dvmap' that is less performant but is based on
 -- 'H.zipWithVector' from 'H.Domain'.
 dvmap'
diff --git a/test/Nudge.hs b/test/Nudge.hs
index 55f06cf..fc6c4c9 100644
--- a/test/Nudge.hs
+++ b/test/Nudge.hs
@@ -1,12 +1,13 @@
-{-# LANGUAGE DataKinds             #-}
-{-# LANGUAGE FlexibleContexts      #-}
-{-# LANGUAGE FlexibleInstances     #-}
-{-# LANGUAGE MultiParamTypeClasses #-}
-{-# LANGUAGE RankNTypes            #-}
-{-# LANGUAGE ScopedTypeVariables   #-}
-{-# LANGUAGE TupleSections         #-}
-{-# LANGUAGE TypeApplications      #-}
-{-# LANGUAGE TypeFamilies          #-}
+{-# LANGUAGE DataKinds                          #-}
+{-# LANGUAGE FlexibleContexts                   #-}
+{-# LANGUAGE FlexibleInstances                  #-}
+{-# LANGUAGE MultiParamTypeClasses              #-}
+{-# LANGUAGE RankNTypes                         #-}
+{-# LANGUAGE ScopedTypeVariables                #-}
+{-# LANGUAGE TupleSections                      #-}
+{-# LANGUAGE TypeApplications                   #-}
+{-# LANGUAGE TypeFamilies                       #-}
+{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
 
 module Nudge where
 
@@ -16,7 +17,7 @@ import           Data.Finite
 import           Data.Kind
 import           Data.Maybe
 import           Data.Proxy
-import           GHC.TypeNats
+import           GHC.TypeLits
 import           Hedgehog
 import           Lens.Micro
 import           Lens.Micro.Platform                   ()
@@ -70,7 +71,7 @@ instance KnownNat n => Testing (H.R n) where
     scalarize = B.norm_2V
     genTest = H.vector <$> replicateM n genTest
       where
-        n = fromIntegral $ natVal (Proxy @n)
+        n = fromInteger $ natVal (Proxy @n)
 
 instance (KnownNat n, KnownNat m) => Testing (H.L n m) where
     type TIx (H.L n m) = (Int, Int)
@@ -79,7 +80,7 @@ instance (KnownNat n, KnownNat m) => Testing (H.L n m) where
     scalarize = sqrt . B.sumElements . (**2)
     genTest = H.matrix <$> replicateM nm genTest
       where
-        nm = fromIntegral $ natVal (Proxy @n) * natVal (Proxy @m)
+        nm = fromInteger $ natVal (Proxy @n) * natVal (Proxy @m)
 
 instance Testing (HU.Vector Double) where
     type TIx (HU.Vector Double) = Int
diff --git a/test/Spec.hs b/test/Spec.hs
index 7d1ddb0..2e4f282 100644
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -88,13 +88,11 @@ prop_tr = nudgeProp @(L 3 2) B.tr
 prop_diag :: Property
 prop_diag = nudgeProp @(R 3) B.diag
 
--- TODO: bug in diagR
--- prop_svd :: Property
--- prop_svd = nudgeProp (genMat @5 @4) B.svd
+prop_svd :: Property
+prop_svd = nudgeProp @(L 3 2) B.svd
 
--- TODO: bug in diagR
--- prop_svd_ :: Property
--- prop_svd_ = nudgeProp (genMat @5 @4) ((\(_,x,_) -> x) . B.svd_)
+prop_svd_ :: Property
+prop_svd_ = nudgeProp @(L 3 2) ((\(_,x,_) -> x) . B.svd_)
 
 prop_eigensystem1 :: Property
 prop_eigensystem1 = nudgeProp @(L 3 2) (fst . B.eigensystem . B.mTm)