diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02e373787..cb8729a5a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## TODO
+
+## 1.4.0.1
+* HEVM updated to [af84e2ee0a0654fdaa91186384233cf1731ee7ce]
+
 ## 1.4.0.0
 
 * Filtering functions either blacklisting or whitelisting functions to call during a fuzzing campaign (#341)
@@ -48,3 +53,4 @@
 * Initial stable release
 
 [2cc059b49cae613025b925f0273b906e25484b68]: https://github.com/dapphub/dapptools/tree/2cc059b49cae613025b925f0273b906e25484b68
+[af84e2ee0a0654fdaa91186384233cf1731ee7ce]: https://github.com/dapphub/dapptools/tree/af84e2ee0a0654fdaa91186384233cf1731ee7ce
diff --git a/lib/Echidna/ABI.hs b/lib/Echidna/ABI.hs
index 229a0b7df..4e9ca3779 100644
--- a/lib/Echidna/ABI.hs
+++ b/lib/Echidna/ABI.hs
@@ -34,7 +34,8 @@ import Data.Vector.Instances ()
 import Data.Word8 (Word8)
 import Numeric (showHex)
 
-import EVM.ABI
+import EVM.ABI hiding (genAbiValue)
+import EVM.Types (Addr)
 
 import qualified Control.Monad.Random.Strict as R
 import qualified Data.ByteString as BS
@@ -116,6 +117,7 @@ defaultDict = mkGenDict 0 [] [] 0 (const Nothing)
 -- We need the above since hlint doesn't notice DeriveAnyClass in StandaloneDeriving.
 deriving instance Hashable AbiType
 deriving instance Hashable AbiValue
+deriving instance Hashable Addr
 
 -- | Construct a 'GenDict' from some dictionaries, a 'Float', a default seed, and a typing rule for
 -- return values
diff --git a/lib/Echidna/Campaign.hs b/lib/Echidna/Campaign.hs
index 7378c1a7b..4c3e38928 100644
--- a/lib/Echidna/Campaign.hs
+++ b/lib/Echidna/Campaign.hs
@@ -31,7 +31,7 @@ import Data.Text (Text)
 import Data.Traversable (traverse)
 import EVM
 import EVM.ABI (getAbi, AbiType(AbiAddressType), AbiValue(AbiAddress))
-import EVM.Types (Addr, addressWord160)
+import EVM.Types (Addr)
 import Numeric (showHex)
 import System.Random (mkStdGen)
 
@@ -291,7 +291,7 @@ callseq v w ql = do
       -- compute the addresses not present in the old VM via set difference
       diff = keys $ new \\ old
       -- and construct a set to union to the constants table
-      diffs = H.fromList [(AbiAddressType, S.fromList $ AbiAddress . addressWord160 <$> diff)]
+      diffs = H.fromList [(AbiAddressType, S.fromList $ AbiAddress <$> diff)]
   -- Save the global campaign state (also vm state, but that gets reset before it's used)
   hasLens .= snd s
   -- Update the gas estimation
diff --git a/package.yaml b/package.yaml
index 9753813a3..11f6d420a 100644
--- a/package.yaml
+++ b/package.yaml
@@ -3,7 +3,7 @@ name: echidna
 author: Trail of Bits <echidna-dev@trailofbits.com>
 maintainer: Trail of Bits <echidna-dev@trailofbits.com>
 
-version: 1.4.0.0
+version: 1.4.0.1
 
 ghc-options: -Wall -fno-warn-orphans -O2 -threaded +RTS -N -RTS
 
@@ -13,11 +13,11 @@ dependencies:
   - ansi-terminal
   - base16-bytestring
   - binary
-  - brick
+  - brick                <= 0.46
   - base16-bytestring
   - bytestring           >= 0.10.8 && < 0.11
   - cborg
-  - containers           >= 0.5.7  && < 0.6
+  - containers
   - data-dword           >= 0.3.1  && < 0.4
   - data-has
   - deepseq
@@ -26,7 +26,7 @@ dependencies:
   - filepath
   - hashable
   - hevm
-  - lens                 >= 4.15.1 && < 4.17
+  - lens
   - lens-aeson
   - megaparsec
   - MonadRandom
diff --git a/src/Main.hs b/src/Main.hs
index 9131361da..5579f99ae 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -14,7 +14,6 @@ import System.IO (hPutStrLn, stderr)
 
 import EVM (env, contracts)
 import EVM.ABI (AbiValue(AbiAddress))
-import EVM.Types (Addr(..))
 
 import Echidna.ABI
 import Echidna.Config
@@ -62,7 +61,7 @@ main = do Options f c conf <- execParser opts
             cs       <- Echidna.Solidity.contracts f
             ads      <- addresses
             (v,w,ts) <- loadSpecified (pack <$> c) cs >>= prepareForTest
-            let ads' = AbiAddress . addressWord160 <$> v ^. env . EVM.contracts . to keys
+            let ads' = AbiAddress <$> v ^. env . EVM.contracts . to keys
             ui v w ts (Just $ mkGenDict (dictFreq $ view cConf cfg) (extractConstants cs ++ NE.toList ads ++ ads') [] g (returnTypes cs)) txs
           saveTxs cd (view corpus cpg)
           if not . isSuccess $ cpg then exitWith $ ExitFailure 1 else exitSuccess
diff --git a/src/test/Spec.hs b/src/test/Spec.hs
index c86a5e732..4d991b7ac 100644
--- a/src/test/Spec.hs
+++ b/src/test/Spec.hs
@@ -4,11 +4,11 @@
 
 import Test.Tasty
 import Test.Tasty.HUnit
-import Test.Tasty.QuickCheck(Arbitrary(..), Gen, (===), property, testProperty)
+import Test.Tasty.QuickCheck(Arbitrary(..), Gen, (===), property, testProperty, resize)
 
 import EVM (env, contracts)
-import EVM.Types (Addr(..))
 import EVM.ABI (AbiValue(..))
+import EVM.Types (Addr)
 import qualified EVM.Concrete(Word(..))
 
 import Echidna.ABI (SolCall, mkGenDict)
@@ -226,8 +226,8 @@ integrationTests = testGroup "Solidity Integration Testing"
       [ ("echidna_test passed",                    solved      "echidna_test") ]
   , testContract "basic/gasuse.sol"       (Just "basic/gasuse.yaml")
       [ ("echidna_true failed",                    passed     "echidna_true")
-      , ("g gas estimate wrong",                   gasInRange "g" 12000000 80000000)
-      , ("f_close1 gas estimate wrong",            gasInRange "f_close1" 5000 7000)
+      , ("g gas estimate wrong",                   gasInRange "g" 15000000 40000000)
+      , ("f_close1 gas estimate wrong",            gasInRange "f_close1" 1800 2000)
       , ("f_open1 gas estimate wrong",             gasInRange "f_open1"  18000 23000)
       , ("push_b gas estimate wrong",              gasInRange "push_b"   39000 45000)
       ]
@@ -263,7 +263,7 @@ runContract fp n c =
     (v,w,ts) <- loadSolTests (fp NE.:| []) n
     cs  <- Echidna.Solidity.contracts (fp NE.:| [])
     ads <- NE.toList <$> addresses
-    let ads' = AbiAddress . addressWord160 <$> v ^. env . EVM.contracts . to keys
+    let ads' = AbiAddress <$> v ^. env . EVM.contracts . to keys
     campaign (pure ()) v w ts (Just $ mkGenDict 0.15 (extractConstants cs ++ ads ++ ads') [] g (returnTypes cs)) []
 
 getResult :: Text -> Campaign -> Maybe TestState
@@ -309,14 +309,14 @@ instance Arbitrary EVM.Concrete.Word where
   arbitrary = fromInteger <$> arbitrary
 
 instance Arbitrary TxCall where
-  arbitrary = do 
+  arbitrary = do
                 s <- arbitrary
-                cs <- arbitrary
+                cs <- resize 32 arbitrary
                 return $ SolCall (pack s, cs)
 
 instance Arbitrary Tx where
   arbitrary = let a :: Arbitrary a => Gen a
-                  a = arbitrary in 
+                  a = arbitrary in
                 Tx <$> a <*> a <*> a <*> a <*> a <*> a <*> a
 
 encodingJSONTests :: TestTree
diff --git a/stack.yaml b/stack.yaml
index 042f76789..dee760cb2 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,14 +1,15 @@
-resolver: lts-12.10
+resolver: lts-14.27
 
 packages:
 - '.'
 
 extra-deps:
 - git: https://github.com/dapphub/dapptools.git
-  commit: 2cc059b49cae613025b925f0273b906e25484b68
+  commit: af84e2ee0a0654fdaa91186384233cf1731ee7ce
   subdirs:
   - src/hevm
 
+- brick-0.46
 - ghci-pretty-0.0.2
 - multiset-0.3.4.1
 - restless-git-0.7
@@ -20,6 +21,8 @@ extra-deps:
 - ipprint-0.6
 - sr-extra-1.46.3.2
 - Unixutils-1.54.1
+- witherable-0.3.5
+- witherable-class-0
 - github: dmjio/semver-range
   commit: d8d9db892ddb6ae267c9bcbc4f6602668433f12a