diff --git a/CHANGELOG.md b/CHANGELOG.md
index cc0afec7f..36292b30b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -45,6 +45,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   as the only check is that the size allocated is less than $2**{64}$, but that is too large to fit in memory. Now,
   we check more stringently, and still return an IllegalOverflow
 - Fixed `--root` option for the `test` subcommand
+- Use `-Wunused-packages` and eliminate unused deps.
 
 ## Added
 
diff --git a/hevm.cabal b/hevm.cabal
index 558958dd2..f1c6681dc 100644
--- a/hevm.cabal
+++ b/hevm.cabal
@@ -51,9 +51,13 @@ source-repository head
 
 common shared
   if flag(ci)
-    ghc-options: -Werror
+    ghc-options:
+      -Werror
+      -- FIXME: we have to disable this, due to ghc bug: https://gitlab.haskell.org/ghc/ghc/-/issues/24120
+      -Wno-unused-packages
   if flag(devel)
-    ghc-options: -j
+    ghc-options:
+      -j
   if flag(debug)
     ghc-options:
       -j
@@ -66,6 +70,7 @@ common shared
     -Wno-unticked-promoted-constructors
     -Wno-orphans
     -Wno-ambiguous-fields
+    -Wunused-packages
     -optc-Wno-ignored-attributes
     -fspecialize-aggressively
     -fexpose-all-unfoldings
@@ -136,10 +141,8 @@ library
   build-depends:
     system-cxx-std-lib                >= 1.0 && < 2.0,
     QuickCheck                        >= 2.13.2 && < 2.15,
-    quickcheck-text                   >= 0.1.2 && < 0.2,
     Decimal                           >= 0.5.1 && < 0.6,
     containers                        >= 0.6.0 && < 0.7,
-    time                              >= 1.11 && < 1.14,
     transformers                      >= 0.5 && < 0.7,
     tree-view                         >= 0.5 && < 0.6,
     aeson                             >= 2.0.0 && < 2.2,
@@ -152,7 +155,6 @@ library
     base16                            >= 1.0 && < 1.1,
     megaparsec                        >= 9.0.0 && < 10.0,
     mtl                               >= 2.2 && < 2.4,
-    directory                         >= 1.3.3 && < 1.4,
     filepath                          >= 1.4.2 && < 1.5,
     cereal                            >= 0.5.8 && < 0.6,
     cryptonite                        >= 0.30 && < 0.31,
@@ -168,7 +170,6 @@ library
     optparse-generic                  >= 1.3.1 && < 1.6,
     pretty-hex                        >= 1.1 && < 1.2,
     rosezipper                        >= 0.2 && < 0.3,
-    witherable                        >= 0.3.5 && < 0.5,
     wreq                              >= 0.5.3 && < 0.6,
     regex-tdfa                        >= 1.2.3 && < 1.4,
     base                              >= 4.9 && < 5,
@@ -195,30 +196,14 @@ executable hevm
   autogen-modules:
     Paths_hevm
   build-depends:
-    QuickCheck,
-    aeson,
-    async,
     base,
-    base16,
-    binary,
     bytestring,
-    containers,
-    cryptonite,
     data-dword,
     directory,
     filepath,
     hevm,
-    mtl,
     optparse-generic,
-    operational,
-    process,
-    quickcheck-text,
-    regex-tdfa,
-    temporary,
     text,
-    vector,
-    stm,
-    spawn,
     optics-core,
     githash,
     witch,
@@ -236,22 +221,18 @@ common test-base
   autogen-modules:
     Paths_hevm
   build-depends:
-    HUnit,
     QuickCheck,
     quickcheck-instances,
     aeson,
     base,
-    base16,
-    binary,
     containers,
     directory,
     bytestring,
     filemanip,
     filepath,
-    here,
     hevm,
+    here,
     mtl,
-    data-dword,
     process,
     tasty,
     tasty-hunit,
@@ -259,16 +240,8 @@ common test-base
     tasty-expected-failure,
     temporary,
     text,
-    regex-tdfa,
-    regex,
-    time,
-    array,
     vector,
-    tasty-bench,
-    stm,
-    spawn,
     witherable,
-    smt2-parser,
     operational,
     optics-core,
     optics-extra,
@@ -277,16 +250,14 @@ common test-base
     exceptions
 
 library test-utils
-  import:
-    test-base
+  import: test-base
   exposed-modules:
     EVM.Test.Utils
     EVM.Test.Tracing
     EVM.Test.BlockchainTests
 
 common test-common
-  import:
-    test-base
+  import: test-base
   if flag(devel)
     ghc-options: -threaded -with-rtsopts=-N
   build-depends:
@@ -299,26 +270,29 @@ common test-common
 --- Test Suites ---
 
 test-suite test
-  import:
-    test-common
+  import: test-common
   type:
     exitcode-stdio-1.0
   main-is:
     test.hs
+  build-depends:
+    base16,
+    binary,
+    data-dword,
+    time,
+    regex
 
 -- these tests require network access so we split them into a separate test
 -- suite to make it easy to skip them when running nix-build
 test-suite rpc-tests
-  import:
-    test-common
+  import: test-common
   type:
     exitcode-stdio-1.0
   main-is:
     rpc.hs
 
 test-suite ethereum-tests
-  import:
-    test-common
+  import: test-common
   type:
     exitcode-stdio-1.0
   main-is:
@@ -347,10 +321,8 @@ benchmark bench
     bytestring,
     text,
     hevm,
-    here,
     test-utils,
     filemanip,
     filepath,
     containers,
-    mtl,
     unliftio-core