diff --git a/postgrest.cabal b/postgrest.cabal
index abe578596..a6448ff75 100644
--- a/postgrest.cabal
+++ b/postgrest.cabal
@@ -102,10 +102,8 @@ library
                     , auto-update               >= 0.1.4 && < 0.3
                     , base64-bytestring         >= 1 && < 1.3
                     , bytestring                >= 0.10.8 && < 0.13
-                    , cache                     >= 0.1.3 && < 0.2.0
                     , case-insensitive          >= 1.2 && < 1.3
                     , cassava                   >= 0.4.5 && < 0.6
-                    , clock                     >= 0.8.3 && < 0.9.0
                     , configurator-pg           >= 0.2.11 && < 0.3
                     , containers                >= 0.5.7 && < 0.7
                     , cookie                    >= 0.4.2 && < 0.6
@@ -118,11 +116,9 @@ library
                     , hasql-notifications       >= 0.2.2.2 && < 0.2.3
                     , hasql-pool                >= 1.0.1 && < 1.1
                     , hasql-transaction         >= 1.0.1 && < 1.2
-                    , heredoc                   >= 0.2 && < 0.3
                     , http-client               >= 0.7.19 && < 0.8
                     , http-types                >= 0.12.2 && < 0.13
                     , insert-ordered-containers >= 0.2.2 && < 0.3
-                    , iproute                   >= 1.7.0 && < 1.8
                     , jose-jwt                  >= 0.9.6 && < 0.11
                     , lens                      >= 4.14 && < 5.4
                     , lens-aeson                >= 1.0.1 && < 1.3
@@ -132,8 +128,6 @@ library
                     , network-uri               >= 2.6.1 && < 2.8
                     , optparse-applicative      >= 0.13 && < 0.19
                     , parsec                    >= 3.1.11 && < 3.2
-                    -- Technically unused, can be removed after updating to hasql >= 1.7
-                    , postgresql-libpq          >= 0.10
                     , prometheus-client         >= 1.1.1 && < 1.2.0
                     , protolude                 >= 0.3.1 && < 0.4
                     , regex-tdfa                >= 1.2.2 && < 1.4
@@ -151,11 +145,6 @@ library
                     , wai                       >= 3.2.1 && < 3.3
                     , wai-cors                  >= 0.2.5 && < 0.3
                     , wai-extra                 >= 3.1.8 && < 3.2
-                    -- We already depend on wai-logger >= 2.3.7 indirectly via wai-extra,
-                    -- but we want to depend on 2.4.0 which fixes 'unknownSocket' log output
-                    -- for unix sockets; this is tested in test/io/test_io.py. See
-                    -- https://github.com/kazu-yamamoto/logger/commit/3a71ca70afdbb93d4ecf0083eeba1fbbbcab3fc3
-                    , wai-logger                >= 2.4.0
                     , warp                      >= 3.3.19 && < 3.5
                     , stm                       >= 2.5 && < 3
                     , stm-hamt                  >= 1.2 && < 2
@@ -166,7 +155,7 @@ library
                       -- -optP-Wno-nonportable-include-path
                       --   prevents build failures on case-insensitive filesystems (macos),
                       --   see https://github.com/commercialhaskell/stack/issues/3918
-  ghc-options:        -Werror -Wall -fwarn-identities
+  ghc-options:        -Werror -Wall -fwarn-identities -Wunused-packages
                       -fno-spec-constr -optP-Wno-nonportable-include-path
 
   if flag(dev)
@@ -187,11 +176,10 @@ executable postgrest
   hs-source-dirs:     main
   main-is:            Main.hs
   build-depends:      base                >= 4.9 && < 4.20
-                    , containers          >= 0.5.7 && < 0.7
                     , postgrest
                     , protolude           >= 0.3.1 && < 0.4
   ghc-options:        -threaded -rtsopts "-with-rtsopts=-N -I0 -qg"
-                      -O2 -Werror -Wall -fwarn-identities
+                      -O2 -Werror -Wall -fwarn-identities -Wunused-packages
                       -fno-spec-constr -optP-Wno-nonportable-include-path
 
   if flag(dev)
@@ -291,7 +279,7 @@ test-suite spec
                     , transformers-base >= 0.4.4 && < 0.5
                     , wai               >= 3.2.1 && < 3.3
                     , wai-extra         >= 3.0.19 && < 3.2
-  ghc-options:        -threaded -O0 -Werror -Wall -fwarn-identities
+  ghc-options:        -threaded -O0 -Werror -Wall -fwarn-identities -Wunused-packages
                       -fno-spec-constr -optP-Wno-nonportable-include-path
                       -fno-warn-missing-signatures
                       -fwrite-ide-info
diff --git a/stack.yaml b/stack.yaml
index f6db01a22..7037b57ad 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -13,5 +13,4 @@ extra-deps:
   - fuzzyset-0.2.4
   - hasql-pool-1.0.1
   - jose-jwt-0.10.0
-  - postgresql-libpq-0.10.1.0
   - streaming-commons-0.2.3.1
diff --git a/stack.yaml.lock b/stack.yaml.lock
index b3d989f1d..670f75002 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -32,13 +32,6 @@ packages:
       size: 1231
   original:
     hackage: jose-jwt-0.10.0
-- completed:
-    hackage: postgresql-libpq-0.10.1.0@sha256:6b580c9d5068e78eecc13e655b2885c8e79cdacfca513c5d1e5a6b9dc61d9758,3166
-    pantry-tree:
-      sha256: ae81e7628a8f3d1ef33ace71fa0845c073c003ca7f1150cc9d9ba1e55fc84236
-      size: 1096
-  original:
-    hackage: postgresql-libpq-0.10.1.0
 - completed:
     hackage: streaming-commons-0.2.3.1@sha256:ed7999fea9e912b1211ea93d7e20a7998bf4753166370c94048885650f303bf0,4841
     pantry-tree: