diff --git a/.travis.yml b/.travis.yml
index b171cc73..54b4c20a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -71,7 +71,7 @@ install:
   - grep -Ev -- '^\s*--' ${HOME}/.cabal/config | grep -Ev '^\s*$'
   - "printf 'packages: \"servant\" \"servant-client\" \"servant-client-core\" \"servant-docs\" \"servant-foreign\" \"servant-server\" \"doc/tutorial\" \"servant-machines\" \"servant-conduit\" \"servant-pipes\" \"doc/cookbook/basic-auth\" \"doc/cookbook/curl-mock\" \"doc/cookbook/basic-streaming\" \"doc/cookbook/db-postgres-pool\" \"doc/cookbook/db-sqlite-simple\" \"doc/cookbook/file-upload\" \"doc/cookbook/generic\" \"doc/cookbook/hoist-server-with-context\" \"doc/cookbook/https\" \"doc/cookbook/jwt-and-basic-auth\" \"doc/cookbook/sentry\" \"doc/cookbook/testing\" \"doc/cookbook/structuring-apis\" \"doc/cookbook/using-custom-monad\" \"doc/cookbook/using-free-client\"\\n' > cabal.project"
   - "echo 'constraints: foundation >=0.0.14,memory <0.14.12 || >0.14.12' >> cabal.project"
-  - "echo 'allow-newer: servant-js:base, servant-pagination:servant,servant-pagination:servant-server' >> cabal.project"
+  - "echo 'allow-newer: servant-js:base, servant-pagination:servant, servant-pagination:servant-server,servant-multipart:servant, servant-multipart:servant-server,servant-quickcheck:servant, servant-quickcheck:servant-client, servant-quickcheck:servant-server,servant-auth-server:servant, servant-auth-server:servant-server,servant-js:servant, servant-js:servant-foreign,servant-quickcheck:hspec' >> cabal.project"
   - touch cabal.project.local
   - "if ! $NOINSTALLEDCONSTRAINTS; then for pkg in $($HCPKG list --simple-output); do echo $pkg  | grep -vw -- servant | grep -vw -- servant-client | grep -vw -- servant-client-core | grep -vw -- servant-docs | grep -vw -- servant-foreign | grep -vw -- servant-server | grep -vw -- tutorial | grep -vw -- servant-machines | grep -vw -- servant-conduit | grep -vw -- servant-pipes | grep -vw -- cookbook-basic-auth | grep -vw -- cookbook-curl-mock | grep -vw -- cookbook-basic-streaming | grep -vw -- cookbook-db-postgres-pool | grep -vw -- cookbook-db-sqlite-simple | grep -vw -- cookbook-file-upload | grep -vw -- cookbook-generic | grep -vw -- cookbook-hoist-server-with-context | grep -vw -- cookbook-https | grep -vw -- cookbook-jwt-and-basic-auth | grep -vw -- cookbook-sentry | grep -vw -- cookbook-testing | grep -vw -- cookbook-structuring-apis | grep -vw -- cookbook-using-custom-monad | grep -vw -- cookbook-using-free-client | sed 's/^/constraints: /' | sed 's/-[^-]*$/ installed/' >> cabal.project.local; done; fi"
   - cat cabal.project || true
@@ -168,7 +168,7 @@ script:
   - find . -maxdepth 1 -name '*.tar.gz' -exec tar -xvf '{}' \;
   - "printf 'packages: servant-*/*.cabal servant-client-*/*.cabal servant-client-core-*/*.cabal servant-docs-*/*.cabal servant-foreign-*/*.cabal servant-server-*/*.cabal tutorial-*/*.cabal servant-machines-*/*.cabal servant-conduit-*/*.cabal servant-pipes-*/*.cabal cookbook-basic-auth-*/*.cabal cookbook-curl-mock-*/*.cabal cookbook-basic-streaming-*/*.cabal cookbook-db-postgres-pool-*/*.cabal cookbook-db-sqlite-simple-*/*.cabal cookbook-file-upload-*/*.cabal cookbook-generic-*/*.cabal cookbook-hoist-server-with-context-*/*.cabal cookbook-https-*/*.cabal cookbook-jwt-and-basic-auth-*/*.cabal cookbook-sentry-*/*.cabal cookbook-testing-*/*.cabal cookbook-structuring-apis-*/*.cabal cookbook-using-custom-monad-*/*.cabal cookbook-using-free-client-*/*.cabal\\n' > cabal.project"
   - "echo 'constraints: foundation >=0.0.14,memory <0.14.12 || >0.14.12' >> cabal.project"
-  - "echo 'allow-newer: servant-js:base, servant-pagination:servant,servant-pagination:servant-server' >> cabal.project"
+  - "echo 'allow-newer: servant-js:base, servant-pagination:servant, servant-pagination:servant-server,servant-multipart:servant, servant-multipart:servant-server,servant-quickcheck:servant, servant-quickcheck:servant-client, servant-quickcheck:servant-server,servant-auth-server:servant, servant-auth-server:servant-server,servant-js:servant, servant-js:servant-foreign,servant-quickcheck:hspec' >> cabal.project"
   - touch cabal.project.local
   - "if ! $NOINSTALLEDCONSTRAINTS; then for pkg in $($HCPKG list --simple-output); do echo $pkg  | grep -vw -- servant | grep -vw -- servant-client | grep -vw -- servant-client-core | grep -vw -- servant-docs | grep -vw -- servant-foreign | grep -vw -- servant-server | grep -vw -- tutorial | grep -vw -- servant-machines | grep -vw -- servant-conduit | grep -vw -- servant-pipes | grep -vw -- cookbook-basic-auth | grep -vw -- cookbook-curl-mock | grep -vw -- cookbook-basic-streaming | grep -vw -- cookbook-db-postgres-pool | grep -vw -- cookbook-db-sqlite-simple | grep -vw -- cookbook-file-upload | grep -vw -- cookbook-generic | grep -vw -- cookbook-hoist-server-with-context | grep -vw -- cookbook-https | grep -vw -- cookbook-jwt-and-basic-auth | grep -vw -- cookbook-sentry | grep -vw -- cookbook-testing | grep -vw -- cookbook-structuring-apis | grep -vw -- cookbook-using-custom-monad | grep -vw -- cookbook-using-free-client | sed 's/^/constraints: /' | sed 's/-[^-]*$/ installed/' >> cabal.project.local; done; fi"
   - cat cabal.project || true
diff --git a/cabal.project b/cabal.project
index c6ac2268..1870da50 100644
--- a/cabal.project
+++ b/cabal.project
@@ -38,5 +38,9 @@ constraints:
   memory <0.14.12 || >0.14.12
 
 allow-newer:
-  servant-pagination:servant,
-  servant-pagination:servant-server
+  servant-pagination:servant, servant-pagination:servant-server,
+  servant-multipart:servant, servant-multipart:servant-server,
+  servant-quickcheck:servant, servant-quickcheck:servant-client, servant-quickcheck:servant-server,
+  servant-auth-server:servant, servant-auth-server:servant-server,
+  servant-js:servant, servant-js:servant-foreign,
+  servant-quickcheck:hspec
diff --git a/doc/cookbook/curl-mock/CurlMock.lhs b/doc/cookbook/curl-mock/CurlMock.lhs
index a77c7917..10a6f51a 100644
--- a/doc/cookbook/curl-mock/CurlMock.lhs
+++ b/doc/cookbook/curl-mock/CurlMock.lhs
@@ -22,7 +22,7 @@ Language extensions and imports:
 {-# LANGUAGE TypeOperators              #-}
 
 import           Control.Lens                      ((^.))
-import           Data.Aeson.Compat
+import           Data.Aeson
 import           Data.Aeson.Text
 import           Data.Monoid                       ((<>))
 import           Data.Proxy                        (Proxy (Proxy))
diff --git a/doc/cookbook/curl-mock/curl-mock.cabal b/doc/cookbook/curl-mock/curl-mock.cabal
index 37b0f9a0..abbbdd14 100644
--- a/doc/cookbook/curl-mock/curl-mock.cabal
+++ b/doc/cookbook/curl-mock/curl-mock.cabal
@@ -14,7 +14,6 @@ executable cookbock-curl-mock
   main-is:             CurlMock.lhs
   build-depends:       base == 4.*
                      , aeson
-                     , aeson-compat
                      , lens
                      , text
                      , servant
diff --git a/doc/tutorial/Server.lhs b/doc/tutorial/Server.lhs
index f2a07855..a0b9b875 100644
--- a/doc/tutorial/Server.lhs
+++ b/doc/tutorial/Server.lhs
@@ -29,7 +29,7 @@ import Prelude.Compat
 
 import Control.Monad.Except
 import Control.Monad.Reader
-import Data.Aeson.Compat
+import Data.Aeson
 import Data.Aeson.Types
 import Data.Attoparsec.ByteString
 import Data.ByteString (ByteString)
diff --git a/doc/tutorial/tutorial.cabal b/doc/tutorial/tutorial.cabal
index 5cbfbeb0..af2cc681 100644
--- a/doc/tutorial/tutorial.cabal
+++ b/doc/tutorial/tutorial.cabal
@@ -36,7 +36,6 @@ library
   build-depends:
       base >= 4.7 && <4.13
     , aeson
-    , aeson-compat
     , attoparsec
     , base-compat
     , bytestring
@@ -67,11 +66,10 @@ library
     , blaze-markup >= 0.8.0.0 && < 0.9
     , cookie       >= 0.4.3   && < 0.5
     , js-jquery    >= 3.2.1   && < 3.3
-    , lucid        >= 2.9.9   && < 2.10
-    , mtl-compat   >= 0.2.1   && < 0.3
+    , lucid        >= 2.9.11  && < 2.10
     , random       >= 1.1     && < 1.2
     , servant-js   >= 0.9     && < 0.10
-    , time         >= 1.4.2   && < 1.9
+    , time         >= 1.6.0.1 && < 1.9
 
   -- For legacy tools, we need to specify build-depends too
   build-depends: markdown-unlit >= 0.5.0 && <0.6
diff --git a/servant-client-core/servant-client-core.cabal b/servant-client-core/servant-client-core.cabal
index eba1217e..fd5a0718 100644
--- a/servant-client-core/servant-client-core.cabal
+++ b/servant-client-core/servant-client-core.cabal
@@ -1,5 +1,5 @@
 name:                servant-client-core
-version:             0.14.1
+version:             0.15
 synopsis:            Core functionality and class for client function generation for servant APIs
 description:
   This library provides backend-agnostic generation of client functions. For
@@ -56,20 +56,20 @@ library
 
   -- Servant dependencies
   build-depends:
-        servant            >= 0.14.1 && <0.15
+        servant            >= 0.15 && <0.16
 
   -- Other dependencies: Lower bound around what is in the latest Stackage LTS.
   -- Here can be exceptions if we really need features from the newer versions.
   build-depends:
-      aeson                 >= 1.4.0.0  && < 1.5
-    , base-compat           >= 0.10.1   && < 0.11
+      aeson                 >= 1.4.1.0  && < 1.5
+    , base-compat           >= 0.10.5   && < 0.11
     , base64-bytestring     >= 1.0.0.1  && < 1.1
     , exceptions            >= 0.10.0   && < 0.11
-    , free                  >= 5.0.2    && < 5.2
+    , free                  >= 5.1      && < 5.2
     , generics-sop          >= 0.4.0.1  && < 0.5
-    , http-api-data         >= 0.3.8.1  && < 0.4
-    , http-media            >= 0.7.1.2  && < 0.8
-    , http-types            >= 0.12.1   && < 0.13
+    , http-api-data         >= 0.3.10   && < 0.4
+    , http-media            >= 0.7.1.3  && < 0.8
+    , http-types            >= 0.12.2   && < 0.13
     , network-uri           >= 2.6.1.0  && < 2.7
     , safe                  >= 0.3.17   && < 0.4
 
@@ -94,9 +94,9 @@ test-suite spec
 
   -- Additonal dependencies
   build-depends:
-      deepseq    >= 1.3.0.2  && < 1.5
-    , hspec      >= 2.4.1    && < 2.6
+      deepseq    >= 1.4.2.0  && < 1.5
+    , hspec      >= 2.6.0    && < 2.7
     , QuickCheck >= 2.12.6.1 && < 2.13
 
   build-tool-depends:
-    hspec-discover:hspec-discover >= 2.5.1 && <2.6
+    hspec-discover:hspec-discover >= 2.6.0 && <2.7
diff --git a/servant-client-ghcjs/servant-client-ghcjs.cabal b/servant-client-ghcjs/servant-client-ghcjs.cabal
index 17fd160a..ac44ecfd 100644
--- a/servant-client-ghcjs/servant-client-ghcjs.cabal
+++ b/servant-client-ghcjs/servant-client-ghcjs.cabal
@@ -41,12 +41,17 @@ library
     , http-media            >= 0.6.2    && < 0.8
     , http-types            >= 0.12     && < 0.13
     , monad-control         >= 1.0.0.4  && < 1.1
-    , mtl                   >= 2.1      && < 2.3
+    , mtl                   >= 2.2.2    && < 2.3
     , semigroupoids         >= 4.3      && < 5.3
-    , servant-client-core   == 0.14.*
     , string-conversions    >= 0.3      && < 0.5
     , transformers          >= 0.3      && < 0.6
     , transformers-base     >= 0.4.4    && < 0.5
+
+
+  -- strict, as we re-export stuff
+  build-depends:
+    servant-client-core   == 0.15
+
   hs-source-dirs: src
   default-language: Haskell2010
   ghc-options: -Wall
diff --git a/servant-client/servant-client.cabal b/servant-client/servant-client.cabal
index 003df90d..ebcd645e 100644
--- a/servant-client/servant-client.cabal
+++ b/servant-client/servant-client.cabal
@@ -1,5 +1,5 @@
 name:                servant-client
-version:             0.14
+version:             0.15
 synopsis: automatical derivation of querying functions for servant webservices
 description:
   This library lets you derive automatically Haskell functions that
@@ -39,34 +39,33 @@ library
 
   -- Bundled with GHC: Lower bound to not force re-installs
   -- text and mtl are bundled starting with GHC-8.4
-  --
-  -- note: mtl lower bound is so low because of GHC-7.8
   build-depends:
-      base                  >= 4.7      && < 4.13
-    , bytestring            >= 0.10.4.0 && < 0.11
-    , containers            >= 0.5.5.1  && < 0.7
-    , mtl                   >= 2.1      && < 2.3
+      base                  >= 4.9      && < 4.13
+    , bytestring            >= 0.10.8.1 && < 0.11
+    , containers            >= 0.5.7.1  && < 0.7
+    , mtl                   >= 2.2.2    && < 2.3
+    , stm                   >= 2.4.5.1  && < 2.6
     , text                  >= 1.2.3.0  && < 1.3
-    , time                  >= 1.4.2    && < 1.9
-    , transformers          >= 0.3.0.0  && < 0.6
+    , time                  >= 1.6.0.1  && < 1.9
+    , transformers          >= 0.5.2.0  && < 0.6
 
-  -- Servant dependencies
+  -- Servant dependencies.
+  -- Strict dependency on `servant-client-core` as we re-export things.
   build-depends:
-      servant               == 0.14.*
-    , servant-client-core   == 0.14.*
+      servant               == 0.15.*
+    , servant-client-core   == 0.15
 
   -- Other dependencies: Lower bound around what is in the latest Stackage LTS.
   -- Here can be exceptions if we really need features from the newer versions.
   build-depends:
-      base-compat           >= 0.10.1   && < 0.11
-    , http-client           >= 0.5.12   && < 0.6
-    , http-media            >= 0.7.1.2  && < 0.8
-    , http-types            >= 0.12.1   && < 0.13
+      base-compat           >= 0.10.5   && < 0.11
+    , http-client           >= 0.5.13.1 && < 0.6
+    , http-media            >= 0.7.1.3  && < 0.8
+    , http-types            >= 0.12.2   && < 0.13
     , exceptions            >= 0.10.0   && < 0.11
     , kan-extensions        >= 5.2      && < 5.3
     , monad-control         >= 1.0.2.3  && < 1.1
-    , semigroupoids         >= 5.2.2    && < 5.4
-    , stm                   >= 2.4.5.0  && < 2.6
+    , semigroupoids         >= 5.3.1    && < 5.4
     , transformers-base     >= 0.4.5.2  && < 0.5
     , transformers-compat   >= 0.6.2    && < 0.7
 
@@ -107,16 +106,16 @@ test-suite spec
   build-depends:
       entropy           >= 0.4.1.3  && < 0.5
     , generics-sop      >= 0.4.0.1  && < 0.5
-    , hspec             >= 2.5.8    && < 2.6
-    , HUnit             >= 1.6      && < 1.7
+    , hspec             >= 2.6.0    && < 2.7
+    , HUnit             >= 1.6.0.0  && < 1.7
     , network           >= 2.8.0.0  && < 2.9
     , QuickCheck        >= 2.12.6.1 && < 2.13
-    , servant           == 0.14.*
-    , servant-server    == 0.14.*
+    , servant           == 0.15.*
+    , servant-server    == 0.15.*
     , tdigest           >= 0.2     && < 0.3
 
   build-tool-depends:
-    hspec-discover:hspec-discover >= 2.5.8 && < 2.6
+    hspec-discover:hspec-discover >= 2.6.0 && < 2.7
 
 test-suite readme
   type:           exitcode-stdio-1.0
diff --git a/servant-conduit/servant-conduit.cabal b/servant-conduit/servant-conduit.cabal
index 67e76048..763088d5 100644
--- a/servant-conduit/servant-conduit.cabal
+++ b/servant-conduit/servant-conduit.cabal
@@ -26,12 +26,12 @@ library
   exposed-modules:     Servant.Conduit
   build-depends:
       base          >=4.9      && <5
-    , bytestring    >=0.10.4.0 && <0.11
-    , conduit       >=1.3.0.2  && <1.4
-    , mtl           >=2.1      && <2.3
-    , resourcet     >=1.2.1    && <1.3
-    , servant       >=0.14     && <0.15
-    , unliftio-core >=0.1.1    && <0.2
+    , bytestring    >=0.10.8.1 && <0.11
+    , conduit       >=1.3.1    && <1.4
+    , mtl           >=2.2.2    && <2.3
+    , resourcet     >=1.2.2    && <1.3
+    , servant       >=0.15     && <0.16
+    , unliftio-core >=0.1.2.0  && <0.2
   hs-source-dirs:      src
   default-language:    Haskell2010
   ghc-options: -Wall
@@ -51,9 +51,9 @@ test-suite example
     , resourcet
     , servant
     , servant-conduit
-    , servant-server >=0.14     && <0.15
-    , servant-client >=0.14     && <0.15
-    , wai            >=3.0.3.0  && <3.3
-    , warp           >=3.0.13.1 && <3.3
+    , servant-server >=0.15     && <0.16
+    , servant-client >=0.15     && <0.16
+    , wai            >=3.2.1.2  && <3.3
+    , warp           >=3.2.25   && <3.3
     , http-client
   default-language: Haskell2010
diff --git a/servant-docs/servant-docs.cabal b/servant-docs/servant-docs.cabal
index 1bc4a677..7d321449 100644
--- a/servant-docs/servant-docs.cabal
+++ b/servant-docs/servant-docs.cabal
@@ -1,6 +1,5 @@
 name:                servant-docs
-version:             0.11.2
-x-revision:          5
+version:             0.11.3
 synopsis:            generate API docs for your servant webservice
 description:
   Library for generating API docs from a servant API definition.
@@ -43,28 +42,28 @@ library
   --
   -- note: mtl lower bound is so low because of GHC-7.8
   build-depends:
-      base       >= 4.7      && < 4.13
-    , bytestring >= 0.10.4.0 && < 0.11
+      base       >= 4.9      && < 4.13
+    , bytestring >= 0.10.8.1 && < 0.11
     , text       >= 1.2.3.0  && < 1.3
 
   -- Servant dependencies
   build-depends:
-      servant            == 0.13.* || ==0.14.*
+      servant            == 0.15.*
 
   -- Other dependencies: Lower bound around what is in the latest Stackage LTS.
   -- Here can be exceptions if we really need features from the newer versions.
   build-depends:
-      aeson                >= 1.2.3.0  && < 1.5
+      aeson                >= 1.4.1.0  && < 1.5
     , aeson-pretty         >= 0.8.5    && < 0.9
-    , base-compat          >= 0.9.3    && < 0.11
-    , case-insensitive     >= 1.2.0.10 && < 1.3
+    , base-compat          >= 0.10.5   && < 0.11
+    , case-insensitive     >= 1.2.0.11 && < 1.3
     , control-monad-omega  >= 0.3.1    && < 0.4
-    , hashable             >= 1.2.6.1  && < 1.3
-    , http-media           >= 0.7.0    && < 0.8
-    , http-types           >= 0.12     && < 0.13
-    , lens                 >= 4.15.4   && < 4.18
+    , hashable             >= 1.2.7.0  && < 1.3
+    , http-media           >= 0.7.1.3  && < 0.8
+    , http-types           >= 0.12.2   && < 0.13
+    , lens                 >= 4.17     && < 4.18
     , string-conversions   >= 0.4.0.1  && < 0.5
-    , unordered-containers >= 0.2.8.0  && < 0.3
+    , unordered-containers >= 0.2.9.0  && < 0.3
 
   hs-source-dirs: src
   default-language: Haskell2010
diff --git a/servant-foreign/servant-foreign.cabal b/servant-foreign/servant-foreign.cabal
index 3f9ede0d..1e7b4093 100644
--- a/servant-foreign/servant-foreign.cabal
+++ b/servant-foreign/servant-foreign.cabal
@@ -1,6 +1,5 @@
 name:                servant-foreign
-version:             0.11.1
-x-revision:          3
+version:             0.15
 synopsis:            Helpers for generating clients for servant APIs in any programming language
 description:
   Helper types and functions for generating client functions for servant APIs in any programming language
@@ -42,19 +41,19 @@ library
   --
   -- note: mtl lower bound is so low because of GHC-7.8
   build-depends:
-      base        >= 4.7     && <4.13
+      base        >= 4.9     && < 4.13
     , text        >= 1.2.3.0 && < 1.3
 
   -- Servant dependencies
   build-depends:
-      servant            == 0.13.* || ==0.14.*
+      servant            == 0.15.*
 
   -- Other dependencies: Lower bound around what is in the latest Stackage LTS.
   -- Here can be exceptions if we really need features from the newer versions.
   build-depends:
-      base-compat >= 0.9.3  && <0.11
-    , lens        >= 4.15.4 && <4.18
-    , http-types  >= 0.12   && < 0.13
+      base-compat >= 0.10.5  && < 0.11
+    , lens        >= 4.17    && < 4.18
+    , http-types  >= 0.12.2  && < 0.13
 
   hs-source-dirs:      src
   default-language:    Haskell2010
@@ -75,8 +74,8 @@ test-suite spec
 
   -- Additonal dependencies
   build-depends:
-    hspec >= 2.4.4 && <2.6
+    hspec >= 2.6.0 && <2.7
 
   build-tool-depends:
-    hspec-discover:hspec-discover >=2.4.4 && <2.6
+    hspec-discover:hspec-discover >=2.6.0 && <2.7
   default-language:  Haskell2010
diff --git a/servant-machines/servant-machines.cabal b/servant-machines/servant-machines.cabal
index 80a68dec..b86c3494 100644
--- a/servant-machines/servant-machines.cabal
+++ b/servant-machines/servant-machines.cabal
@@ -26,10 +26,10 @@ library
   exposed-modules:     Servant.Machines
   build-depends:
       base          >=4.9      && <5
-    , bytestring    >=0.10.4.0 && <0.11
-    , machines      >=0.6.3    && <0.7
-    , mtl           >=2.1      && <2.3
-    , servant       >=0.14     && <0.15
+    , bytestring    >=0.10.8.1 && <0.11
+    , machines      >=0.6.4    && <0.7
+    , mtl           >=2.2.2    && <2.3
+    , servant       >=0.15     && <0.16
   hs-source-dirs:      src
   default-language:    Haskell2010
   ghc-options: -Wall
@@ -48,9 +48,9 @@ test-suite example
     , servant
     , machines
     , servant-machines
-    , servant-server >=0.14     && <0.15
-    , servant-client >=0.14     && <0.15
-    , wai            >=3.0.3.0  && <3.3
-    , warp           >=3.0.13.1 && <3.3
+    , servant-server >=0.15     && <0.16
+    , servant-client >=0.15     && <0.16
+    , wai            >=3.2.1.2  && <3.3
+    , warp           >=3.2.25   && <3.3
     , http-client
   default-language: Haskell2010
diff --git a/servant-pipes/servant-pipes.cabal b/servant-pipes/servant-pipes.cabal
index 8a4e2e45..9d6f7344 100644
--- a/servant-pipes/servant-pipes.cabal
+++ b/servant-pipes/servant-pipes.cabal
@@ -26,12 +26,12 @@ library
   exposed-modules:     Servant.Pipes
   build-depends:
       base          >=4.9      && <5
-    , bytestring    >=0.10.4.0 && <0.11
+    , bytestring    >=0.10.8.1 && <0.11
     , pipes         >=4.3.9    && <4.4
     , pipes-safe    >=2.3.1    && <2.4
-    , mtl           >=2.1      && <2.3
+    , mtl           >=2.2.2    && <2.3
     , monad-control >=1.0.2.3  && <1.1
-    , servant       >=0.14     && <0.15
+    , servant       >=0.15     && <0.16
   hs-source-dirs:      src
   default-language:    Haskell2010
   ghc-options: -Wall
@@ -51,10 +51,10 @@ test-suite example
     , pipes 
     , pipes-safe
     , servant-pipes
-    , pipes-bytestring  >= 2.1.6   && <2.2
-    , servant-server    >=0.14     && <0.15
-    , servant-client    >=0.14     && <0.15
-    , wai               >=3.0.3.0  && <3.3
-    , warp              >=3.0.13.1 && <3.3
+    , pipes-bytestring  >=2.1.6    && <2.2
+    , servant-server    >=0.15     && <0.16
+    , servant-client    >=0.15     && <0.16
+    , wai               >=3.2.1.2  && <3.3
+    , warp              >=3.2.25   && <3.3
     , http-client
   default-language: Haskell2010
diff --git a/servant-server/example/greet.hs b/servant-server/example/greet.hs
index 662c2c33..e354351f 100644
--- a/servant-server/example/greet.hs
+++ b/servant-server/example/greet.hs
@@ -5,8 +5,10 @@
 {-# LANGUAGE TypeFamilies      #-}
 {-# LANGUAGE TypeOperators     #-}
 
+import           Prelude ()
+import           Prelude.Compat
+
 import           Data.Aeson
-import           Data.Monoid
 import           Data.Proxy
 import           Data.Text
 import           GHC.Generics
diff --git a/servant-server/servant-server.cabal b/servant-server/servant-server.cabal
index 901f2fb2..c156f1bd 100644
--- a/servant-server/servant-server.cabal
+++ b/servant-server/servant-server.cabal
@@ -1,5 +1,5 @@
 name:                servant-server
-version:             0.14.1
+version:             0.15
 synopsis:            A family of combinators for defining webservices APIs and serving them
 description:
   A family of combinators for defining webservices APIs and serving them
@@ -61,44 +61,37 @@ library
 
   -- Bundled with GHC: Lower bound to not force re-installs
   -- text and mtl are bundled starting with GHC-8.4
-  --
-  -- note: mtl lower bound is so low because of GHC-7.8
   build-depends:
-      base               >= 4.7      && < 4.13
-    , bytestring         >= 0.10.4.0 && < 0.11
-    , containers         >= 0.5.5.1  && < 0.7
-    , mtl                >= 2.1      && < 2.3
+      base               >= 4.9      && < 4.13
+    , bytestring         >= 0.10.8.1 && < 0.11
+    , containers         >= 0.5.7.1  && < 0.7
+    , mtl                >= 2.2.2    && < 2.3
     , text               >= 1.2.3.0  && < 1.3
-    , transformers       >= 0.3.0.0  && < 0.6
-    , filepath           >= 1.3.0.2  && < 1.5
-
-  if !impl(ghc >= 8.0)
-    build-depends:
-      semigroups            >= 0.18.4 && < 0.19
+    , transformers       >= 0.5.2.0  && < 0.6
+    , filepath           >= 1.4.1.1  && < 1.5
 
   -- Servant dependencies
   build-depends:
-      servant            >= 0.14.1 && <0.15
+      servant            >= 0.15 && < 0.16
 
   -- Other dependencies: Lower bound around what is in the latest Stackage LTS.
   -- Here can be exceptions if we really need features from the newer versions.
   build-depends:
-      base-compat         >= 0.10.1   && < 0.11
+      base-compat         >= 0.10.5   && < 0.11
     , base64-bytestring   >= 1.0.0.1  && < 1.1
     , exceptions          >= 0.10.0   && < 0.11
-    , http-api-data       >= 0.3.8.1  && < 0.4
-    , http-media          >= 0.7.1.2  && < 0.8
-    , http-types          >= 0.12.1   && < 0.13
+    , http-api-data       >= 0.3.10   && < 0.4
+    , http-media          >= 0.7.1.3  && < 0.8
+    , http-types          >= 0.12.2   && < 0.13
     , network-uri         >= 2.6.1.0  && < 2.7
     , monad-control       >= 1.0.2.3  && < 1.1
-    , network             >= 2.6.3.5  && < 2.9
+    , network             >= 2.8      && < 2.9
     , string-conversions  >= 0.4.0.1  && < 0.5
-    , resourcet           >= 1.1.11   && < 1.3
-    , tagged              >= 0.8.5    && < 0.9
-    , transformers-base   >= 0.4.4    && < 0.5
-    , transformers-compat >= 0.6.2    && < 0.7
-    , wai                 >= 3.2.1.1  && < 3.3
-    , wai-app-static      >= 3.1.6.1  && < 3.2
+    , resourcet           >= 1.2.2    && < 1.3
+    , tagged              >= 0.8.6    && < 0.9
+    , transformers-base   >= 0.4.5.2  && < 0.5
+    , wai                 >= 3.2.1.2  && < 3.3
+    , wai-app-static      >= 3.1.6.2  && < 3.2
     , word8               >= 0.1.3    && < 0.2
 
   hs-source-dirs: src
@@ -112,14 +105,15 @@ executable greet
   default-language: Haskell2010
   build-depends:
       base
+    , base-compat
     , servant
     , servant-server
     , wai
     , text
 
   build-depends:
-      aeson               >= 1.3.1.1  && < 1.5
-    , warp                >= 3.2.13   && < 3.3
+      aeson               >= 1.4.1.0  && < 1.5
+    , warp                >= 3.2.25   && < 3.3
 
 test-suite spec
   type: exitcode-stdio-1.0
@@ -160,17 +154,17 @@ test-suite spec
 
   -- Additonal dependencies
   build-depends:
-      aeson                >= 1.3.1.1  && < 1.5
-    , directory            >= 1.2.1.0  && < 1.4
-    , hspec                >= 2.5.1    && < 2.6
+      aeson                >= 1.4.1.0  && < 1.5
+    , directory            >= 1.3.0.0  && < 1.4
+    , hspec                >= 2.6.0    && < 2.7
     , hspec-wai            >= 0.9.0    && < 0.10
     , QuickCheck           >= 2.12.6.1 && < 2.13
     , should-not-typecheck >= 2.1.0    && < 2.2
     , temporary            >= 1.3      && < 1.4
-    , wai-extra            >= 3.0.21.0 && < 3.1
+    , wai-extra            >= 3.0.24.3 && < 3.1
 
   build-tool-depends:
-    hspec-discover:hspec-discover >= 2.5.1 && <2.6
+    hspec-discover:hspec-discover >= 2.6.0 && <2.7
 
 test-suite doctests
   build-depends:
diff --git a/servant-server/src/Servant/Server/Internal/Router.hs b/servant-server/src/Servant/Server/Internal/Router.hs
index 8322b627..c73d76d8 100644
--- a/servant-server/src/Servant/Server/Internal/Router.hs
+++ b/servant-server/src/Servant/Server/Internal/Router.hs
@@ -4,10 +4,12 @@
 {-# LANGUAGE OverloadedStrings #-}
 module Servant.Server.Internal.Router where
 
+import           Prelude ()
+import           Prelude.Compat
+
 import           Data.Map
                  (Map)
 import qualified Data.Map                                   as M
-import           Data.Monoid
 import           Data.Text
                  (Text)
 import qualified Data.Text                                  as T
diff --git a/servant/servant.cabal b/servant/servant.cabal
index 00cdff18..99b1f7f7 100644
--- a/servant/servant.cabal
+++ b/servant/servant.cabal
@@ -1,5 +1,5 @@
 name:                servant
-version:             0.14.1
+version:             0.15
 synopsis:            A family of combinators for defining webservices APIs
 description:
   A family of combinators for defining webservices APIs and serving them
@@ -86,31 +86,27 @@ library
   build-depends:
       base                  >= 4.9      && < 4.13
     , bytestring            >= 0.10.8.1 && < 0.11
-    , mtl                   >= 2.1      && < 2.3
-    , transformers          >= 0.3.0.0  && < 0.6
+    , mtl                   >= 2.2.2    && < 2.3
+    , transformers          >= 0.5.2.0  && < 0.6
     , text                  >= 1.2.3.0  && < 1.3
 
-  if !impl(ghc >= 8.0)
-    build-depends:
-      semigroups            >= 0.18.5 && < 0.19
-
   -- Other dependencies: Lower bound around what is in the latest Stackage LTS.
   -- Here can be exceptions if we really need features from the newer versions.
   build-depends:
       base-compat            >= 0.10.5   && < 0.11
-    , aeson                  >= 1.3.1.1  && < 1.5
+    , aeson                  >= 1.4.1.0  && < 1.5
     , attoparsec             >= 0.13.2.2 && < 0.14
     , bifunctors             >= 5.5.3    && < 5.6
     , case-insensitive       >= 1.2.0.11 && < 1.3
-    , http-api-data          >= 0.3.8.1  && < 0.4
-    , http-media             >= 0.7.1.2  && < 0.8
-    , http-types             >= 0.12.1   && < 0.13
+    , http-api-data          >= 0.3.10   && < 0.4
+    , http-media             >= 0.7.1.3  && < 0.8
+    , http-types             >= 0.12.2   && < 0.13
     , mmorph                 >= 1.1.2    && < 1.2
     , network-uri            >= 2.6.1.0  && < 2.7
     , singleton-bool         >= 0.1.4    && < 0.2
     , string-conversions     >= 0.4.0.1  && < 0.5
-    , tagged                 >= 0.8.5    && < 0.9
-    , vault                  >= 0.3.1.1  && < 0.4
+    , tagged                 >= 0.8.6    && < 0.9
+    , vault                  >= 0.3.1.2  && < 0.4
 
   hs-source-dirs: src
   default-language: Haskell2010
@@ -161,13 +157,12 @@ test-suite spec
 
   -- Additonal dependencies
   build-depends:
-      aeson-compat         >= 0.3.8    && < 0.4
-    , hspec                >= 2.5.4    && < 2.6
+      hspec                >= 2.6.0    && < 2.7
     , QuickCheck           >= 2.12.6.1 && < 2.13
     , quickcheck-instances >= 0.3.19   && < 0.4
 
   build-tool-depends:
-    hspec-discover:hspec-discover >= 2.5.4 && < 2.6
+    hspec-discover:hspec-discover >= 2.6.0 && < 2.7
 
 test-suite doctests
   build-depends:
@@ -177,7 +172,7 @@ test-suite doctests
 
   -- We test Links failure with doctest, so we need extra dependencies
   build-depends:
-      hspec                >= 2.5.4  && < 2.6
+      hspec                >= 2.6.0  && < 2.7
 
   type: exitcode-stdio-1.0
   main-is: test/doctests.hs
diff --git a/servant/test/Servant/API/ContentTypesSpec.hs b/servant/test/Servant/API/ContentTypesSpec.hs
index 7a1fe589..ecfcd7a2 100644
--- a/servant/test/Servant/API/ContentTypesSpec.hs
+++ b/servant/test/Servant/API/ContentTypesSpec.hs
@@ -10,7 +10,8 @@ module Servant.API.ContentTypesSpec where
 import           Prelude ()
 import           Prelude.Compat
 
-import           Data.Aeson.Compat
+import           Data.Aeson
+                 (FromJSON, ToJSON (..), Value, decode, encode, object, (.=))
 import           Data.ByteString.Char8
                  (ByteString, append, pack)
 import qualified Data.ByteString.Lazy                             as BSL
diff --git a/stack.yaml b/stack.yaml
index c09ce0eb..a2eee048 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -16,10 +16,18 @@ packages:
 # - doc/tutorial/
 
 extra-deps:
+- base-compat-0.10.5
+- conduit-1.3.1
 - generics-sop-0.4.0.1
-- sop-core-0.4.0.0
-- QuickCheck-2.12.6.1
+- hspec-2.6.0
+- hspec-core-2.6.0
+- hspec-discover-2.6.0
+- http-api-data-0.3.10
+- http-media-0.7.1.3
 - network-2.8.0.0
-- hspec-2.5.8
-- hspec-core-2.5.8
-- hspec-discover-2.5.8
+- pipes-safe-2.3.1
+- QuickCheck-2.12.6.1
+- resourcet-1.2.2
+- sop-core-0.4.0.0
+- wai-extra-3.0.24.3
+- tasty-1.1.0.4