diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,12 @@
 [The latest version of this document is on GitHub.](https://github.com/haskell-servant/servant/blob/master/servant-client-core/CHANGELOG.md)
 [Changelog for `servant` package contains significant entries for all core packages.](https://github.com/haskell-servant/servant/blob/master/servant/CHANGELOG.md)
 
+0.13.0.1
+--------
+
+- Support `base-compat-0.10`
+
+
 0.13
 ----
 
diff --git a/servant-client-core.cabal b/servant-client-core.cabal
--- a/servant-client-core.cabal
+++ b/servant-client-core.cabal
@@ -1,5 +1,5 @@
 name:                servant-client-core
-version:             0.13
+version:             0.13.0.1
 synopsis:            Core functionality and class for client function generation for servant APIs
 description:
   This library provides backend-agnostic generation of client functions. For
@@ -19,10 +19,11 @@
   CHANGELOG.md
   README.md
 tested-with:
-  GHC==7.8.4
-  GHC==7.10.3
-  GHC==8.0.2
-  GHC==8.2.2
+  GHC==7.8.4,
+  GHC==7.10.3,
+  GHC==8.0.2,
+  GHC==8.2.2,
+  GHC==8.4.1
 
 source-repository head
   type:              git
@@ -45,7 +46,7 @@
   --
   -- note: mtl lower bound is so low because of GHC-7.8
   build-depends:
-      base                  >= 4.7      && < 4.11
+      base                  >= 4.7      && < 4.12
     , bytestring            >= 0.10.4.0 && < 0.11
     , containers            >= 0.5.5.1  && < 0.6
     , mtl                   >= 2.1      && < 2.3
@@ -62,12 +63,12 @@
   -- 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    && < 0.10
+      base-compat           >= 0.9.3    && < 0.11
     , base64-bytestring     >= 1.0.0.1  && < 1.1
-    , exceptions            >= 0.8.3    && < 0.9
+    , exceptions            >= 0.8.3    && < 0.11
     , generics-sop          >= 0.3.1.0  && < 0.4
     , http-api-data         >= 0.3.7.1  && < 0.4
-    , http-media            >= 0.7.1.1  && < 0.8
+    , http-media            >= 0.7.0    && < 0.8
     , http-types            >= 0.12     && < 0.13
     , network-uri           >= 2.6.1.0  && < 2.7
     , safe                  >= 0.3.15   && < 0.4
@@ -95,8 +96,8 @@
   -- Additonal dependencies
   build-depends:
       deepseq    >= 1.3.0.2 && <1.5
-    , hspec      >= 2.4.4   && <2.5
+    , hspec      >= 2.4.4   && <2.6
     , QuickCheck >= 2.10.1  && < 2.12
 
   build-tool-depends:
-    hspec-discover:hspec-discover >= 2.4.4 && <2.5
+    hspec-discover:hspec-discover >= 2.4.4 && <2.6
diff --git a/src/Servant/Client/Core/Internal/HasClient.hs b/src/Servant/Client/Core/Internal/HasClient.hs
--- a/src/Servant/Client/Core/Internal/HasClient.hs
+++ b/src/Servant/Client/Core/Internal/HasClient.hs
@@ -21,8 +21,8 @@
 import           Data.Foldable                          (toList)
 import qualified Data.ByteString.Lazy                   as BL
 import           Data.List                              (foldl')
-import           Data.Monoid                            ((<>))
 import           Data.Proxy                             (Proxy (Proxy))
+import           Data.Semigroup                         ((<>))
 import           Data.Sequence                          (fromList)
 import           Data.String                            (fromString)
 import           Data.Text                              (Text, pack)