diff --git a/Changelog.md b/Changelog.md
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,11 @@
+## 1.3.4 -- 2019-05-15
+
+### Other Changes
+
+* Support `semigroups-0.19`.
+
+---
+
 ## 1.3.3 -- 2018-09-30
 
 ### Other Changes
diff --git a/logging-effect.cabal b/logging-effect.cabal
--- a/logging-effect.cabal
+++ b/logging-effect.cabal
@@ -1,5 +1,5 @@
 name: logging-effect
-version: 1.3.3
+version: 1.3.4
 synopsis: A mtl-style monad transformer for general purpose & compositional logging
 homepage: https://github.com/ocharles/logging-effect
 license: BSD3
@@ -26,7 +26,7 @@
                      , prettyprinter >= 1.2 && < 1.3
                      , monad-control >= 1.0.0.4 && < 1.1
                      , transformers-base >= 0.4.4 && < 0.5
-                     , semigroups >= 0.16.2.2 && < 0.19
+                     , semigroups >= 0.16.2.2 && < 0.20
                      , unliftio-core >= 0.1.1.0 && < 0.2
   hs-source-dirs:      src
   default-language:    Haskell2010
diff --git a/src/Control/Monad/Log.hs b/src/Control/Monad/Log.hs
--- a/src/Control/Monad/Log.hs
+++ b/src/Control/Monad/Log.hs
@@ -92,7 +92,7 @@
 import Control.Monad.Trans.Reader (ReaderT(..))
 import Control.Monad.Trans.State.Strict (StateT(..))
 import Control.Monad.Writer.Class (MonadWriter(..))
-import Data.Semigroup
+import Data.Semigroup ((<>))
 import Data.Time (UTCTime, getCurrentTime)
 #if !MIN_VERSION_base(4, 9, 0)
 import GHC.SrcLoc (SrcLoc, showSrcLoc)
@@ -101,7 +101,6 @@
 import GHC.Stack (SrcLoc, CallStack, getCallStack, prettySrcLoc)
 #endif
 import System.IO (Handle, hFlush)
-import GHC.IO.Handle.FD (stdin, stdout, stderr)
 import qualified Data.Text.Lazy as LT
 import qualified Data.Text.Prettyprint.Doc as PP
 import qualified Data.Text.Prettyprint.Doc.Render.Text as PP