diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,8 @@
+## 0.1.6.0
+
+* Make PVP compliant.
+* Support hsyslog-4 or better.
+
 ## 0.1.5.0
 
 * Allow custom logger name and facility.
diff --git a/System/Log/MonadLogger/Syslog.hs b/System/Log/MonadLogger/Syslog.hs
--- a/System/Log/MonadLogger/Syslog.hs
+++ b/System/Log/MonadLogger/Syslog.hs
@@ -69,17 +69,13 @@
     syslog
       (Just facility)
       (levelToPriority level)
-#elif MIN_VERSION_hsyslog(4,0,0)
+#else
     withSyslog defaultConfig { identifier      = BS8.pack name
                              , defaultFacility = facility
                              } $ \syslog ->
         syslog facility
             (levelToPriority level)
             (fromLogStr $ f l s level msg)
-#else
-    syslog
-        (levelToPriority level)
-        (BS8.unpack $ fromLogStr $ f l s level msg)
 #endif
 
 levelToPriority :: LogLevel -> Priority
diff --git a/monad-logger-syslog.cabal b/monad-logger-syslog.cabal
--- a/monad-logger-syslog.cabal
+++ b/monad-logger-syslog.cabal
@@ -1,5 +1,5 @@
 name:                monad-logger-syslog
-version:             0.1.5.0
+version:             0.1.6.0
 synopsis:            syslog output for monad-logger
 description:         syslog output for monad-logger
 homepage:            https://github.com/fpco/monad-logger-syslog
@@ -22,9 +22,9 @@
                        System.Log.MonadLogger.Syslog
   ghc-options:        -Wall
   build-depends:       base < 10
-                     , bytestring
-                     , fast-logger
-                     , hsyslog
-                     , monad-logger
-                     , text
-                     , transformers
+                     , bytestring          >= 0.10.8 && < 0.11
+                     , fast-logger         >= 2.4.7 && < 2.5
+                     , text                >= 1.2.2 && < 1.3
+                     , hsyslog             >= 4     && < 5.1
+                     , monad-logger        >= 0.3.20 && < 0.4
+                     , transformers        >= 0.5.2 && < 0.6