diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+# 0.0.0.3
+
+Support GHC 8.6 and its newer `containers` and `base`.
+
 # 0.0.0.2
 
 Add a `Lower` instance for `Data.Sequence.Seq`.
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+[![Build Status](https://travis-ci.com/robrix/semilattices.svg?branch=master)](https://travis-ci.com/robrix/semilattices)
+
 # `semilattices`
 
 This Haskell package defines typeclasses for join- and meet-semilattices, and for upper and lower bounds, and a variety of instances for each.
diff --git a/semilattices.cabal b/semilattices.cabal
--- a/semilattices.cabal
+++ b/semilattices.cabal
@@ -1,5 +1,5 @@
 name:                semilattices
-version:             0.0.0.2
+version:             0.0.0.3
 synopsis:            Semilattices
 description:         Join- and meet-semilattices, with optional upper and lower bounds, and a variety of instances for each.
 homepage:            https://github.com/robrix/semilattices
@@ -16,6 +16,10 @@
   README.md
   ChangeLog.md
 
+tested-with:         GHC == 8.2.2
+                   , GHC == 8.4.4
+                   , GHC == 8.6.2
+
 library
   exposed-modules:     Data.Semilattice.Bound
                      , Data.Semilattice.Join
@@ -24,13 +28,17 @@
                      , Data.Semilattice.Order
                      , Data.Semilattice.Tumble
                      , Data.Semilattice.Upper
-  build-depends:       base >=4.9 && <4.12
-                     , containers >=0.5 && <0.6
+  build-depends:       base >=4.9 && <4.13
+                     , containers >=0.5 && <0.7
                      , hashable >=1.2 && <1.3
                      , unordered-containers >=0.2 && <0.3
   hs-source-dirs:      src
   default-language:    Haskell2010
-  ghc-options:         -Wall -fno-warn-name-shadowing
+  ghc-options:         -Weverything -Wno-missing-local-signatures -Wno-missing-import-lists -Wno-implicit-prelude -Wno-safe -Wno-unsafe -Wno-name-shadowing -Wno-monomorphism-restriction -Wno-missed-specialisations -Wno-all-missed-specialisations
+  if (impl(ghc >= 8.4))
+    ghc-options:       -Wno-missing-export-lists
+  if (impl(ghc >= 8.6))
+    ghc-options:       -Wno-star-is-type
 
 test-suite doctests
   type:                exitcode-stdio-1.0