diff --git a/.circleci/config.yml b/.circleci/config.yml
index eab48d4..d78d0d9 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,7 +1,7 @@
 version: 2.1
 
 orbs:
-  haskell: haskell-works/haskell-build@1.6.2
+  haskell: haskell-works/haskell-build@1.6.5
   github: haskell-works/github-release@1.2.1
   hackage: haskell-works/hackage@1.0.0
 
@@ -17,15 +17,15 @@ workflows:
           executor: haskell/ghc-8_4_4
 
       - haskell/build:
-          name: GHC 8.6.3
-          executor: haskell/ghc-8_6_3
+          name: GHC 8.6.4
+          executor: haskell/ghc-8_6_4
 
       - github/release-cabal:
           name: GitHub Release
           requires:
             - GHC 8.2.2
             - GHC 8.4.4
-            - GHC 8.6.3
+            - GHC 8.6.4
           checkout: true
           filters:
             branches:
diff --git a/.travis.yml b/.travis.yml
index ff47f44..a778b22 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -22,15 +22,15 @@ before_cache:
 
 matrix:
   include:
-    - compiler: "ghc-8.6.3"
+    - compiler: "ghc-8.6.4"
     # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.2,ghc-8.6.3], sources: [hvr-ghc]}}
+      addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.4,ghc-8.6.4], sources: [hvr-ghc]}}
     - compiler: "ghc-8.4.4"
     # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.2,ghc-8.4.4], sources: [hvr-ghc]}}
+      addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.4,ghc-8.4.4], sources: [hvr-ghc]}}
     - compiler: "ghc-8.2.2"
     # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.2,ghc-8.2.2], sources: [hvr-ghc]}}
+      addons: {apt: {packages: [ghc-ppa-tools,cabal-install-2.4,ghc-8.2.2], sources: [hvr-ghc]}}
 
 before_install:
   - HC=${CC}