diff --git a/.haskell-ci b/.haskell-ci
index bb9bd3f..fc2947c 100644
--- a/.haskell-ci
+++ b/.haskell-ci
@@ -1,8 +1,8 @@
 # compiler supported and their equivalent LTS
 compiler: ghc-8.0 lts-9.21
 compiler: ghc-8.2 lts-11.22
-compiler: ghc-8.4 lts-12.15
-compiler: ghc-8.6 nightly-2018-10-21
+compiler: ghc-8.4 lts-12.26
+compiler: ghc-8.6 lts-13.3
 
 # options
 # option: alias x=y z=v
diff --git a/.travis.yml b/.travis.yml
index e542406..eb4f365 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
-# ~*~ auto-generated by haskell-ci with config : c5de1915986b17c62e2a4cbe1fb7b3d47a6b1dc45a8f4d4fa78654695dfd1f43 ~*~
+# ~*~ auto-generated by haskell-ci with config : 8f74deffc95fd794fa2996c167c6543bbfab1ae432f0a83e0898f0b5871a92eb ~*~
 
 # Use new container infrastructure to enable caching
 sudo: false
@@ -61,11 +61,11 @@ script:
         stack --no-terminal build --install-ghc --coverage --test --bench --no-run-benchmarks --haddock --no-haddock-deps
         ;;
       ghc-8.4)
-        echo "{ resolver: lts-12.15, packages: [ '.' ], extra-deps: [], flags: {} }" > stack.yaml
+        echo "{ resolver: lts-12.26, packages: [ '.' ], extra-deps: [], flags: {} }" > stack.yaml
         stack --no-terminal build --install-ghc --coverage --test --bench --no-run-benchmarks --haddock --no-haddock-deps
         ;;
       ghc-8.6)
-        echo "{ resolver: nightly-2018-10-21, packages: [ '.' ], extra-deps: [], flags: {} }" > stack.yaml
+        echo "{ resolver: lts-13.3, packages: [ '.' ], extra-deps: [], flags: {} }" > stack.yaml
         stack --no-terminal build --install-ghc --coverage --test --bench --no-run-benchmarks --haddock --no-haddock-deps
         ;;
       esac
diff --git a/stack.yaml b/stack.yaml
index bd5b3a6..946d1a4 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,3 +1,3 @@
-# ~*~ auto-generated by haskell-ci with config : c5de1915986b17c62e2a4cbe1fb7b3d47a6b1dc45a8f4d4fa78654695dfd1f43 ~*~
-{ resolver: lts-12.15, packages: [ '.' ], extra-deps: [], flags: {} }
+# ~*~ auto-generated by haskell-ci with config : 8f74deffc95fd794fa2996c167c6543bbfab1ae432f0a83e0898f0b5871a92eb ~*~
+{ resolver: lts-12.26, packages: [ '.' ], extra-deps: [], flags: {} }