diff --git a/stack-8.6.3.yaml b/stack-8.6.3.yaml
index 2244fa9c8..23b767b72 100644
--- a/stack-8.6.3.yaml
+++ b/stack-8.6.3.yaml
@@ -1,4 +1,4 @@
-resolver: lts-13.9
+resolver: lts-13.11 # Last GHC 8.6.3
 packages:
 - .
 - hie-plugin-api
diff --git a/stack-8.6.4.yaml b/stack-8.6.4.yaml
index 5fe117c40..fcb39fae4 100644
--- a/stack-8.6.4.yaml
+++ b/stack-8.6.4.yaml
@@ -1,4 +1,4 @@
-resolver: nightly-2019-03-07 # GHC 8.6.4
+resolver: lts-13.12 # GHC 8.6.4
 packages:
 - .
 - hie-plugin-api
@@ -11,14 +11,14 @@ extra-deps:
 - ./submodules/ghc-mod/core
 - ./submodules/floskell
 
-- ansi-terminal-0.8.2
 - butcher-1.3.2.1
 - cabal-plan-0.4.0.0
 - constrained-dynamic-0.1.0.0
-- deque-0.2.7
-- ghc-exactprint-0.5.8.2
 - haddock-api-2.22.0
+- haskell-src-exts-1.21.0
+- hlint-2.1.15
 - hsimport-0.8.8
+- hoogle-5.0.17.5
 - monad-dijkstra-0.1.1.2@rev:1
 - monad-memo-0.4.1
 - multistate-0.8.0.1
diff --git a/stack.yaml b/stack.yaml
index 5fe117c40..32eef986a 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -18,6 +18,7 @@ extra-deps:
 - deque-0.2.7
 - ghc-exactprint-0.5.8.2
 - haddock-api-2.22.0
+- hlint-2.1.15
 - hsimport-0.8.8
 - monad-dijkstra-0.1.1.2@rev:1
 - monad-memo-0.4.1