diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index af201d0..8ce1339 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        resolver: [nightly]
+        resolver: [lts-16, lts-15, lts-14, lts-12]
 
     steps:
       - name: Clone project
diff --git a/stack.yaml b/stack.yaml
index 8faa899..0c2108c 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,19 +1,10 @@
-resolver: nightly-2021-01-05
-
-flags:
-  xmonad:
-    generatemanpage: true
+resolver: lts-16.22
 
 packages:
 - ./
 
 extra-deps:
 - X11-1.9.2
-- pandoc-2.11.3.2
-- citeproc-0.3.0.3
-- commonmark-0.1.1.2
-- commonmark-extensions-0.2.0.4
-- commonmark-pandoc-0.2.0.1
 
 nix:
   packages: