diff --git a/src/App.hs b/src/App.hs
index 636ea04..26603b1 100644
--- a/src/App.hs
+++ b/src/App.hs
@@ -1,6 +1,7 @@
 module App where
 
 import           Control.Applicative   (optional)
+import           Control.Monad
 import           Control.Monad.Except
 import           Control.Monad.Reader
 import           Control.Monad.State
diff --git a/src/Import.hs b/src/Import.hs
index 96fd06e..a6fcc4f 100644
--- a/src/Import.hs
+++ b/src/Import.hs
@@ -4,6 +4,7 @@ module Import where
 import           Control.Lens          ((&))
 import           Control.Monad
 import           Control.Monad.Except
+import           Control.Monad.IO.Class
 
 import           Data.Aeson
 import qualified Data.ByteString       as B
diff --git a/src/Types/Content.hs b/src/Types/Content.hs
index 48ae460..578d1ce 100644
--- a/src/Types/Content.hs
+++ b/src/Types/Content.hs
@@ -4,6 +4,7 @@ Types for the blog content - articles and metas.
 module Types.Content where
 
 import           Control.Applicative
+import           Control.Monad
 import           Control.Monad.State
 import           Control.Monad.Trans.Except
 import qualified Control.Monad.Trans.State.Strict as StrictState
diff --git a/stack.yaml b/stack.yaml
index 809ce2b..7ca16e3 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,6 +1,8 @@
-resolver: lts-21.3
+resolver: lts-22.13
 packages:
 - '.'
+extra-deps:
+- feed-1.3.2.1@sha256:be3e09df396a205edfaffd6f60f2e8ff6531e360e0f6f56a25f3f662e76413c6,4721
 flags:
   pandoc:
     embed_data_files: true
diff --git a/stack.yaml.lock b/stack.yaml.lock
index f587b6e..9f4036e 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -3,10 +3,17 @@
 # For more information, please see the documentation at:
 #   https://docs.haskellstack.org/en/stable/lock_files
 
-packages: []
+packages:
+- completed:
+    hackage: feed-1.3.2.1@sha256:be3e09df396a205edfaffd6f60f2e8ff6531e360e0f6f56a25f3f662e76413c6,4721
+    pantry-tree:
+      sha256: a4523c5832bba7170ef14c8c3653ff5e4ea9f382bf8b043faf3b3ae735b0ac83
+      size: 2906
+  original:
+    hackage: feed-1.3.2.1@sha256:be3e09df396a205edfaffd6f60f2e8ff6531e360e0f6f56a25f3f662e76413c6,4721
 snapshots:
 - completed:
-    sha256: 97710f56bf093fca0ee5d8dbe19d96b654c752e405b66795b4baedd84a794c60
-    size: 640010
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/21/3.yaml
-  original: lts-21.3
+    sha256: 6f0bea3ba5b07360f25bc886e8cff8d847767557a492a6f7f6dcb06e3cc79ee9
+    size: 712905
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/13.yaml
+  original: lts-22.13