diff --git a/CHANGES.md b/CHANGES.md
index 49c63064..873b4530 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,6 @@
 # Change log
 
-## 0.7
+## 0.6
 
 * #276: Add `Monoid` and `Semigroup` instances.
 * #278: Stop supporting GHC 8.0 and GHC 8.2.
@@ -8,9 +8,6 @@
               `Undirected` component in `Bipartite.Undirected.AdjacencyMap`.
 * #273: Add attribute quoting style to `Export.Dot`.
 * #259: Allow newer QuickCheck.
-
-## 0.6
-
 * #257: Add `IsString` instances.
 * #226: Expand the API of `Bipartite.Undirected.AdjacencyMap`.
 
diff --git a/algebraic-graphs.cabal b/algebraic-graphs.cabal
index 5d47276b..c3606625 100644
--- a/algebraic-graphs.cabal
+++ b/algebraic-graphs.cabal
@@ -1,6 +1,6 @@
 cabal-version: 2.2
 name:          algebraic-graphs
-version:       0.7
+version:       0.6
 synopsis:      A library for algebraic graph construction and transformation
 license:       MIT
 license-file:  LICENSE
diff --git a/hie.yaml b/hie.yaml
deleted file mode 100644
index 77b7d049..00000000
--- a/hie.yaml
+++ /dev/null
@@ -1 +0,0 @@
-cradle: {stack: {component: "algebraic-graphs:lib"}}
diff --git a/stack.yaml b/stack.yaml
index 9bbcc7dd..39954fd5 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1 +1,9 @@
-resolver: lts-18.0
+resolver: ghc-8.10.7
+
+extra-deps:
+  - QuickCheck-2.14.2@sha256:4ce29211223d5e6620ebceba34a3ca9ccf1c10c0cf387d48aea45599222ee5aa,7736
+  - random-1.2.1@sha256:8bee24dc0c985a90ee78d94c61f8aed21c49633686f0f1c14c5078d818ee43a2,6598
+  - splitmix-0.1.0.4@sha256:714a55fd28d3e2533bd5b49e74f604ef8e5d7b06f249c8816f6c54aed431dcf1,6483
+  - extra-1.7.10@sha256:e384751317577554f873812358fab022da02aa9a286c9341308fac83f4d766c5,2691
+  - inspection-testing-0.4.6.0@sha256:84f90538811e11bf7b5f8b54f1d63223edfa95bfb4ec39025b4df0ae2616a81f,8071
+  - clock-0.8.2@sha256:473ffd59765cc67634bdc55b63c699a85addf3a024089073ec2a862881e83e2a,4313