+# Packages
+
+Stack is using the [9.14-lts resolver](https://www.stackage.org/lts-9.14) for packages, so make sure you read the [correct documentation for the packages included in it](https://www.stackage.org/lts-9.14/docs).
+
+When you use a new package, use
+
+```
+stack solver
+```
+to see how the `stack.yaml` file needs to change, and
+```
+stack solver --update-yaml
+```
+to implement the changes.
+