diff --git a/README.md b/README.md
index 0c9a6e01..d5668520 100644
--- a/README.md
+++ b/README.md
@@ -30,12 +30,12 @@ or the [full tutorial][dhall-tutorial].
 
 ## Prerequisites
 
-**NOTE**: `dhall-kubernetes` requires at least version `1.20.1` of [the interpreter](https://github.com/dhall-lang/dhall-haskell)
-(version `5.0.0` of the language).
+**NOTE**: `dhall-kubernetes` requires at least version `1.21.0` of [the interpreter](https://github.com/dhall-lang/dhall-haskell)
+(version `6.0.0` of the language).
 
 You can install the latest version with the following:
 ```bash
-stack install dhall-1.20.1 dhall-json-1.2.6 --resolver=nightly-2019-01-17
+stack install dhall-1.21.0 dhall-json-1.2.7 --resolver=nightly-2019-04-16
 ```
 
 ## Quickstart - main API