diff --git a/README.md b/README.md
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@@ -85,7 +85,7 @@ around comments in expanded mode or error messages.
 
 ## Versioning
 
-The minimum supported rust version (MSRV) of `grass` is `1.64.0`. An increase to the MSRV will correspond with a minor version bump. The current MSRV is not a hard minimum, but future bugfix
+The minimum supported rust version (MSRV) of `grass` is `1.70.0`. An increase to the MSRV will correspond with a minor version bump. The current MSRV is not a hard minimum, but future bugfix
 versions of `grass` are not guaranteed to work on versions prior to this.
 
 `grass` currently targets `dart-sass` version `1.54.3`. An increase to this number will correspond to either a minor or bugfix version bump, depending on the changes.