diff --git a/.github/workflows/CI.yaml b/.github/workflows/CI.yaml
index a483e2e..05beea8 100644
--- a/.github/workflows/CI.yaml
+++ b/.github/workflows/CI.yaml
@@ -10,7 +10,7 @@ jobs:
       matrix:
         rust:
           - stable
-          - 1.65
+          - 1.78
 
     services:
       postgres:
diff --git a/Cargo.toml b/Cargo.toml
index e2f4a42..2681e5d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "diesel-derive-enum"
-version = "2.1.0"
+version = "2.2.4-rc.0"
 description = "Derive diesel boilerplate for using enums in databases"
 authors = ["Alex Whitney <adwhit@fastmail.com>"]
 repository = "http://github.com/adwhit/diesel-derive-enum"
diff --git a/README.md b/README.md
index 08bce4d..ae1a944 100644
--- a/README.md
+++ b/README.md
@@ -28,10 +28,10 @@ Unfortunately, it won't work out of the box, because any type which
 we wish to use with Diesel must implement various traits.
 Tedious to do by hand, easy to do with a `derive` macro - enter `diesel-derive-enum`.
 
-The latest release, `2.1.0`, is tested against `diesel 2.1.0` and `rustc 1.65` (we try to keep in lock-step with `diesel`).
-For earlier versions of `diesel`, check out the `2.0.1` and  `1.*` releases of this crate.
+The latest release, `2.X.X`, is tested against `diesel 2.2.4` and `rustc 1.78` (we try to keep in lock-step with `diesel`).
+For earlier versions of `diesel`, check out the `2.1.0` and earlier releases of this crate.
 
-## Upgrading from `2.0.x` -> `2.1.0`
+## Upgrading from `2.0.x`
 
 Using `diesel-cli`? Due to an upstream change, you may need to modify your existing `diesel.toml` file.
 As of version `2.1.0`, it **must** contain the following lines:
diff --git a/tests/Cargo.lock b/tests/Cargo.lock
index b0f385e..f1ca865 100644
--- a/tests/Cargo.lock
+++ b/tests/Cargo.lock
@@ -78,7 +78,7 @@ dependencies = [
 
 [[package]]
 name = "diesel-derive-enum"
-version = "2.1.0"
+version = "2.2.4-rc.0"
 dependencies = [
  "heck",
  "proc-macro2",