diff --git a/README.md b/README.md
index cd48fdb6..2cdfbf0b 100644
--- a/README.md
+++ b/README.md
@@ -27,13 +27,13 @@ repository and compiled from source or installed from
 of the nightly toolchain is supported at any given time.
 
 <!-- NOTE: Keep in sync with nightly date on rust-toolchain. -->
-It's recommended to use `nightly-2022-05-16` toolchain.
-You can install it by using `rustup install nightly-2022-05-16` if you already have rustup.
+It's recommended to use `nightly-2022-05-23` toolchain.
+You can install it by using `rustup install nightly-2022-05-23` if you already have rustup.
 Then you can do:
 
 ```sh
-$ rustup component add rustc-dev llvm-tools-preview --toolchain nightly-2022-05-16
-$ cargo +nightly-2022-05-16 install --git https://github.com/rust-lang/rust-semverver
+$ rustup component add rustc-dev llvm-tools-preview --toolchain nightly-2022-05-23
+$ cargo +nightly-2022-05-23 install --git https://github.com/rust-lang/rust-semverver
 ```
 
 You'd also need `cmake` for some dependencies, and a few common libraries (if you hit
@@ -122,7 +122,7 @@ carried out correctly with regards to the current version of your crate on crate
 
 ```sh
 # install a current version of rust-semverver
-cargo +nightly-2022-05-16 install --git https://github.com/rust-lang/rust-semverver
+cargo +nightly-2022-05-23 install --git https://github.com/rust-lang/rust-semverver
 # fetch the version in the manifest of your crate (adapt this to your usecase if needed)
 eval "current_version=$(grep -e '^version = .*$' Cargo.toml | cut -d ' ' -f 3)"
 # run the semver checks and output them for convenience
diff --git a/rust-toolchain b/rust-toolchain
index 079bb92a..d7428ce9 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1,4 +1,4 @@
 # NOTE: Keep in sync with nightly date on README
 [toolchain]
-channel = "nightly-2022-05-16"
+channel = "nightly-2022-05-23"
 components = ["llvm-tools-preview", "rustc-dev"]
diff --git a/tests/cases/regions/stdout b/tests/cases/regions/stdout
index 2c853267..58c6eb49 100644
--- a/tests/cases/regions/stdout
+++ b/tests/cases/regions/stdout
@@ -37,7 +37,7 @@ error: breaking changes in `efg`
 17 | pub fn efg(_: &str) { }
    | ^^^^^^^^^^^^^^^^^^^
    |
-   = warning: type error: expected bound lifetime parameter, found concrete lifetime (breaking)
+   = warning: type error: one type is more general than the other (breaking)
 
 error: breaking changes in `fgh`
   --> regions/new.rs:19:1
@@ -45,6 +45,6 @@ error: breaking changes in `fgh`
 19 | pub fn fgh(_: &'static str) { }
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: type error: expected bound lifetime parameter, found concrete lifetime (breaking)
+   = warning: type error: one type is more general than the other (breaking)
 
-error: aborting due to 6 previous errors
\ No newline at end of file
+error: aborting due to 6 previous errors