Update MSRV and criterion

.circleci/config.yml

@@ -14,7 +14,7 @@ workflows:
                 # be easier on the CI hosts since presumably those fat lower layers will already be cached, and
                 # therefore faster than a minimal, customized alpine.
                 # MSRV
-                'rust:1.51.0'
+                'rust:1.57.0'
               ]
               # a hacky scheme to work around CircleCI's inability to deal with mutable docker tags, forcing us to
               # get a nightly or stable toolchain via rustup instead of a mutable docker tag

Cargo.toml

@@ -10,15 +10,16 @@ keywords = ["base64", "utf8", "encode", "decode", "no_std"]
 categories = ["encoding"]
 license = "MIT OR Apache-2.0"
 edition = "2018"
-rust-version = "1.51.0"
+rust-version = "1.57.0"
 
 [[bench]]
 name = "benchmarks"
 harness = false
 
 [dev-dependencies]
-criterion = "0.3.5"
+criterion = "0.4.0"
 rand = { version = "0.8.5", features = ["small_rng"] }
+# clap 4 would require 1.60
 structopt = "0.3.26"
 # test fixtures for engine tests
 rstest = "0.12.0"

README.md

@@ -45,7 +45,7 @@ If you have a `Read` (e.g. reading a file or network socket), there are various
 
 ## Rust version compatibility
 
-The minimum required Rust version is 1.51.0.
+The minimum required Rust version is 1.57.0.
 
 # Contributing
 

RELEASE-NOTES.md

@@ -2,7 +2,7 @@
 
 ## Next
 
-- MSRV is now 1.51.0 to keep up with `criterion`
+- Update MSRV to 1.57.0
 
 ## 0.20.0-alpha.1
 

clippy.toml

@@ -1 +1 @@
-msrv = "1.51.0"
+msrv = "1.57.0"