diff --git a/.travis.yml b/.travis.yml
index f115e505..e34d02cc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 language: rust
 cache: cargo
 rust:
+  - 1.21.0
   - stable
   - beta
   - nightly
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a9c3902..26413208 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# v0.2.10 (2018-06-07)
+
+* 1.21.0 is the minimum required rustc version by
+  [@TeXitoi](https://github.com/TeXitoi)
+
 # v0.2.9 (2018-06-05)
 
 * Fix a bug when using `flatten` by
diff --git a/Cargo.toml b/Cargo.toml
index 7cc6355c..91bdbb68 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "structopt"
-version = "0.2.9"
+version = "0.2.10"
 authors = ["Guillaume Pinot <texitoi@texitoi.eu>", "others"]
 description = "Parse command line argument by defining a struct."
 documentation = "https://docs.rs/structopt"
@@ -27,6 +27,6 @@ travis-ci = { repository = "TeXitoi/structopt" }
 
 [dependencies]
 clap = { version = "2.20", default-features = false }
-structopt-derive = { path = "structopt-derive", version = "0.2.9" }
+structopt-derive = { path = "structopt-derive", version = "0.2.10" }
 
 [workspace]
diff --git a/README.md b/README.md
index 7e038f51..7b4fb36b 100644
--- a/README.md
+++ b/README.md
@@ -102,6 +102,12 @@ $ ./basic -o foo.txt -dvvvs 1337 -l alice -l bob --nb-cars 4 bar.txt baz.txt
 Opt { debug: true, verbose: 3, speed: 1337, output: "foo.txt", nb_cars: Some(4), level: ["alice", "bob"], files: ["bar.txt", "baz.txt"] }
 ```
 
+## StructOpt rustc version policy
+
+- Minimum rustc version modification must be specified in the [changelog](https://github.com/TeXitoi/structopt/blob/master/CHANGELOG.md) and in the [travis configuration](https://github.com/TeXitoi/structopt/blob/master/.travis.yml).
+- Contributors can increment minimum rustc version without any justification if the new version is required by the latest version of one of StructOpt's depedencies (`cargo update` will not fail on StructOpt).
+- Contributors can increment minimum rustc version if the library user experience is improved.
+
 ## Why
 
 I use [docopt](https://crates.io/crates/docopt) since a long time (pre rust 1.0). I really like the fact that you have a structure with the parsed argument: no need to convert `String` to `f64`, no useless `unwrap`. But on the other hand, I don't like to write by hand the usage string. That's like going back to the golden age of WYSIWYG editors.  Field naming is also a bit artificial.
diff --git a/structopt-derive/Cargo.toml b/structopt-derive/Cargo.toml
index dc641ca2..5d294122 100644
--- a/structopt-derive/Cargo.toml
+++ b/structopt-derive/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "structopt-derive"
-version = "0.2.9"
+version = "0.2.10"
 authors = ["Guillaume Pinot <texitoi@texitoi.eu>"]
 description = "Parse command line argument by defining a struct, derive crate."
 documentation = "https://docs.rs/structopt-derive"
diff --git a/structopt-derive/src/attrs.rs b/structopt-derive/src/attrs.rs
index 4089b44d..aed307af 100644
--- a/structopt-derive/src/attrs.rs
+++ b/structopt-derive/src/attrs.rs
@@ -108,7 +108,7 @@ impl Attrs {
                 ref tokens => panic!("unsupported syntax: {}", quote!(#tokens).to_string()),
             });
         for attr in iter {
-            match &attr {
+            match attr {
                 NameValue(MetaNameValue {
                     ident,
                     lit: Str(value),
@@ -118,14 +118,21 @@ impl Attrs {
                     name: ident.to_string(),
                     args: quote!(#lit),
                 }),
-                List(MetaList { ident, nested, .. }) if ident == "parse" => {
+                List(MetaList {
+                    ref ident,
+                    ref nested,
+                    ..
+                }) if ident == "parse" =>
+                {
                     if nested.len() != 1 {
                         panic!("parse must have exactly one argument");
                     }
                     self.has_custom_parser = true;
-                    self.parser = match &nested[0] {
+                    self.parser = match nested[0] {
                         Meta(NameValue(MetaNameValue {
-                            ident, lit: Str(v), ..
+                            ref ident,
+                            lit: Str(ref v),
+                            ..
                         })) => {
                             let function: syn::Path = v.parse().expect("parser function path");
                             let parser = ident.to_string().parse().unwrap();
@@ -149,13 +156,17 @@ impl Attrs {
                     };
                 }
                 List(MetaList {
-                    ident, ref nested, ..
+                    ref ident,
+                    ref nested,
+                    ..
                 }) if ident == "raw" =>
                 {
                     for method in nested {
-                        match method {
+                        match *method {
                             Meta(NameValue(MetaNameValue {
-                                ident, lit: Str(v), ..
+                                ref ident,
+                                lit: Str(ref v),
+                                ..
                             })) => self.push_raw_method(&ident.to_string(), v),
                             ref mi @ _ => panic!("unsupported raw entry: {}", quote!(#mi)),
                         }
diff --git a/tests/arguments.rs b/tests/arguments.rs
index 5c3bc432..47b57f4c 100644
--- a/tests/arguments.rs
+++ b/tests/arguments.rs
@@ -106,6 +106,6 @@ fn arguments_safe() {
 
     assert_eq!(
         clap::ErrorKind::ValueValidation,
-        Opt::from_iter_safe(&["test", "NOPE"]).err().unwrap().kind,
+        Opt::from_iter_safe(&["test", "NOPE"]).err().unwrap().kind
     );
 }
diff --git a/tests/custom-string-parsers.rs b/tests/custom-string-parsers.rs
index 92e1dd8a..738f3e21 100644
--- a/tests/custom-string-parsers.rs
+++ b/tests/custom-string-parsers.rs
@@ -231,7 +231,7 @@ fn test_custom_bool() {
             tribool: None,
             bitset: vec![],
         },
-        Opt::from_iter(&["test", "-dfalse"]),
+        Opt::from_iter(&["test", "-dfalse"])
     );
     assert_eq!(
         Opt {
@@ -240,7 +240,7 @@ fn test_custom_bool() {
             tribool: None,
             bitset: vec![],
         },
-        Opt::from_iter(&["test", "-dtrue"]),
+        Opt::from_iter(&["test", "-dtrue"])
     );
     assert_eq!(
         Opt {
@@ -249,7 +249,7 @@ fn test_custom_bool() {
             tribool: None,
             bitset: vec![],
         },
-        Opt::from_iter(&["test", "-dtrue", "-vfalse"]),
+        Opt::from_iter(&["test", "-dtrue", "-vfalse"])
     );
     assert_eq!(
         Opt {
@@ -258,7 +258,7 @@ fn test_custom_bool() {
             tribool: None,
             bitset: vec![],
         },
-        Opt::from_iter(&["test", "-dtrue", "-vtrue"]),
+        Opt::from_iter(&["test", "-dtrue", "-vtrue"])
     );
     assert_eq!(
         Opt {
@@ -267,7 +267,7 @@ fn test_custom_bool() {
             tribool: Some(false),
             bitset: vec![],
         },
-        Opt::from_iter(&["test", "-dtrue", "-tfalse"]),
+        Opt::from_iter(&["test", "-dtrue", "-tfalse"])
     );
     assert_eq!(
         Opt {
@@ -276,7 +276,7 @@ fn test_custom_bool() {
             tribool: Some(true),
             bitset: vec![],
         },
-        Opt::from_iter(&["test", "-dtrue", "-ttrue"]),
+        Opt::from_iter(&["test", "-dtrue", "-ttrue"])
     );
     assert_eq!(
         Opt {
@@ -285,6 +285,6 @@ fn test_custom_bool() {
             tribool: None,
             bitset: vec![false, true, false, false],
         },
-        Opt::from_iter(&["test", "-dtrue", "-bfalse", "-btrue", "-bfalse", "-bfalse"]),
+        Opt::from_iter(&["test", "-dtrue", "-bfalse", "-btrue", "-bfalse", "-bfalse"])
     );
 }