diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5e53ab4..29cc1f7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,10 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.5.0] 2023-12-30
 ### Changed
 - Adopt anyhow and thiserror instead of failure
 - Start a modularization work to build a pot crate
+- Make DNS configuration optional (#51)
 
 ## [0.4.4] 2020-03-31
 ### Fixed
diff --git a/Cargo.lock b/Cargo.lock
index e95a2ac..4773882 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -28,9 +28,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.75"
+version = "1.0.77"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4668cab20f66d8d020e1fbc0ebe47217433c1b6c8f2040faf858554e394ace6"
+checksum = "c9d19de80eff169429ac1e9f48fffb163916b448a44e8e046186232046d9e1f9"
 
 [[package]]
 name = "atty"
@@ -84,9 +84,9 @@ dependencies = [
 
 [[package]]
 name = "cargo-platform"
-version = "0.1.5"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e34637b3140142bdf929fb439e8aa4ebad7651ebf7b1080b3930aa16ac1459ff"
+checksum = "ceed8ef69d8518a5dda55c07425450b58a4e1946f4951eab6d7191ee86c2443d"
 dependencies = [
  "serde",
 ]
@@ -194,7 +194,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a258e46cdc063eb8519c00b9fc845fc47bcfca4130e2f08e88665ceda8474245"
 dependencies = [
  "libc",
- "windows-sys 0.52.0",
+ "windows-sys",
 ]
 
 [[package]]
@@ -249,9 +249,9 @@ dependencies = [
 
 [[package]]
 name = "iana-time-zone"
-version = "0.1.58"
+version = "0.1.59"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8326b86b6cff230b97d0d312a6c40a60726df3332e721f72a1b035f451663b20"
+checksum = "b6a67363e2aa4443928ce15e57ebae94fd8949958fd1223c4cfc0cd473ad7539"
 dependencies = [
  "android_system_properties",
  "core-foundation-sys",
@@ -337,9 +337,9 @@ checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
 [[package]]
 name = "memchr"
-version = "2.6.4"
+version = "2.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f665ee40bc4a3c5590afb1e9677db74a508659dfd71e126420da8274909a0167"
+checksum = "523dc4f511e55ab87b694dc30d0f820d60906ef06413f93d4d7a1385599cc149"
 
 [[package]]
 name = "mocktopus"
@@ -387,7 +387,7 @@ dependencies = [
 
 [[package]]
 name = "potnet"
-version = "0.4.4"
+version = "0.5.0"
 dependencies = [
  "anyhow",
  "ipnet",
@@ -427,9 +427,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.70"
+version = "1.0.71"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39278fbbf5fb4f646ce651690877f89d1c5811a3d4acb27700c1cb3cdb78fd3b"
+checksum = "75cb1540fadbd5b8fbccc4dddad2734eba435053f725621c070711a14bb5f4b8"
 dependencies = [
  "unicode-ident",
 ]
@@ -484,7 +484,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.52.0",
+ "windows-sys",
 ]
 
 [[package]]
@@ -528,7 +528,7 @@ checksum = "43576ca501357b9b071ac53cdc7da8ef0cbd9493d8df094cd821777ea6e894d3"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.41",
+ "syn 2.0.43",
 ]
 
 [[package]]
@@ -623,9 +623,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.41"
+version = "2.0.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44c8b28c477cc3bf0e7966561e3460130e1255f7a1cf71931075f1c5e7a7e269"
+checksum = "ee659fb5f3d355364e1f3e5bc10fb82068efbf824a1e9d1c9504244a6469ad53"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -634,15 +634,15 @@ dependencies = [
 
 [[package]]
 name = "tempfile"
-version = "3.8.1"
+version = "3.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ef1adac450ad7f4b3c28589471ade84f25f731a7a0fe30d71dfa9f60fd808e5"
+checksum = "01ce4141aa927a6d1bd34a041795abd0db1cccba5d5f24b009f694bdf3a1f3fa"
 dependencies = [
  "cfg-if 1.0.0",
  "fastrand",
  "redox_syscall",
  "rustix",
- "windows-sys 0.48.0",
+ "windows-sys",
 ]
 
 [[package]]
@@ -681,7 +681,7 @@ checksum = "e7fbe9b594d6568a6a1443250a7e67d80b74e1e96f6d1715e1e21cc1888291d3"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.41",
+ "syn 2.0.43",
 ]
 
 [[package]]
@@ -760,7 +760,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.41",
+ "syn 2.0.43",
  "wasm-bindgen-shared",
 ]
 
@@ -782,7 +782,7 @@ checksum = "f0eb82fcb7930ae6219a7ecfd55b217f5f0893484b7a13022ebb2b2bf20b5283"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.41",
+ "syn 2.0.43",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -826,20 +826,11 @@ checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
 [[package]]
 name = "windows-core"
-version = "0.51.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1f8cf84f35d2db49a46868f947758c7a1138116f7fac3bc844f43ade1292e64"
-dependencies = [
- "windows-targets 0.48.5",
-]
-
-[[package]]
-name = "windows-sys"
-version = "0.48.0"
+version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
+checksum = "33ab640c8d7e35bf8ba19b884ba838ceb4fba93a4e8c65a9059d08afcfc683d9"
 dependencies = [
- "windows-targets 0.48.5",
+ "windows-targets 0.52.0",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index b8d3d26..1a1ce1f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,8 +1,8 @@
 [package]
 name = "potnet"
-version = "0.4.4"
+version = "0.5.0"
 authors = ["Luca Pizzamiglio <pizzamig@FreeBSD.org>"]
-edition = "2018"
+edition = "2021"
 categories = ["command-line-interface"]
 keywords = ["FreeBSD"]
 repository = "https://github.com/pizzamig/potnet"
diff --git a/pot/Cargo.toml b/pot/Cargo.toml
index 5380df3..182b587 100644
--- a/pot/Cargo.toml
+++ b/pot/Cargo.toml
@@ -2,7 +2,7 @@
 name = "pot-rs"
 version = "0.5.0"
 authors = ["Luca Pizzamiglio <pizzamig@FreeBSD.org>"]
-edition = "2018"
+edition = "2021"
 keywords = ["FreeBSD"]
 description = "Utility modules and functions useful to interact with the pot framework"
 readme = "README.md"
diff --git a/pot/src/system.rs b/pot/src/system.rs
index 3086dc4..22cda9a 100644
--- a/pot/src/system.rs
+++ b/pot/src/system.rs
@@ -32,7 +32,7 @@ impl PartialSystemConf {
             Err(_) => return dconf,
         };
         let pconf = PartialSystemConf::from_str(&s).ok().unwrap_or_default();
-        let pconf_has_dns_ip = pconf.dns_ip != None;
+        let pconf_has_dns_ip = pconf.dns_ip.is_some();
         dconf.merge(pconf);
         // remove dns_ip if it came from default config and is not inside pot network
         if !pconf_has_dns_ip {
@@ -234,7 +234,7 @@ mod tests {
         assert!(uut.is_ok());
         let uut = uut.unwrap();
         assert!(!uut.is_valid());
-        assert!(!uut.network.is_some());
+        assert!(uut.network.is_none());
     }
 
     #[test]
diff --git a/src/bin/potcpu.rs b/src/bin/potcpu.rs
index c4778a6..d2c3b7f 100644
--- a/src/bin/potcpu.rs
+++ b/src/bin/potcpu.rs
@@ -56,9 +56,7 @@ fn allocation_from_utf8(v: &[u8]) -> Result<Allocation> {
     let result: Allocation = mask
         .split(',')
         .map(str::trim)
-        .map(str::parse)
-        .filter(std::result::Result::is_ok)
-        .map(std::result::Result::unwrap)
+        .flat_map(str::parse)
         .collect();
     Ok(result)
 }