diff --git a/Cargo.toml b/Cargo.toml
index 6a30c75..bb830f6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "nethsm-sdk-rs"
-version = "0.1.0"
+version = "0.3.0"
 authors = ["Nitrokey <info@nitrokey.com>"]
 description = "All endpoints expect exactly the specified JSON. Additional properties will cause a Bad Request Error (400). All HTTP errors contain a JSON structure with an explanation of type string. All [base64](https://tools.ietf.org/html/rfc4648#section-4) encoded values are Big Endian. "
 license = "MIT"
@@ -15,9 +15,9 @@ exclude = [
 ]
 
 [dependencies]
-serde = "^1.0"
+serde = { default-features = false, version = "^1.0" }
 serde_derive = "^1.0"
-serde_json = "^1.0"
+serde_json = { default-features = false, version = "^1.0" }
 url = "^2.2"
-ureq = { version = "2", features = ["json"] }
-base64ct = { version = "1.6", features = ["alloc"] }
+ureq = { version = "2", features = ["json", "tls"], default-features = false }
+base64 = { version = "0.21", default-features = false }
diff --git a/docs/SystemInfo.md b/docs/SystemInfo.md
index 3d831ed..8b3dc39 100644
--- a/docs/SystemInfo.md
+++ b/docs/SystemInfo.md
@@ -7,7 +7,7 @@ Name | Type | Description | Notes
 **firmware_version** | **String** |  | 
 **software_version** | **String** |  | 
 **hardware_version** | **String** |  | 
-**build_tag** | **String** |  | 
+**software_build** | Option<**String**> |  | [optional]
 **device_id** | **String** |  | 
 **pcr** | [**serde_json::Value**](.md) |  | 
 **ak_pub** | [**serde_json::Value**](.md) |  | 
diff --git a/generator/src/main/resources/crust/Cargo.mustache b/generator/src/main/resources/crust/Cargo.mustache
index f1b7095..1761afc 100644
--- a/generator/src/main/resources/crust/Cargo.mustache
+++ b/generator/src/main/resources/crust/Cargo.mustache
@@ -32,12 +32,12 @@ homepage = "{{.}}
 {{/homePageUrl}}
 
 [dependencies]
-serde = "^1.0"
-serde_derive = "^1.0"
 {{#serdeWith}}
 serde_with = "^2.0"
 {{/serdeWith}}
-serde_json = "^1.0"
+serde = { default-features = false, version = "^1.0" }
+serde_derive = "^1.0"
+serde_json = { default-features = false, version = "^1.0" }
 url = "^2.2"
-ureq = { version = "2", features = ["json"] }
-base64ct = { version = "1.6", features = ["alloc"] }
+ureq = { version = "2", features = ["json", "tls"], default-features = false }
+base64 = { version = "0.21", default-features = false }
diff --git a/generator/src/main/resources/crust/reqwest/api_mod.mustache b/generator/src/main/resources/crust/reqwest/api_mod.mustache
index 154ecdf..4e3b562 100644
--- a/generator/src/main/resources/crust/reqwest/api_mod.mustache
+++ b/generator/src/main/resources/crust/reqwest/api_mod.mustache
@@ -1,8 +1,7 @@
 use std::error;
 use std::fmt;
 use std::collections::HashMap;
-
-use base64ct::{Base64, Encoding};
+use base64::{engine::general_purpose, Engine};
 
 pub (crate) fn get_header_map(response : &ureq::Response) -> HashMap<String,String> {
 
@@ -111,7 +110,7 @@ pub fn parse_deep_object(prefix: &str, value: &serde_json::Value) -> Vec<(String
 
 pub(crate) fn basic_auth(auth: &configuration::BasicAuth) -> String {
     let string = format!("{}:{}", auth.0, auth.1.as_ref().unwrap_or(&"".to_string()));
-    format!("Basic {}", Base64::encode_string(string.as_bytes()))
+    format!("Basic {}", general_purpose::STANDARD.encode(string)).to_string()
 }
 
 {{#apiInfo}}
diff --git a/src/apis/mod.rs b/src/apis/mod.rs
index 0fc5df9..a203487 100644
--- a/src/apis/mod.rs
+++ b/src/apis/mod.rs
@@ -1,9 +1,8 @@
+use base64::{engine::general_purpose, Engine};
 use std::collections::HashMap;
 use std::error;
 use std::fmt;
 
-use base64ct::{Base64, Encoding};
-
 pub(crate) fn get_header_map(response: &ureq::Response) -> HashMap<String, String> {
     let mut headers = HashMap::new();
 
@@ -111,7 +110,7 @@ pub fn parse_deep_object(prefix: &str, value: &serde_json::Value) -> Vec<(String
 
 pub(crate) fn basic_auth(auth: &configuration::BasicAuth) -> String {
     let string = format!("{}:{}", auth.0, auth.1.as_ref().unwrap_or(&"".to_string()));
-    format!("Basic {}", Base64::encode_string(string.as_bytes()))
+    format!("Basic {}", general_purpose::STANDARD.encode(string)).to_string()
 }
 
 pub mod default_api;
diff --git a/src/models/system_info.rs b/src/models/system_info.rs
index 32f38a5..f1c0c6f 100644
--- a/src/models/system_info.rs
+++ b/src/models/system_info.rs
@@ -16,8 +16,8 @@ pub struct SystemInfo {
     pub software_version: String,
     #[serde(rename = "hardwareVersion")]
     pub hardware_version: String,
-    #[serde(rename = "buildTag")]
-    pub build_tag: String,
+    #[serde(rename = "softwareBuild", skip_serializing_if = "Option::is_none")]
+    pub software_build: Option<String>,
     #[serde(rename = "deviceId")]
     pub device_id: String,
     #[serde(rename = "pcr")]
@@ -31,7 +31,6 @@ impl SystemInfo {
         firmware_version: String,
         software_version: String,
         hardware_version: String,
-        build_tag: String,
         device_id: String,
         pcr: serde_json::Value,
         ak_pub: serde_json::Value,
@@ -40,7 +39,7 @@ impl SystemInfo {
             firmware_version,
             software_version,
             hardware_version,
-            build_tag,
+            software_build: None,
             device_id,
             pcr,
             ak_pub,