diff --git a/google-apis-common/Cargo.toml b/google-apis-common/Cargo.toml
index aa601650a3..ff2249c544 100644
--- a/google-apis-common/Cargo.toml
+++ b/google-apis-common/Cargo.toml
@@ -16,7 +16,7 @@ doctest = false
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-mime = "^ 0.2.0"
+mime = "^ 0.3"
 serde = { version = "^ 1.0", features = ["derive"] }
 serde_with = "2.0.1"
 serde_json = "^ 1.0"
diff --git a/google-apis-common/src/lib.rs b/google-apis-common/src/lib.rs
index e66f011465..67f9e9cd97 100644
--- a/google-apis-common/src/lib.rs
+++ b/google-apis-common/src/lib.rs
@@ -17,7 +17,7 @@ use hyper::header::{HeaderMap, AUTHORIZATION, CONTENT_LENGTH, CONTENT_TYPE, USER
 use hyper::Method;
 use hyper::StatusCode;
 
-use mime::{Attr, Mime, SubLevel, TopLevel, Value};
+use mime::Mime;
 
 use serde_json as json;
 
@@ -358,7 +358,7 @@ impl<'a> MultiPartReader<'a> {
         let mut headers = HeaderMap::new();
         headers.insert(
             CONTENT_TYPE,
-            hyper::header::HeaderValue::from_str(&format!("{}", mime_type)).unwrap(),
+            hyper::header::HeaderValue::from_str(&mime_type.to_string()).unwrap(),
         );
         headers.insert(CONTENT_LENGTH, size.into());
         self.raw_parts.push((headers, reader));
@@ -368,14 +368,8 @@ impl<'a> MultiPartReader<'a> {
     /// Returns the mime-type representing our multi-part message.
     /// Use it with the ContentType header.
     pub fn mime_type(&self) -> Mime {
-        Mime(
-            TopLevel::Multipart,
-            SubLevel::Ext("related".to_string()),
-            vec![(
-                Attr::Ext("boundary".to_string()),
-                Value::Ext(BOUNDARY.to_string()),
-            )],
-        )
+        Mime::from_str(&format!("multipart/related;boundary={}", BOUNDARY))
+            .expect("valid mimetype")
     }
 
     /// Returns true if we are totally used
diff --git a/src/generator/templates/Cargo.toml.mako b/src/generator/templates/Cargo.toml.mako
index 3001397c39..3c0b8ceb41 100644
--- a/src/generator/templates/Cargo.toml.mako
+++ b/src/generator/templates/Cargo.toml.mako
@@ -26,11 +26,10 @@ path = "src/main.rs"
 % endif
 
 [dependencies]
-## TODO: temporary, remove when yup-oauth2 is optional
 anyhow = "^ 1.0"
 hyper-rustls = "0.23.0"
 ## Must match the one hyper uses, otherwise there are duplicate similarly named `Mime` structs
-mime = "^ 0.2.0"
+mime = "^ 0.3.0"
 serde = { version = "^ 1.0", features = ["derive"] }
 serde_json = "^ 1.0"
 itertools = "^ 0.10"
diff --git a/src/generator/templates/api/lib/mbuild.mako b/src/generator/templates/api/lib/mbuild.mako
index 7e56b03828..c4983b61e5 100644
--- a/src/generator/templates/api/lib/mbuild.mako
+++ b/src/generator/templates/api/lib/mbuild.mako
@@ -689,7 +689,7 @@ else {
         let url = url::Url::parse_with_params(&url, params).unwrap();
 
         % if request_value:
-        let mut json_mime_type: mime::Mime = "application/json".parse().unwrap();
+        let mut json_mime_type = mime::APPLICATION_JSON;
         let mut request_value_reader =
             {
                 let mut value = json::value::to_value(&self.${property(REQUEST_VALUE_PROPERTY_NAME)}).expect("serde to work");