diff --git a/interop/Cargo.toml b/interop/Cargo.toml
index 2956f9219..5922f519e 100644
--- a/interop/Cargo.toml
+++ b/interop/Cargo.toml
@@ -17,6 +17,7 @@ path = "src/bin/server.rs"
 [dependencies]
 async-stream = "0.3"
 bytes = "1.0"
+clap = {version = "3", features = ["derive"]}
 console = "0.14"
 futures-core = "0.3"
 futures-util = "0.3"
@@ -25,7 +26,6 @@ http-body = "0.4.2"
 hyper = "0.14"
 prost = "0.9"
 prost-derive = "0.9"
-structopt = "0.3"
 tokio = {version = "1.0", features = ["rt-multi-thread", "time", "macros", "fs"]}
 tokio-stream = "0.1"
 tonic = {path = "../tonic", features = ["tls"]}
diff --git a/interop/src/bin/client.rs b/interop/src/bin/client.rs
index 1f676faeb..48ab14677 100644
--- a/interop/src/bin/client.rs
+++ b/interop/src/bin/client.rs
@@ -1,20 +1,15 @@
+use clap::Parser;
 use interop::client;
 use std::time::Duration;
-use structopt::{clap::arg_enum, StructOpt};
 use tonic::transport::Endpoint;
 use tonic::transport::{Certificate, ClientTlsConfig};
 
-#[derive(StructOpt)]
+#[derive(Parser)]
 struct Opts {
-    #[structopt(name = "use_tls", long)]
+    #[clap(name = "use_tls", long)]
     use_tls: bool,
 
-    #[structopt(
-        long = "test_case",
-        use_delimiter = true,
-        min_values = 1,
-        possible_values = &Testcase::variants()
-    )]
+    #[clap(long = "test_case", use_delimiter = true, min_values = 1, arg_enum)]
     test_case: Vec<Testcase>,
 }
 
@@ -22,7 +17,7 @@ struct Opts {
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
     interop::trace_init();
 
-    let matches = Opts::from_args();
+    let matches = Opts::parse();
 
     let test_cases = matches.test_case;
 
@@ -98,33 +93,32 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     Ok(())
 }
 
-arg_enum! {
-    #[derive(Debug, Copy, Clone)]
-    #[allow(non_camel_case_types)]
-    enum Testcase {
-        empty_unary,
-        cacheable_unary,
-        large_unary,
-        client_compressed_unary,
-        server_compressed_unary,
-        client_streaming,
-        client_compressed_streaming,
-        server_streaming,
-        server_compressed_streaming,
-        ping_pong,
-        empty_stream,
-        compute_engine_creds,
-        jwt_token_creds,
-        oauth2_auth_token,
-        per_rpc_creds,
-        custom_metadata,
-        status_code_and_message,
-        special_status_message,
-        unimplemented_method,
-        unimplemented_service,
-        cancel_after_begin,
-        cancel_after_first_response,
-        timeout_on_sleeping_server,
-        concurrent_large_unary
-    }
+#[derive(Debug, Copy, Clone, clap::ArgEnum)]
+#[clap(rename_all = "verbatim")]
+#[allow(non_camel_case_types)]
+enum Testcase {
+    empty_unary,
+    cacheable_unary,
+    large_unary,
+    client_compressed_unary,
+    server_compressed_unary,
+    client_streaming,
+    client_compressed_streaming,
+    server_streaming,
+    server_compressed_streaming,
+    ping_pong,
+    empty_stream,
+    compute_engine_creds,
+    jwt_token_creds,
+    oauth2_auth_token,
+    per_rpc_creds,
+    custom_metadata,
+    status_code_and_message,
+    special_status_message,
+    unimplemented_method,
+    unimplemented_service,
+    cancel_after_begin,
+    cancel_after_first_response,
+    timeout_on_sleeping_server,
+    concurrent_large_unary,
 }
diff --git a/interop/src/bin/server.rs b/interop/src/bin/server.rs
index b48987dad..bed34def4 100644
--- a/interop/src/bin/server.rs
+++ b/interop/src/bin/server.rs
@@ -1,11 +1,11 @@
+use clap::Parser;
 use interop::server;
-use structopt::StructOpt;
 use tonic::transport::Server;
 use tonic::transport::{Identity, ServerTlsConfig};
 
-#[derive(StructOpt)]
+#[derive(Parser)]
 struct Opts {
-    #[structopt(name = "use_tls", long)]
+    #[clap(name = "use_tls", long)]
     use_tls: bool,
 }
 
@@ -13,7 +13,7 @@ struct Opts {
 async fn main() -> std::result::Result<(), Box<dyn std::error::Error>> {
     interop::trace_init();
 
-    let matches = Opts::from_args();
+    let matches = Opts::parse();
 
     let addr = "127.0.0.1:10000".parse().unwrap();