diff --git a/acmed/src/endpoint.rs b/acmed/src/endpoint.rs
index a4016c1..5279c7b 100644
--- a/acmed/src/endpoint.rs
+++ b/acmed/src/endpoint.rs
@@ -2,8 +2,8 @@ use crate::acme_proto::structs::Directory;
 use crate::duration::parse_duration;
 use acme_common::error::Error;
 use std::cmp;
-use std::thread;
 use std::time::{Duration, Instant};
+use tokio::time::sleep;
 
 #[derive(Clone, Debug)]
 pub struct Endpoint {
@@ -65,19 +65,19 @@ impl RateLimit {
 		})
 	}
 
-	pub fn block_until_allowed(&mut self) {
+	pub async fn block_until_allowed(&mut self) {
 		if self.limits.is_empty() {
 			return;
 		}
-		let sleep_duration = self.get_sleep_duration();
+		let mut sleep_duration = self.get_sleep_duration();
 		loop {
+			sleep(sleep_duration).await;
 			self.prune_log();
 			if self.request_allowed() {
 				self.query_log.push(Instant::now());
 				return;
 			}
-			// TODO: find a better sleep duration
-			thread::sleep(sleep_duration);
+			sleep_duration = self.get_sleep_duration();
 		}
 	}
 
diff --git a/acmed/src/http.rs b/acmed/src/http.rs
index 39fc81d..8ac6d8a 100644
--- a/acmed/src/http.rs
+++ b/acmed/src/http.rs
@@ -107,7 +107,7 @@ fn is_nonce(data: &str) -> bool {
 }
 
 async fn new_nonce(endpoint: &mut Endpoint) -> Result<(), HttpError> {
-	rate_limit(endpoint);
+	rate_limit(endpoint).await;
 	let url = endpoint.dir.new_nonce.clone();
 	let _ = get(endpoint, &url).await?;
 	Ok(())
@@ -134,8 +134,8 @@ fn check_status(response: &Response) -> Result<(), Error> {
 	Ok(())
 }
 
-fn rate_limit(endpoint: &mut Endpoint) {
-	endpoint.rl.block_until_allowed();
+async fn rate_limit(endpoint: &mut Endpoint) {
+	endpoint.rl.block_until_allowed().await;
 }
 
 fn header_to_string(header_value: &HeaderValue) -> Result<String, Error> {
@@ -175,7 +175,7 @@ fn get_client(root_certs: &[String]) -> Result<Client, Error> {
 
 pub async fn get(endpoint: &mut Endpoint, url: &str) -> Result<ValidHttpResponse, HttpError> {
 	let client = get_client(&endpoint.root_certificates)?;
-	rate_limit(endpoint);
+	rate_limit(endpoint).await;
 	let response = client
 		.get(url)
 		.header(header::ACCEPT, CONTENT_TYPE_JSON)
@@ -208,7 +208,7 @@ where
 		request = request.header(header::CONTENT_TYPE, content_type);
 		let nonce = &endpoint.nonce.clone().unwrap_or_default();
 		let body = data_builder(nonce, url)?;
-		rate_limit(endpoint);
+		rate_limit(endpoint).await;
 		log::trace!("POST request body: {body}");
 		let response = request.body(body).send().await?;
 		update_nonce(endpoint, &response)?;