diff --git a/src/checker.rs b/src/checker.rs
index cef4768..1fc6027 100644
--- a/src/checker.rs
+++ b/src/checker.rs
@@ -72,6 +72,10 @@ pub async fn check_all<R: reqwest::dns::Resolve + 'static>(
     }
 
     drop(queue);
+    drop(config);
+    drop(dns_resolver);
+    drop(token);
+    drop(tx);
 
     while let Some(res) = join_set.join_next().await {
         match res {
diff --git a/src/http.rs b/src/http.rs
index f0ba64f..6916a45 100644
--- a/src/http.rs
+++ b/src/http.rs
@@ -49,6 +49,7 @@ impl reqwest::dns::Resolve for HickoryDnsResolver {
         let resolver = Arc::clone(&self.0);
         Box::pin(async move {
             let lookup = resolver.lookup_ip(name.as_str()).await?;
+            drop(resolver);
             let addrs: reqwest::dns::Addrs = Box::new(
                 lookup.into_iter().map(|ip_addr| SocketAddr::new(ip_addr, 0)),
             );
diff --git a/src/ipdb.rs b/src/ipdb.rs
index 4ede496..d5e72d5 100644
--- a/src/ipdb.rs
+++ b/src/ipdb.rs
@@ -196,6 +196,7 @@ impl DbType {
                 db_path.display()
             );
         }
+        drop(db_path);
 
         if let Some(etag_value) = etag {
             self.save_etag(etag_value).await.wrap_err_with(move || {
diff --git a/src/scraper.rs b/src/scraper.rs
index 60ab212..7aceeab 100644
--- a/src/scraper.rs
+++ b/src/scraper.rs
@@ -156,11 +156,18 @@ pub async fn scrape_all(
         }
     }
 
+    drop(config);
+    drop(http_client);
+    drop(token);
+    drop(tx);
+
     while let Some(res) = join_set.join_next().await {
         res.wrap_err("proxy scraping task panicked or was cancelled")?
             .wrap_err("proxy scraping task failed")?;
     }
 
+    drop(join_set);
+
     Ok(Arc::into_inner(proxies)
         .ok_or_eyre("failed to unwrap Arc")?
         .into_inner()