diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 28cf0ee..31435db 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -72,7 +72,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        toolchain: [ "1.41.1", "stable", "nightly" ]
+        toolchain: [ "1.42", "stable", "nightly" ]
 
     steps:
       - uses: actions/checkout@v2
diff --git a/Cargo.toml b/Cargo.toml
index 54f3593..b78fbf5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ documentation = "https://docs.rs/bitcoind/"
 edition = "2018"
 
 [dependencies]
-bitcoincore-rpc = "0.16.0"
+bitcoincore-rpc = "0.15.0"
 tempfile = "3.1"
 log = "0.4"
 which = "4.2.5"
@@ -18,14 +18,12 @@ which = "4.2.5"
 env_logger = "0.8"
 
 [build-dependencies]
-bitcoin_hashes = "0.11"
+bitcoin_hashes = "0.10"
+ureq = "2.1"
+flate2 = "1.0"
 tar = "0.4"
 zip = "0.5"
-
-# allows to keep MSRV 1.41.1
-ureq = "1.0"  
 filetime = "=0.2.15"
-flate2 = "=1.0.22"
 
 [features]
 "23_0" = []
diff --git a/build.rs b/build.rs
index 80be5c9..69d1aa9 100644
--- a/build.rs
+++ b/build.rs
@@ -103,10 +103,19 @@ fn main() {
         );
         println!("url:{}", url);
         let mut downloaded_bytes = Vec::new();
-        let resp = ureq::get(&url).call();
-        assert_eq!(resp.status(), 200, "url {} didn't return 200", url);
 
-        let _size = resp
+        let http_proxy = std::env::var("HTTPS_PROXY").or_else(|_| std::env::var("HTTP_PROXY"));
+        let agent = if let Ok(proxy) = http_proxy {
+            let proxy = ureq::Proxy::new(proxy).unwrap();
+            ureq::AgentBuilder::new().proxy(proxy).build()
+        } else {
+            ureq::AgentBuilder::new().build()
+        };
+
+        let _size = agent
+            .get(&url)
+            .call()
+            .unwrap()
             .into_reader()
             .read_to_end(&mut downloaded_bytes)
             .unwrap();
diff --git a/src/lib.rs b/src/lib.rs
index a22c067..f3ac865 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -642,7 +642,7 @@ mod test {
 
         // bob wallet may not be immediately updated
         for _ in 0..30 {
-            if bob.get_balances().unwrap().mine.untrusted_pending.to_sat() > 0 {
+            if bob.get_balances().unwrap().mine.untrusted_pending.as_sat() > 0 {
                 break;
             }
             std::thread::sleep(std::time::Duration::from_millis(100));