diff --git a/Cargo.toml b/Cargo.toml
index ad2fec4..9060133 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,20 +15,20 @@ edition = "2018"
 
 [dependencies]
 anyhow = "1.0"
-base64 = "0.21"
-lazy_static = "1.4"
+base64 = "0.22"
+lazy_static = "1"
 log = "0.4"
 openssl = "0.10"
-serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
 time = { version = "0.3", features = ["local-offset"] }
 time-fmt = "0.3"
 time-tz = "1"
-ureq = "1"
+ureq = "2"
 
 [dev-dependencies]
 doc-comment = "0.3"
-env_logger = { version = "0.10", default-features = false }
+env_logger = { version = "0.11", default-features = false }
 futures = "0.1.25"
 hyper = "0.12"
 regex = "1.4"
diff --git a/src/cert.rs b/src/cert.rs
index ccd9c23..eedb6d6 100644
--- a/src/cert.rs
+++ b/src/cert.rs
@@ -59,15 +59,12 @@ pub(crate) fn create_csr(pkey: &PKey<pkey::Private>, domains: &[&str]) -> Result
     // set all domains as alt names
     let mut stack = Stack::new()?;
     let ctx = req_bld.x509v3_context(None);
-    let as_lst = domains
-        .iter()
-        .map(|&e| format!("DNS:{}", e))
-        .collect::<Vec<_>>()
-        .join(", ");
-    let as_lst = as_lst[4..].to_string();
     let mut an = SubjectAlternativeName::new();
-    an.dns(&as_lst);
-    let ext = an.build(&ctx)?;
+    for d in domains {
+        an.dns(d);
+    }
+
+    let ext = an.build(&ctx).context("SubjectAlternativeName::build")?;
     stack.push(ext).expect("Stack::push");
     req_bld.add_extensions(&stack)?;
 
diff --git a/src/req.rs b/src/req.rs
index b093b66..6b0dd5e 100644
--- a/src/req.rs
+++ b/src/req.rs
@@ -3,39 +3,43 @@ use crate::error::*;
 
 pub(crate) type ReqResult<T> = std::result::Result<T, ApiProblem>;
 
-pub(crate) fn req_get(url: &str) -> ureq::Response {
-    let mut req = ureq::get(url);
-    req_configure(&mut req);
+const TIMEOUT_DURATION: std::time::Duration = std::time::Duration::from_secs(30);
+
+pub(crate) fn req_get(url: &str) -> Result<ureq::Response, ureq::Error> {
+    let req = ureq::get(url).timeout(TIMEOUT_DURATION);
     trace!("{:?}", req);
     req.call()
 }
 
-pub(crate) fn req_head(url: &str) -> ureq::Response {
-    let mut req = ureq::head(url);
-    req_configure(&mut req);
+pub(crate) fn req_head(url: &str) -> Result<ureq::Response, ureq::Error> {
+    let req = ureq::head(url).timeout(TIMEOUT_DURATION);
     trace!("{:?}", req);
     req.call()
 }
 
-pub(crate) fn req_post(url: &str, body: &str) -> ureq::Response {
-    let mut req = ureq::post(url);
-    req.set("content-type", "application/jose+json");
-    req_configure(&mut req);
+pub(crate) fn req_post(url: &str, body: &str) -> Result<ureq::Response, ureq::Error> {
+    let req = ureq::post(url)
+        .set("content-type", "application/jose+json")
+        .timeout(TIMEOUT_DURATION);
     trace!("{:?} {}", req, body);
     req.send_string(body)
 }
 
-fn req_configure(req: &mut ureq::Request) {
-    req.timeout_connect(30_000);
-    req.timeout_read(30_000);
-    req.timeout_write(30_000);
-}
-
-pub(crate) fn req_handle_error(res: ureq::Response) -> ReqResult<ureq::Response> {
-    // ok responses pass through
-    if res.ok() {
-        return Ok(res);
-    }
+pub(crate) fn req_handle_error(
+    res: Result<ureq::Response, ureq::Error>,
+) -> ReqResult<ureq::Response> {
+    let res = match res {
+        // ok responses pass through
+        Ok(res) => return Ok(res),
+        Err(ureq::Error::Status(_, res)) => res,
+        Err(ureq::Error::Transport(_)) => {
+            return Err(ApiProblem {
+                _type: "httpReqError".into(),
+                detail: Some("Transport error".into()),
+                subproblems: None,
+            })
+        }
+    };
 
     let problem = if res.content_type() == "application/problem+json" {
         // if we were sent a problem+json, deserialize it
diff --git a/src/test/mod.rs b/src/test/mod.rs
index 1e528f4..797d6ba 100644
--- a/src/test/mod.rs
+++ b/src/test/mod.rs
@@ -212,5 +212,5 @@ pub fn with_directory_server() -> TestServer {
 pub fn test_make_directory() {
     let server = with_directory_server();
     let res = ureq::get(&server.dir_url).call();
-    assert!(res.ok());
+    assert!(res.is_ok());
 }
diff --git a/src/trans.rs b/src/trans.rs
index 58d0eeb..8665ed7 100644
--- a/src/trans.rs
+++ b/src/trans.rs
@@ -115,7 +115,13 @@ impl NoncePool {
         }
     }
 
-    fn extract_nonce(&self, res: &ureq::Response) {
+    fn extract_nonce(&self, res: &std::result::Result<ureq::Response, ureq::Error>) {
+        let res = match res {
+            Ok(res) => res,
+            Err(ureq::Error::Status(_, res)) => res,
+            Err(ureq::Error::Transport(_)) => return,
+        };
+
         if let Some(nonce) = res.header("replay-nonce") {
             trace!("Extract nonce");
             let mut pool = self.pool.lock().unwrap();
@@ -136,6 +142,15 @@ impl NoncePool {
         }
         debug!("Request new nonce");
         let res = req_head(&self.nonce_url);
+
+        let res = match res {
+            Ok(res) => res,
+            Err(ureq::Error::Status(_, res)) => res,
+            Err(ureq::Error::Transport(err)) => {
+                return Err(Error::new(err).context("Transport error during request"))
+            }
+        };
+
         Ok(req_expect_header(&res, "replay-nonce")?)
     }
 }
diff --git a/src/util.rs b/src/util.rs
index b4d54a5..c883dc8 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -1,17 +1,11 @@
-use base64::engine::Engine;
-use lazy_static::lazy_static;
+use base64::Engine;
 use serde::de::DeserializeOwned;
 
 use crate::error::*;
 use crate::req::req_safe_read_body;
 
-lazy_static! {
-    static ref BASE64_CONFIG: base64::engine::general_purpose::GeneralPurpose =
-        base64::engine::general_purpose::URL_SAFE;
-}
-
 pub(crate) fn base64url<T: ?Sized + AsRef<[u8]>>(input: &T) -> String {
-    BASE64_CONFIG.encode(input)
+    base64::prelude::BASE64_URL_SAFE_NO_PAD.encode(input)
 }
 
 pub(crate) fn read_json<T: DeserializeOwned>(res: ureq::Response) -> Result<T> {