diff --git a/Cargo.lock b/Cargo.lock
index 590dcd2..c223a6a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3140,7 +3140,7 @@ dependencies = [
 
 [[package]]
 name = "wstunnel"
-version = "10.0.2"
+version = "10.0.1"
 dependencies = [
  "ahash",
  "anyhow",
diff --git a/Cargo.toml b/Cargo.toml
index 9af2aa6..9ce2ef8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wstunnel"
-version = "10.0.2"
+version = "10.0.1"
 edition = "2021"
 repository = "https://github.com/erebe/wstunnel.git"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
diff --git a/src/embedded_certificate.rs b/src/embedded_certificate.rs
index 0ba6cbc..3bcd3ed 100644
--- a/src/embedded_certificate.rs
+++ b/src/embedded_certificate.rs
@@ -15,13 +15,13 @@ pub static TLS_CERTIFICATE: LazyLock<(Vec<CertificateDer<'static>>, PrivateKeyDe
     let el = now.elapsed();
     let year = 2024 - (el.as_nanos() % 2) as i32;
     let month = 1 + (el.as_nanos() % 12) as u8;
-    let day = 1 + (el.as_nanos() % 31) as u8;
+    let day = 1 + (el.as_nanos() % 28) as u8;
     cert.not_before = date_time_ymd(year, month, day);
 
     let el = now.elapsed();
     let year = 2024 + (el.as_nanos() % 50) as i32;
     let month = 1 + (el.as_nanos() % 12) as u8;
-    let day = 1 + (el.as_nanos() % 31) as u8;
+    let day = 1 + (el.as_nanos() % 28) as u8;
     cert.not_after = date_time_ymd(year, month, day);
 
     let cert = cert.self_signed(&key_pair).unwrap().der().clone();