diff --git a/openssl-sys/src/tls1.rs b/openssl-sys/src/tls1.rs
index f7ae302046b0f9a8fa72169ea185e9e6f4ac1108..2cb08a91f352868b9de2284b27b77333ce300a8d 100644
--- a/openssl-sys/src/tls1.rs
+++ b/openssl-sys/src/tls1.rs
@@ -10,6 +10,10 @@ pub const TLS1_2_VERSION: c_int = 0x303;
 #[cfg(any(ossl111, libressl340))]
 pub const TLS1_3_VERSION: c_int = 0x304;
 
+pub const DTLS1_VERSION: c_int = 0xFEFF;
+#[cfg(any(ossl102, libressl332))]
+pub const DTLS1_2_VERSION: c_int = 0xFEFD;
+
 pub const TLS1_AD_DECODE_ERROR: c_int = 50;
 pub const TLS1_AD_UNRECOGNIZED_NAME: c_int = 112;
 
diff --git a/openssl/src/ssl/mod.rs b/openssl/src/ssl/mod.rs
index 6ef356d36da8a1b283bc74a3288386e4e5a1350b..5b8775c98c0c729df483cb1b65a2d5fe4dbe4637 100644
--- a/openssl/src/ssl/mod.rs
+++ b/openssl/src/ssl/mod.rs
@@ -644,6 +644,17 @@ impl SslVersion {
     /// Requires OpenSSL 1.1.1 or LibreSSL 3.4.0 or newer.
     #[cfg(any(ossl111, libressl340))]
     pub const TLS1_3: SslVersion = SslVersion(ffi::TLS1_3_VERSION);
+
+    /// DTLSv1.0
+    ///
+    /// DTLS 1.0 corresponds to TLS 1.1.
+    pub const DTLS1: SslVersion = SslVersion(ffi::DTLS1_VERSION);
+
+    /// DTLSv1.2
+    ///
+    /// DTLS 1.2 corresponds to TLS 1.2 to harmonize versions. There was never a DTLS 1.1.
+    #[cfg(any(ossl102, libressl332))]
+    pub const DTLS1_2: SslVersion = SslVersion(ffi::DTLS1_2_VERSION);
 }
 
 cfg_if! {