diff --git a/lib/rbnacl/nacl.rb b/lib/rbnacl/nacl.rb
index efad014..7240448 100644
--- a/lib/rbnacl/nacl.rb
+++ b/lib/rbnacl/nacl.rb
@@ -118,11 +118,19 @@ def self.#{name}(*args)
     
     ONETIME_KEYBYTES = 32
     ONETIME_BYTES = 16
+    if NaCl.supported_version? :libsodium, '0.4.3'
+      crypto_onetimeauth_poly1305 = :crypto_onetimeauth_poly1305
+      crypto_onetimeauth_poly1305_verify = :crypto_onetimeauth_poly1305_verify
+    else
+      crypto_onetimeauth_poly1305 = :crypto_onetimeauth_poly1305_ref
+      crypto_onetimeauth_poly1305_verify = :crypto_onetimeauth_poly1305_verify_ref
+    end
+
     wrap_nacl_function :crypto_auth_onetime,
-                       :crypto_onetimeauth_poly1305_ref,
+                       crypto_onetimeauth_poly1305,
                        [:pointer, :pointer, :long_long, :pointer]
     wrap_nacl_function :crypto_auth_onetime_verify,
-                       :crypto_onetimeauth_poly1305_ref_verify,
+                       crypto_onetimeauth_poly1305_verify,
                        [:pointer, :pointer, :long_long, :pointer]
 
     wrap_nacl_function :random_bytes,
diff --git a/lib/rbnacl/rake_tasks.rb b/lib/rbnacl/rake_tasks.rb
index 17c2de2..553ff6f 100644
--- a/lib/rbnacl/rake_tasks.rb
+++ b/lib/rbnacl/rake_tasks.rb
@@ -3,8 +3,8 @@
 require 'rake/clean'
 require 'digest/sha2'
 
-LIBSODIUM_VERSION = "0.4.2"
-LIBSODIUM_DIGEST  = "1a7901cdd127471724e854a8eb478247dc0ca67be549345c75fc6f2d4e05ed39"
+LIBSODIUM_VERSION = "0.4.3"
+LIBSODIUM_DIGEST  = "599ce19ae6ace2d30aee353b931088f720713c4e1d0b2918ed46de1914fb6042"
 
 def sh_hidden(command)
   STDERR.puts("*** Executing: #{command}")