diff --git a/src/Cryptography/Argon2Parameters.cs b/src/Cryptography/Argon2Parameters.cs
index 9de21294..febf3526 100644
--- a/src/Cryptography/Argon2Parameters.cs
+++ b/src/Cryptography/Argon2Parameters.cs
@@ -1,3 +1,4 @@
+using System.Diagnostics.CodeAnalysis;
 using System.Runtime.InteropServices;
 
 namespace NSec.Cryptography
@@ -8,5 +9,8 @@ public struct Argon2Parameters
         public int DegreeOfParallelism;
         public long MemorySize;
         public long NumberOfPasses;
+
+        [SuppressMessage("Performance", "CA1822")]
+        public readonly int Version => 0x13; // copied from libsodium/crypto_pwhash/argon2/argon2-core.h
     }
 }
diff --git a/tests/Algorithms/Argon2iTests.cs b/tests/Algorithms/Argon2iTests.cs
index d99198bc..7adac324 100644
--- a/tests/Algorithms/Argon2iTests.cs
+++ b/tests/Algorithms/Argon2iTests.cs
@@ -21,6 +21,7 @@ public static void Properties()
             Assert.Equal(16, a.MinSaltSize);
             Assert.Equal(int.MaxValue, a.MaxCount);
 
+            Assert.Equal(19, actual.Version);
             Assert.Equal(expected.DegreeOfParallelism, actual.DegreeOfParallelism);
             Assert.Equal(expected.MemorySize, actual.MemorySize);
             Assert.Equal(expected.NumberOfPasses, actual.NumberOfPasses);
diff --git a/tests/Algorithms/Argon2idTests.cs b/tests/Algorithms/Argon2idTests.cs
index 58b0282e..a88c8cba 100644
--- a/tests/Algorithms/Argon2idTests.cs
+++ b/tests/Algorithms/Argon2idTests.cs
@@ -20,6 +20,7 @@ public static void Properties()
             Assert.Equal(16, a.MinSaltSize);
             Assert.Equal(int.MaxValue, a.MaxCount);
 
+            Assert.Equal(19, actual.Version);
             Assert.Equal(expected.DegreeOfParallelism, actual.DegreeOfParallelism);
             Assert.Equal(expected.MemorySize, actual.MemorySize);
             Assert.Equal(expected.NumberOfPasses, actual.NumberOfPasses);