diff --git a/src/main/java/com/imsweb/staging/tnm/TnmSchemaLookup.java b/src/main/java/com/imsweb/staging/tnm/TnmSchemaLookup.java
index 798110c0..b98e34d9 100644
--- a/src/main/java/com/imsweb/staging/tnm/TnmSchemaLookup.java
+++ b/src/main/java/com/imsweb/staging/tnm/TnmSchemaLookup.java
@@ -9,12 +9,12 @@
 
 import static com.imsweb.staging.entities.StagingData.HISTOLOGY_KEY;
 import static com.imsweb.staging.entities.StagingData.PRIMARY_SITE_KEY;
-import static com.imsweb.staging.tnm.TnmStagingData.SEX_KEY;
+import static com.imsweb.staging.tnm.TnmStagingData.SEX_AT_BIRTH_KEY;
 import static com.imsweb.staging.tnm.TnmStagingData.SSF25_KEY;
 
 public class TnmSchemaLookup extends SchemaLookup {
 
-    private static final Set<String> _ALLOWED_KEYS = Set.of(PRIMARY_SITE_KEY, HISTOLOGY_KEY, SSF25_KEY, SEX_KEY);
+    private static final Set<String> _ALLOWED_KEYS = Set.of(PRIMARY_SITE_KEY, HISTOLOGY_KEY, SSF25_KEY, SEX_AT_BIRTH_KEY);
 
     /**
      * Constructor
diff --git a/src/main/java/com/imsweb/staging/tnm/TnmStagingData.java b/src/main/java/com/imsweb/staging/tnm/TnmStagingData.java
index 57cca24a..e932a5bd 100644
--- a/src/main/java/com/imsweb/staging/tnm/TnmStagingData.java
+++ b/src/main/java/com/imsweb/staging/tnm/TnmStagingData.java
@@ -8,7 +8,7 @@
 public class TnmStagingData extends StagingData {
 
     // key definitions
-    public static final String SEX_KEY = "sex";
+    public static final String SEX_AT_BIRTH_KEY = "sex_at_birth";
     public static final String SSF25_KEY = "ssf25";
 
     // SSF prefix
@@ -20,7 +20,7 @@ public enum TnmInput {
         HISTOLOGY("hist"),
         BEHAVIOR("behavior"),
         GRADE("grade"),
-        SEX("sex"),
+        SEX("sex_at_birth"),
         DX_YEAR("year_dx"),
         AGE_AT_DX("age_dx"),
         CLIN_STAGE_GROUP_DIRECT("clin_stage_group_direct"),
diff --git a/src/test/java/com/imsweb/staging/tnm/TnmStagingTest.java b/src/test/java/com/imsweb/staging/tnm/TnmStagingTest.java
index 2a13becb..259516dd 100644
--- a/src/test/java/com/imsweb/staging/tnm/TnmStagingTest.java
+++ b/src/test/java/com/imsweb/staging/tnm/TnmStagingTest.java
@@ -54,7 +54,7 @@ public String getAlgorithm() {
 
     @Override
     public String getVersion() {
-        return "2.0";
+        return "2.1";
     }
 
     @Test
@@ -69,7 +69,7 @@ void testBasicInitialization() {
     @Test
     void testDescriminatorKeys() {
         assertEquals(new HashSet<>(Collections.singletonList("ssf25")), _STAGING.getSchema("nasopharynx").getSchemaDiscriminators());
-        assertEquals(new HashSet<>(Collections.singletonList("sex")), _STAGING.getSchema("peritoneum_female_gen").getSchemaDiscriminators());
+        assertEquals(new HashSet<>(Collections.singletonList("sex_at_birth")), _STAGING.getSchema("peritoneum_female_gen").getSchemaDiscriminators());
     }
 
     @Test
diff --git a/src/test/java/com/imsweb/staging/tnm/TnmUpdateFromAPI.java b/src/test/java/com/imsweb/staging/tnm/TnmUpdateFromAPI.java
index d239ecc6..b319534b 100644
--- a/src/test/java/com/imsweb/staging/tnm/TnmUpdateFromAPI.java
+++ b/src/test/java/com/imsweb/staging/tnm/TnmUpdateFromAPI.java
@@ -13,7 +13,7 @@
 public class TnmUpdateFromAPI {
 
     public static void main(String[] args) throws IOException {
-        UpdaterUtils.update("tnm", "2.0", new HashSet<>(Collections.singletonList("STAGING")), Paths.get("c:/dev/tmp"));
+        UpdaterUtils.update("tnm", "2.1", new HashSet<>(Collections.singletonList("STAGING")), Paths.get("c:/dev/tmp"));
     }
 
 }
diff --git a/src/test/resources/algorithms/tnm-2.0.zip b/src/test/resources/algorithms/tnm-2.0.zip
deleted file mode 100644
index 70339ccb..00000000
Binary files a/src/test/resources/algorithms/tnm-2.0.zip and /dev/null differ
diff --git a/src/test/resources/algorithms/tnm-2.1.zip b/src/test/resources/algorithms/tnm-2.1.zip
new file mode 100644
index 00000000..5af010a3
Binary files /dev/null and b/src/test/resources/algorithms/tnm-2.1.zip differ