diff --git a/include/flags.h b/include/flags.h
index 047aede..1fe2445 100644
--- a/include/flags.h
+++ b/include/flags.h
@@ -71,6 +71,7 @@ typedef struct
     why2_bool no_check; //BOOLEAN FOR SKIPPING WHY2_VERSION CHECK
     why2_bool no_output; //BOOLEAN FOR NOT PRINTING OUTPUT WHEN ENCRYPTING/DECRYPTING
     why2_bool update; //BOOLEAN FOR UPDATING YOUR WHY WHY2_VERSION IF OLD IS USED
+    enum WHY2_TEXT_KEY_CHAIN_VERSIONS version; //VERSION OF tkch
 } why2_input_flags;
 
 typedef struct
diff --git a/src/core/app/main.c b/src/core/app/main.c
index d878c43..208759c 100644
--- a/src/core/app/main.c
+++ b/src/core/app/main.c
@@ -23,7 +23,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 int main(void)
 {
     //SET FLAGS
-    why2_set_flags((why2_input_flags) {1, 1, 0});
+    why2_set_flags((why2_input_flags) { 1, 1, 0, WHY2_v4 });
 
     //RUN ENCRYPTION WITH WHY2_TEXT_TO_ENCRYPT, GENERATE NEW KEY AND DO NOT CHECK FOR ACTIVE WHY2_VERSION & PREVENT ANY OUTPUT
     why2_output_flags encryptedText = why2_encrypt_text(WHY2_TEXT_TO_ENCRYPT, NULL);
diff --git a/src/core/lib/flags.c b/src/core/lib/flags.c
index e606d9e..31a0db8 100644
--- a/src/core/lib/flags.c
+++ b/src/core/lib/flags.c
@@ -25,7 +25,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <why2/memory.h>
 
 //CONSTS (this is just local)
-#define DEFAULT_FLAGS (why2_input_flags) { 0, 0, 0 }
+#define DEFAULT_FLAGS (why2_input_flags) { 0, 0, 0, WHY2_v4}
 #define DEFAULT_MEMORY_IDENTIFIER ""
 
 int encryptionOperation(int text, int encryptedText);
diff --git a/src/core/lib/test/main.c b/src/core/lib/test/main.c
index 54f102d..42cd11f 100644
--- a/src/core/lib/test/main.c
+++ b/src/core/lib/test/main.c
@@ -43,7 +43,8 @@ int main(void)
     {
         0, //SKIP CHECK
         0, //NO OUTPUT
-        0 //UPDATE
+        0, //UPDATE
+        WHY2_v4 //LATEST VERSION
     };
 
     //SET FLAGS
diff --git a/src/logger/app/main.c b/src/logger/app/main.c
index a87e3ff..1b5c0a5 100644
--- a/src/logger/app/main.c
+++ b/src/logger/app/main.c
@@ -15,7 +15,8 @@ int main(void)
         {
             1,
             1,
-            0
+            0,
+            WHY2_v4
         }
     );
 
diff --git a/src/logger/lib/logger.c b/src/logger/lib/logger.c
index 4722721..7d03717 100644
--- a/src/logger/lib/logger.c
+++ b/src/logger/lib/logger.c
@@ -135,7 +135,7 @@ void why2_write_log(int loggerFile, char *logMessage)
     why2_log_flags flags = why2_get_log_flags();
 
     //SET ENCRYPTER FLAGS
-    if (!why2_get_flags_changed()) why2_set_flags((why2_input_flags) { 0, 1, 0 });
+    if (!why2_get_flags_changed()) why2_set_flags((why2_input_flags) { 0, 1, 0, WHY2_v4 });
 
     if (flags.key != NULL) //ENCRYPT TEXT IF KEY WAS CHANGED
     {