diff --git a/src/main/resources/db/changelog/alter-signer-information-for-deletion.xml b/src/main/resources/db/changelog/alter-signer-information-for-deletion.xml
index 70ae0d52..981116ae 100644
--- a/src/main/resources/db/changelog/alter-signer-information-for-deletion.xml
+++ b/src/main/resources/db/changelog/alter-signer-information-for-deletion.xml
@@ -9,7 +9,7 @@
         <addColumn tableName="signer_information">
             <column name="deleted_at" type="DATETIME"/>
         </addColumn>
-        <dropNotNullConstraint tableName="signer_information" columnName="signature"/>
+        <dropNotNullConstraint tableName="signer_information" columnName="signature" columnDataType="VARCHAR(6000)" />
     </changeSet>
 
-</databaseChangeLog>
\ No newline at end of file
+</databaseChangeLog>