diff --git a/plugins/dbgate-plugin-firebird/src/frontend/Dumper.js b/plugins/dbgate-plugin-firebird/src/frontend/Dumper.js
index 154361d0a..6478f2e85 100644
--- a/plugins/dbgate-plugin-firebird/src/frontend/Dumper.js
+++ b/plugins/dbgate-plugin-firebird/src/frontend/Dumper.js
@@ -4,6 +4,41 @@ class Dumper extends SqlDumper {
   autoIncrement() {
     this.put(' ^generated ^by ^default ^as ^identity');
   }
+
+  dropColumn(column) {
+    this.putCmd('^alter ^table %f ^drop %i', column, column.columnName);
+  }
+
+  renameColumn(column, newName) {
+    this.putCmd('^alter ^table %f ^alter ^column %i ^to %i', column, column.columnName, newName);
+  }
+
+  changeColumn(oldcol, newcol, constraints) {
+    if (oldcol.columnName != newcol.columnName) {
+      this.putCmd('^alter ^table %f ^alter ^column %i ^to %i', oldcol, oldcol.columnName, newcol.columnName);
+    }
+
+    if (oldcol.notNull != newcol.notNull) {
+      if (newcol.notNull) {
+        this.putCmd('^alter ^table %f ^alter ^column %i ^set ^not ^null', newcol, newcol.columnName);
+      } else {
+        this.putCmd('^alter ^table %f ^alter ^column %i ^drop ^not ^null', newcol, newcol.columnName);
+      }
+    }
+
+    if (oldcol.defaultValue != newcol.defaultValue) {
+      if (newcol.defaultValue) {
+        this.putCmd(
+          '^alter ^table %f ^alter ^column %i ^set ^default %s',
+          newcol,
+          newcol.columnName,
+          newcol.defaultValue
+        );
+      } else {
+        this.putCmd('^alter ^table %f ^alter ^column %i ^drop ^default', newcol, newcol.columnName);
+      }
+    }
+  }
 }
 
 module.exports = Dumper;