diff --git a/AUTHORS.md b/AUTHORS.md
index dbe59cff9..54e2e97a6 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -27,3 +27,4 @@ SMT has been developed thanks to contributions from:
 * Ruben Conde
 * Steven Berguin
 * Vincent Drouet
+* Zhou Tianxun
diff --git a/smt/__init__.py b/smt/__init__.py
index c68196d1c..67bc602ab 100644
--- a/smt/__init__.py
+++ b/smt/__init__.py
@@ -1 +1 @@
-__version__ = "1.2.0"
+__version__ = "1.3.0"
diff --git a/smt/problems/wing_weight.py b/smt/problems/wing_weight.py
index 63f9cd370..ad6b78b7e 100644
--- a/smt/problems/wing_weight.py
+++ b/smt/problems/wing_weight.py
@@ -62,11 +62,11 @@ def wraps(x):
         def func(x0, x1, x2, x3, x4, x5, x6, x7, x8, x9):
             return (
                 0.036
-                * x0 ** 0.758
-                * x1 ** 0.0035
-                * (x2 / np.cos(deg2rad(x3)) ** 2)**(0.6)
-                * x4 ** 0.006
-                * x5 ** 0.04
+                * x0**0.758
+                * x1**0.0035
+                * (x2 / np.cos(deg2rad(x3)) ** 2) ** (0.6)
+                * x4**0.006
+                * x5**0.04
                 * (100 * x6 / np.cos(deg2rad(x3))) ** (-0.3)
                 * (x7 * x8) ** 0.49
                 + x0 * x9