diff --git a/README.md b/README.md
index 10278a40..a6c890e5 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 </h4>
 
 <div align="center">
-  <a href="https://badge.fury.io/py/pyequilib"><img src="https://badge.fury.io/py/pyequilib.svg" alt="PyPI version" height="18"></a>
+  <a href="https://badge.fury.io/py/pyequilib"><img src="https://badge.fury.io/py/pyequilib.svg" alt="PyPI version"></a>
   <a href="https://pypi.org/project/equilib"><img src="https://img.shields.io/pypi/pyversions/pyequilib"></a>
   <a href="https://github.com/haruishi43/equilib/actions"><img src="https://github.com/haruishi43/equilib/workflows/ci/badge.svg"></a>
   <a href="https://github.com/haruishi43/equilib/blob/master/LICENSE"><img alt="GitHub license" src="https://img.shields.io/github/license/haruishi43/equilib"></a>