diff --git a/ci/requirements-optional-pip.txt b/ci/requirements-optional-pip.txt
index 2e1bf0ca22bcf..ad0eba32684a8 100644
--- a/ci/requirements-optional-pip.txt
+++ b/ci/requirements-optional-pip.txt
@@ -14,7 +14,7 @@ lxml
 matplotlib
 nbsphinx
 numexpr
-openpyxl=2.5.5
+openpyxl==2.5.5
 pyarrow
 pymysql
 tables