diff --git a/HISTORY.md b/HISTORY.md
index c6c6c72..4e449e4 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -8,6 +8,10 @@
   and `append` were prepending. This was fixed (reversed behavior). If you
   counted on the broken behavior, please update your code (#453).
 
+### Bugfixes
+
+- Fixed minimal openpyxl dependency version to 2.6.0 (#457).
+
 ## 1.1.0 (2020-02-13)
 
 ### Deprecations
diff --git a/setup.py b/setup.py
index d6f474b..0985813 100755
--- a/setup.py
+++ b/setup.py
@@ -38,13 +38,13 @@ setup(
     ],
     python_requires='>=3.5',
     extras_require={
-        'all': ['markuppy', 'odfpy', 'openpyxl>=2.4.0', 'pandas', 'pyyaml', 'tabulate', 'xlrd', 'xlwt'],
+        'all': ['markuppy', 'odfpy', 'openpyxl>=2.6.0', 'pandas', 'pyyaml', 'tabulate', 'xlrd', 'xlwt'],
         'cli': ['tabulate'],
         'html': ['markuppy'],
         'ods': ['odfpy'],
         'pandas': ['pandas'],
         'xls': ['xlrd', 'xlwt'],
-        'xlsx': ['openpyxl>=2.4.0'],
+        'xlsx': ['openpyxl>=2.6.0'],
         'yaml': ['pyyaml'],
     },
 )
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 8d49fd2..b127f18 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -2,7 +2,7 @@ pytest
 pytest-cov
 MarkupPy
 odfpy
-openpyxl>=2.4.0
+openpyxl>=2.6.0
 pandas
 pyyaml
 tabulate