diff --git a/py3_requirements.txt b/py3_requirements.txt
index 9161a23..3651b54 100644
--- a/py3_requirements.txt
+++ b/py3_requirements.txt
@@ -34,7 +34,7 @@ ndg-httpsclient==0.4.0
 notebook==4.2.0
 numpy==1.11.0
 oauthlib==1.1.1
-openpyxl==2.3.5
+openpyxl==2.4.2
 pandas==0.18.1
 pandas-datareader==0.2.1
 pathlib2==2.1.0
diff --git a/py3_server_requirements.txt b/py3_server_requirements.txt
index c870d1e..2ebc779 100644
--- a/py3_server_requirements.txt
+++ b/py3_server_requirements.txt
@@ -46,7 +46,7 @@ notebook==4.2.0
 numpy==1.11.0
 oauthenticator==0.5.0
 oauthlib==1.1.1
-openpyxl==2.3.5
+openpyxl==2.4.2
 pamela==0.2.1
 pandas==0.18.1
 pandas-datareader==0.2.1
diff --git a/requirements.txt b/requirements.txt
index ec17770..53d514a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ ndg-httpsclient==0.4.0
 notebook==4.2.0
 numpy==1.11.0
 oauthlib==1.1.1
-openpyxl==2.3.5
+openpyxl==2.4.2
 pandas==0.18.1
 pandas-datareader==0.2.1
 pathlib2==2.1.0