diff --git a/hera_corr_f/control_software/casperfpga/requirements.txt b/hera_corr_f/control_software/casperfpga/requirements.txt
index d4c873b..8622958 100644
--- a/hera_corr_f/control_software/casperfpga/requirements.txt
+++ b/hera_corr_f/control_software/casperfpga/requirements.txt
@@ -1,6 +1,6 @@
 alabaster==0.7.10
 argh==0.26.2
-Babel==2.5.1
+Babel==2.9.1
 backports-abc==0.5
 backports.shutil-get-terminal-size==1.0.0
 certifi==2017.7.27.1