diff --git a/prepro/requirements.txt b/prepro/requirements.txt
old mode 100755
new mode 100644
index adc1d46..194af57
--- a/prepro/requirements.txt
+++ b/prepro/requirements.txt
@@ -12,7 +12,7 @@ bz2file==0.98
 certifi==2018.10.15
 chardet==3.0.4
 command-not-found==0.3
-cryptography==2.1.4
+cryptography==3.2
 cupshelpers==1.0
 cycler==0.10.0
 defer==1.0.6