diff --git a/Source/Samples/CalloutSample/CalloutSample.Droid/packages.config b/Source/Samples/CalloutSample/CalloutSample.Droid/packages.config
old mode 100755
new mode 100644
index 95aaa17..beac795
--- a/Source/Samples/CalloutSample/CalloutSample.Droid/packages.config
+++ b/Source/Samples/CalloutSample/CalloutSample.Droid/packages.config
@@ -44,7 +44,7 @@
   <package id="System.Security.Cryptography.X509Certificates" version="4.3.2" targetFramework="monoandroid80" />
   <package id="System.Text.Encoding" version="4.3.0" targetFramework="monoandroid70" />
   <package id="System.Text.Encoding.Extensions" version="4.3.0" targetFramework="monoandroid70" />
-  <package id="System.Text.RegularExpressions" version="4.3.0" targetFramework="monoandroid70" />
+  <package id="System.Text.RegularExpressions" version="4.3.1" targetFramework="monoandroid70" />
   <package id="System.Threading" version="4.3.0" targetFramework="monoandroid70" />
   <package id="System.Threading.Tasks" version="4.3.0" targetFramework="monoandroid70" />
   <package id="System.Threading.Timer" version="4.3.0" targetFramework="monoandroid70" />