diff --git a/release.sh b/release.sh
index d783301cc7e5de895fa9d91733c9d5086e1f05ac..63e6e136803b5e69db6d23bbf1b6debfbb46ccd4 100755
--- a/release.sh
+++ b/release.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 #__version_info__ = ('0', '20', '0dev6')
-current=`grep -P "__version_info__ = \(\'\d+\', \'\d+\', \'\d+(\w*)\'\)" src/sakia/__init__.py | grep -oP "\'\d+\', \'\d+\', \'\d+(\w*)\'"`
+current=`grep -P "__version_info__ = \(\"\d+\", \"\d+\", \"\d+(\w*)\"\)" src/sakia/__init__.py | grep -oP "\"\d+\", \"\d+\", \"\d+(\w*)\""`
 echo "Current version: $current"
 
 if [[ $1 =~ ^[0-9]+.[0-9]+.[0-9]+[0-9A-Za-z]*$ ]]; then