diff --git a/gnuplot.spec b/gnuplot.spec
index 8984c02..6916783 100644
--- a/gnuplot.spec
+++ b/gnuplot.spec
@@ -19,7 +19,7 @@ License: gnuplot and MIT
 URL: http://www.gnuplot.info/
 # Need to remove non-free lena files
 # rm -rf demo/lena*
-# Source: http://downloads.sourceforge.net/%{name}/%{name}-%{version}.tar.gz
+# Source0: https://downloads.sourceforge.net/%{name}/%{name}-%{version}.tar.gz
 Source0: %{name}-%{version}-clean.tar.gz
 Source1: gnuplot-init.el
 
diff --git a/sources b/sources
index e2e553c..7ad45e8 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (gnuplot-5.2.4-clean.tar.gz) = 1fbcab4c04f1a8d0632cc3a4bb91144363f50a61ebfe78ddb21f0331a11b7feb3447144f3abfad6ac58df9b4517748faa26840cf6903d023a80d32735ceb1e5b
+SHA512 (gnuplot-5.2.4-clean.tar.gz) = 9c5b556e2b0d3dc0c1a38a18053cbe5e187ca311d9bd0df446f99cff18b187241969e8b9dffd3863b5a311e2fd13018a86b9cdfde53f2623fce78311b6d9745d