diff --git a/postgresql.spec b/postgresql.spec
index 1e3a914..e1f9b4e 100644
--- a/postgresql.spec
+++ b/postgresql.spec
@@ -81,12 +81,12 @@ Url: http://www.postgresql.org/
 %global setup_version 5.1
 
 %global service_name postgresql.service
-Source0: ftp://ftp.postgresql.org/pub/source/v%{version}/postgresql-%{version}.tar.bz2
+Source0: https://ftp.postgresql.org/pub/source/v%{version}/postgresql-%{version}.tar.bz2
 # The PDF file is generated by generate-pdf.sh, which see for comments
 Source1: postgresql-%{version}-US.pdf
 # generate-pdf.sh is not used during RPM build, but include for documentation
 Source2: generate-pdf.sh
-Source3: ftp://ftp.postgresql.org/pub/source/v%{prevversion}/postgresql-%{prevversion}.tar.bz2
+Source3: https://ftp.postgresql.org/pub/source/v%{prevversion}/postgresql-%{prevversion}.tar.bz2
 Source4: Makefile.regress
 Source9: postgresql.tmpfiles.d
 Source10: postgresql.pam
@@ -99,8 +99,8 @@ Source12: https://github.com/devexp-db/postgresql-setup/releases/download/v%{set
 # Those here are just to enforce packagers check that the tarball was downloaded
 # correctly.  Also, this allows us check that packagers-only tarballs do not
 # differ with publicly released ones.
-Source16: ftp://ftp.postgresql.org/pub/source/v%{version}/postgresql-%{version}.tar.bz2.sha256
-Source17: ftp://ftp.postgresql.org/pub/source/v%{prevversion}/postgresql-%{prevversion}.tar.bz2.sha256
+Source16: https://ftp.postgresql.org/pub/source/v%{version}/postgresql-%{version}.tar.bz2.sha256
+Source17: https://ftp.postgresql.org/pub/source/v%{prevversion}/postgresql-%{prevversion}.tar.bz2.sha256
 
 # Comments for these patches are in the patch files.
 Patch1: rpm-pgsql.patch