TAR_FILE=$(PACKAGE)-$(VERSION).tar.gz
 ELPA_FILE:=$(PACKAGE)-emacs-$(ELPA_VERSION).tar
 DEB_TAR_FILE=$(PACKAGE)_$(VERSION).orig.tar.gz
-SHA1_FILE=$(TAR_FILE).sha1
-GPG_FILE=$(SHA1_FILE).asc
+SHA256_FILE=$(TAR_FILE).sha256
+GPG_FILE=$(SHA256_FILE).asc
 
 PV_FILE=bindings/python/notmuch/version.py
 
 
        gzip < $(TAR_FILE).tmp > $(TAR_FILE)
        @echo "Source is ready for release in $(TAR_FILE)"
 
-$(SHA1_FILE): $(TAR_FILE)
-       sha1sum $^ > $@
+$(SHA256_FILE): $(TAR_FILE)
+       sha256sum $^ > $@
 
-$(GPG_FILE): $(SHA1_FILE)
-       @echo "Please enter your GPG password to sign the checksum."
-       gpg --armor --sign $^ 
+$(GPG_FILE): $(SHA256_FILE)
+       gpg --armor --sign $^
 
 .PHONY: dist
 dist: $(TAR_FILE)