diff --git a/nix.spec.in b/nix.spec.in
index 401a2dc8a..2447f13a8 100644
--- a/nix.spec.in
+++ b/nix.spec.in
@@ -1,3 +1,5 @@
+%undefine _hardened_build
+
 %global nixbld_user "nix-builder-"
 %global nixbld_group "nixbld"
 
diff --git a/release.nix b/release.nix
index ace0f9cc8..8d71cc841 100644
--- a/release.nix
+++ b/release.nix
@@ -171,8 +171,8 @@ let
       };
 
 
-    rpm_fedora21i386 = makeRPM_i686 (diskImageFuns: diskImageFuns.fedora21i386) [ "libsodium-devel" ];
-    rpm_fedora21x86_64 = makeRPM_x86_64 (diskImageFunsFun: diskImageFunsFun.fedora21x86_64) [ "libsodium-devel" ];
+    rpm_fedora25i386 = makeRPM_i686 (diskImageFuns: diskImageFuns.fedora25i386) [ "libsodium-devel" ];
+    rpm_fedora25x86_64 = makeRPM_x86_64 (diskImageFunsFun: diskImageFunsFun.fedora25x86_64) [ "libsodium-devel" ];
 
 
     deb_debian8i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.debian8i386) [ "libsodium-dev" ] [ "libsodium13" ];
@@ -256,8 +256,8 @@ let
           deb_debian8x86_64
           deb_ubuntu1504i386
           deb_ubuntu1504x86_64
-          rpm_fedora21i386
-          rpm_fedora21x86_64
+          rpm_fedora25i386
+          rpm_fedora25x86_64
           tests.remoteBuilds
           tests.nix-copy-closure
           tests.binaryTarball