diff --git a/workshop.json b/workshop.json
index 9a7cc16..96ee261 100644
--- a/workshop.json
+++ b/workshop.json
@@ -34,7 +34,7 @@
             "name": "bison_src",
             "type": "source",
             "source_info": {
-                "url": "https://ftp.gnu.org/gnu/bison/bison-3.8.2.tar.xz",
+                "url": "https://ftpmirror.gnu.org/gnu/bison/bison-3.8.2.tar.xz",
                 "filename": "bison.tar.xz",
                 "commands": {
                     "unpack": "tar -xf bison.tar.xz",
@@ -52,7 +52,7 @@
             "name": "gettext_src",
             "type": "source",
             "source_info": {
-                "url": "https://ftp.gnu.org/pub/gnu/gettext/gettext-0.22.4.tar.xz",
+                "url": "https://ftpmirror.gnu.org/gnu/gettext/gettext-0.22.4.tar.xz",
                 "filename": "gettext.tar.xz",
                 "commands": {
                     "unpack": "tar -xf gettext.tar.xz",