diff --git a/app/flatpak-builtins-add-remote.c b/app/flatpak-builtins-add-remote.c
index acd13aba..db56b9c5 100644
--- a/app/flatpak-builtins-add-remote.c
+++ b/app/flatpak-builtins-add-remote.c
@@ -220,6 +220,7 @@ load_options (const char *filename,
   char *str;
   gboolean nodeps;
   g_autoptr(GBytes) bytes = NULL;
+  g_autofree char *version = NULL;
 
   if (g_str_has_prefix (filename, "http:") ||
       g_str_has_prefix (filename, "https:"))
@@ -258,6 +259,14 @@ load_options (const char *filename,
       exit (1);
     }
 
+  version = g_key_file_get_string (keyfile, FLATPAK_REPO_GROUP,
+                                   FLATPAK_REPO_VERSION_KEY, NULL);
+  if (version != NULL && strcmp (version, "1") != 0)
+    {
+      g_printerr ("Invalid version %s, only 1 supported", version);
+      exit (1);
+    }
+
   str = g_key_file_get_string (keyfile, FLATPAK_REPO_GROUP,
                                FLATPAK_REPO_URL_KEY, NULL);
   if (str != NULL)
diff --git a/common/flatpak-dir.c b/common/flatpak-dir.c
index 3ee2d959..7ef9d9e1 100644
--- a/common/flatpak-dir.c
+++ b/common/flatpak-dir.c
@@ -6015,6 +6015,7 @@ parse_ref_file (GBytes *data,
   g_autofree char *title = NULL;
   g_autofree char *name = NULL;
   g_autofree char *branch = NULL;
+  g_autofree char *version = NULL;
   g_autoptr(GBytes) gpg_data = NULL;
   gboolean is_runtime = FALSE;
   char *str;
@@ -6033,6 +6034,11 @@ parse_ref_file (GBytes *data,
   if (!g_key_file_has_group (keyfile, FLATPAK_REF_GROUP))
     return flatpak_fail (error, "Invalid file format, no %s group", FLATPAK_REF_GROUP);
 
+  version = g_key_file_get_string (keyfile, FLATPAK_REF_GROUP,
+                                   FLATPAK_REF_VERSION_KEY, NULL);
+  if (version != NULL && strcmp (version, "1") != 0)
+    return flatpak_fail (error, "Invalid version %s, only 1 supported", version);
+
   url = g_key_file_get_string (keyfile, FLATPAK_REF_GROUP,
                                FLATPAK_REF_URL_KEY, NULL);
   if (url == NULL)
diff --git a/common/flatpak-dir.h b/common/flatpak-dir.h
index 61d7f380..e2c1a491 100644
--- a/common/flatpak-dir.h
+++ b/common/flatpak-dir.h
@@ -38,6 +38,7 @@ GType flatpak_dir_get_type (void);
 GType flatpak_deploy_get_type (void);
 
 #define FLATPAK_REF_GROUP "Flatpak Ref"
+#define FLATPAK_REF_VERSION_KEY "Version"
 #define FLATPAK_REF_URL_KEY "Url"
 #define FLATPAK_REF_RUNTIME_REPO_KEY "RuntimeRepo"
 #define FLATPAK_REF_TITLE_KEY "Title"
@@ -47,6 +48,7 @@ GType flatpak_deploy_get_type (void);
 #define FLATPAK_REF_BRANCH_KEY "Branch"
 
 #define FLATPAK_REPO_GROUP "Flatpak Repo"
+#define FLATPAK_REPO_VERSION_KEY "Version"
 #define FLATPAK_REPO_URL_KEY "Url"
 #define FLATPAK_REPO_TITLE_KEY "Title"
 #define FLATPAK_REPO_DEFAULT_BRANCH_KEY "DefaultBranch"