diff --git a/changes/ticket40664 b/changes/ticket40664
new file mode 100644
index 0000000000..729b6ff02a
--- /dev/null
+++ b/changes/ticket40664
@@ -0,0 +1,3 @@
+  o Minor feature (authority):
+    - Reject 0.4.6.x series at the authority level. Closes ticket 40664.
+
diff --git a/src/feature/dirauth/process_descs.c b/src/feature/dirauth/process_descs.c
index 6a9cc5e95f..3cdace452f 100644
--- a/src/feature/dirauth/process_descs.c
+++ b/src/feature/dirauth/process_descs.c
@@ -412,6 +412,15 @@ dirserv_rejects_tor_version(const char *platform,
     return true;
   }
 
+  /* Reject 0.4.6.x series. */
+  if (tor_version_as_new_as(platform, "0.4.6.0") &&
+      !tor_version_as_new_as(platform, "0.4.7.0-alpha-dev")) {
+    if (msg) {
+      *msg = please_upgrade_string;
+    }
+    return true;
+  }
+
   return false;
 }
 
diff --git a/src/test/test_process_descs.c b/src/test/test_process_descs.c
index 1471bec18e..abcb6ae2fe 100644
--- a/src/test/test_process_descs.c
+++ b/src/test/test_process_descs.c
@@ -47,13 +47,21 @@ test_process_descs_versions(void *arg)
     { "Tor 0.4.3.0-alpha-dev", true },
     { "Tor 0.4.3.8", true },
     { "Tor 0.4.4.9", true },
+
+    /* The 0.4.5.x series stable is supported. */
     { "Tor 0.4.5.5-rc", true },
-    // new enough to be supported
     { "Tor 0.4.5.6", false },
-    { "Tor 0.4.6.0-alpha-dev", false },
-    { "Tor 0.4.6.5", false },
+    { "Tor 0.4.5.15", false },
+
+    { "Tor 0.4.6.0-alpha-dev", true },
+    { "Tor 0.4.6.1-alpha", true },
+    { "Tor 0.4.6.5", true },
+    { "Tor 0.4.6.50", true }, /* Non existing one in the 0.4.6 series */
+
     { "Tor 0.4.7.0-alpha-dev", false },
     { "Tor 0.4.7.3-alpha", false },
+    { "Tor 0.4.7.12", false },
+
     // Very far in the future
     { "Tor 100.100.1.5", false },
   };