diff --git a/version.rst b/version.rst
index 928a28e3..96f335a5 100644
--- a/version.rst
+++ b/version.rst
@@ -1,4 +1,5 @@
 .. SPDX-License-Identifier: MIT OR Apache-2.0
    SPDX-FileCopyrightText: The Ferrocene Developers
    SPDX-FileCopyrightText: The Rust Project Developers
-.. |spec_version| replace:: 1.90.0
+
+.. |spec_version| replace:: 1.91.0