diff --git a/base/README.md b/base/README.md
index 9a2a24368..670f7eaa0 100644
--- a/base/README.md
+++ b/base/README.md
@@ -1,7 +1,7 @@
 The LaTeX kernel
 ================
 
-Release 2021-05-01 pre-release 0
+Release 2021-05-01 pre-release 1
 
 Overview
 --------
diff --git a/base/ltvers.dtx b/base/ltvers.dtx
index 570c2303b..df57faf23 100644
--- a/base/ltvers.dtx
+++ b/base/ltvers.dtx
@@ -115,7 +115,7 @@
    {2021-05-01}
 %</2ekernel|latexrelease>
 %<*2ekernel>
-\def\patch@level{-0}
+\def\patch@level{-1}
 %    \end{macrocode}
 %
 % \begin{macro}{\development@branch@name}