diff --git a/doc/utils/requirements.txt b/doc/utils/requirements.txt
index a7a03e6e41..be8aaed19c 100644
--- a/doc/utils/requirements.txt
+++ b/doc/utils/requirements.txt
@@ -1,4 +1,4 @@
-Sphinx < 7.0.0
+Sphinx < 6.0.0
 sphinxcontrib-spelling
 sphinxcontrib-jquery >=3.0.0
 git+https://github.com/akohlmey/sphinx-fortran@parallel-read
diff --git a/src/version.h b/src/version.h
index d37d757374..7c7b2a3840 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1 +1,2 @@
 #define LAMMPS_VERSION "28 Mar 2023"
+#define LAMMPS_UPDATE "Update 1"