diff --git a/debian/changelog b/debian/changelog
index d68f0c64..205c4946 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,10 @@
+llvm-toolchain-snapshot (1:18~++20230921012857+4cf8da94198d-1~exp1) UNRELEASED; urgency=medium
+
+  * replace python3-recommonmark by myst-parser
+    to follow upstream change b7ff03206d668cd5a620a9d4e1b22ea112ed56e3
+
+ -- Sylvestre Ledru <sylvestre@debian.org>  Mon, 25 Sep 2023 21:51:52 +0200
+
 llvm-toolchain-snapshot (1:18~++20230910052457+7560356a832f-1~exp1) experimental; urgency=medium
 
   * New snapshot release
diff --git a/debian/control b/debian/control
index b14a766a..e3b3fb3f 100644
--- a/debian/control
+++ b/debian/control
@@ -16,7 +16,7 @@ Build-Depends: debhelper (>= 10.0), cmake, ninja-build,
     lcov, procps, help2man,
     zlib1g-dev, libzstd-dev,
     g++-multilib [amd64 i386 kfreebsd-amd64 mips64 mips64el mipsel powerpc ppc64 s390 s390x sparc sparc64 x32],
-    libjs-mathjax, python3-recommonmark,
+    libjs-mathjax, python3-myst-parser,
     doxygen,
     ocaml-base [amd64 arm64 armhf ppc64el riscv64 s390x] | ocaml-nox [amd64 arm64 armhf ppc64el riscv64 s390x],
     ocaml-findlib [amd64 arm64 armhf ppc64el riscv64 s390x],
diff --git a/debian/control.in b/debian/control.in
index c070c942..3955b171 100644
--- a/debian/control.in
+++ b/debian/control.in
@@ -16,7 +16,7 @@ Build-Depends: debhelper (>= 10.0), cmake, ninja-build,
     lcov, procps, help2man,
     zlib1g-dev, libzstd-dev,
     g++-multilib [amd64 i386 kfreebsd-amd64 mips64 mips64el mipsel powerpc ppc64 s390 s390x sparc sparc64 x32],
-    libjs-mathjax, python3-recommonmark,
+    libjs-mathjax, python3-myst-parser,
     doxygen,
     ocaml-base [amd64 arm64 armhf ppc64el riscv64 s390x] | ocaml-nox [amd64 arm64 armhf ppc64el riscv64 s390x],
     ocaml-findlib [amd64 arm64 armhf ppc64el riscv64 s390x],