diff --git a/_service b/_service
index e41914a..c664817 100644
--- a/_service
+++ b/_service
@@ -2,8 +2,8 @@
   <service name="tar_scm" mode="disabled">
     <param name="url">https://github.com/ocaml/ocamlfind.git</param>
     <param name="scm">git</param>
-    <param name="versionformat">1.8.1</param>
-    <param name="revision">findlib-1.8.1</param>
+    <param name="versionformat">1.9.1</param>
+    <param name="revision">findlib-1.9.1</param>
     <param name="filename">ocaml-findlib</param>
   </service>
   <service name="recompress" mode="disabled">
diff --git a/findlib-1.8.1.tar.xz b/findlib-1.8.1.tar.xz
deleted file mode 100644
index 72e79e0..0000000
--- a/findlib-1.8.1.tar.xz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:a34d0412b8bf34e08155fa4cdb635066d91de569fd644d2e26c00ee4768d81e6
-size 161420
diff --git a/findlib-1.9.1.tar.xz b/findlib-1.9.1.tar.xz
new file mode 100644
index 0000000..7147c8d
--- /dev/null
+++ b/findlib-1.9.1.tar.xz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:116311a9a2aee7ff09e399f468bc9b1cecb5bc939f5c001529c035aba0b48a83
+size 169048
diff --git a/ocaml-findlib.changes b/ocaml-findlib.changes
index 206b1a6..2cc6ef5 100644
--- a/ocaml-findlib.changes
+++ b/ocaml-findlib.changes
@@ -2,6 +2,9 @@
 Fri Apr  9 09:09:09 UTC 2021 - ohering@suse.de
 
 - Require current ocaml-rpm-macros
+- Update to upstream version 1.9.1
+   Fix an incomaptibility with ocaml-4.13
+   Switch from m4 to sed
 
 -------------------------------------------------------------------
 Thu Feb 20 20:20:20 UTC 2020 - ohering@suse.de
diff --git a/ocaml-findlib.spec b/ocaml-findlib.spec
index 6e353ea..24b76cd 100644
--- a/ocaml-findlib.spec
+++ b/ocaml-findlib.spec
@@ -18,7 +18,7 @@
 
 
 Name:           ocaml-findlib
-Version:        1.8.1
+Version:        1.9.1
 Release:        0
 %{?ocaml_preserve_bytecode}
 Summary:        Objective CAML package manager and build helper
@@ -32,8 +32,6 @@ Requires:       ocaml-compiler-libs
 Requires:       ocaml-runtime
 #
 Provides:       ocamlfind = %{version}
-BuildRequires:  m4
-BuildRequires:  ncurses-devel
 BuildRequires:  ocaml
 BuildRequires:  ocaml-ocamldoc
 BuildRequires:  ocaml-rpm-macros >= 20210409
@@ -72,11 +70,11 @@ make all
 %if 0%{?suse_ocaml_native_compiler}
 make opt
 %endif
-rm -fv doc/guide-html/TIMESTAMP
 
 %install
 make install prefix=%{buildroot}
 rm -rfv %{buildroot}%{ocaml_standard_library}/ocamlbuild
+rm -rfv %{buildroot}%{ocaml_standard_library}/findlib/Makefile.packages
 %ocaml_create_file_list
 
 %files -f %{name}.files