diff --git a/.gitignore b/.gitignore
index d721205..bf027b4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 /v1.4.0.tar.gz
 /v1.5.0.tar.gz
 /v1.6.4.tar.gz
+/v1.6.5.tar.gz
diff --git a/cppo-1.6.5-string-capitalize.patch b/cppo-1.6.5-string-capitalize.patch
new file mode 100644
index 0000000..7a4fe1d
--- /dev/null
+++ b/cppo-1.6.5-string-capitalize.patch
@@ -0,0 +1,11 @@
+--- ./cppo-1.6.5/src/cppo_eval.ml.old	2019-04-29 18:27:54.177974043 +0100
++++ ./cppo-1.6.5/src/cppo_eval.ml	2019-04-29 18:28:01.770989363 +0100
+@@ -85,7 +85,7 @@
+ let trim_compact_and_capitalize_string s =
+   let buf = Buffer.create (String.length s) in
+   trim_and_compact buf s;
+-  String.capitalize (Buffer.contents buf)
++  String.capitalize_ascii (Buffer.contents buf)
+ 
+ let is_ident s =
+   let len = String.length s in
diff --git a/ocaml-cppo.spec b/ocaml-cppo.spec
index f573087..b841373 100644
--- a/ocaml-cppo.spec
+++ b/ocaml-cppo.spec
@@ -4,14 +4,17 @@
 %endif
 
 Name:           ocaml-cppo
-Version:        1.6.4
-Release:        5%{?dist}
+Version:        1.6.5
+Release:        1%{?dist}
 Summary:        Equivalent of the C preprocessor for OCaml programs
 
 License:        BSD
 URL:            http://mjambon.com/cppo.html
 Source0:        https://github.com/mjambon/cppo/archive/v%{version}.tar.gz
 
+# Replace deprecated function String.capitalize.
+Patch1:         cppo-1.6.5-string-capitalize.patch
+
 BuildRequires:  ocaml >= 3.10.0
 BuildRequires:  ocaml-findlib
 %if !%{opt}
@@ -39,6 +42,7 @@ to the robustness of cppo across OCaml versions.
 
 %prep
 %setup -q -n %{libname}-%{version}
+%patch1 -p2
 sed -i.add-debuginfo \
     's/ocamlopt/ocamlopt -g/;s/ocamlc \(-[co]\)/ocamlc -g \1/' \
     Makefile
@@ -68,7 +72,8 @@ make test
 
 
 %changelog
-* Mon Apr 29 2019 Richard W.M. Jones <rjones@redhat.com> - 1.6.4-5
+* Mon Apr 29 2019 Richard W.M. Jones <rjones@redhat.com> - 1.6.5-1
+- New upstream version 1.6.5.
 - OCaml 4.08.0 (beta 3) rebuild.
 
 * Fri Feb 01 2019 Fedora Release Engineering <releng@fedoraproject.org> - 1.6.4-4
diff --git a/sources b/sources
index c22b611..86239cb 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (v1.6.4.tar.gz) = 89c6df66d597d929be7532ad82f0206b028bdbd79a0b4b39451bce3fa5bd63a80dce931d575f69bd7066de829347498c736657dfe9610b20700a652b9b542a4d
+SHA512 (v1.6.5.tar.gz) = e7955d578c4d3d9b2a2c40691b39912ecaffe5173b90394552978836da79ae963ae202899525e366a599a35913373fd7ab584748d1fcbdc4e53a442b42603061