diff --git a/.gitignore b/.gitignore
index df9d038..3a96e38 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 /merlin-3.3.1.tar.gz
 /merlin-3.3.2.tar.gz
 /merlin-3.3.3.tar.gz
+/merlin-v3.3.4-preview1.tbz
diff --git a/ocaml-merlin.spec b/ocaml-merlin.spec
index 0aa870a..b050e95 100644
--- a/ocaml-merlin.spec
+++ b/ocaml-merlin.spec
@@ -1,14 +1,15 @@
 Name:           ocaml-merlin
-Version:        3.3.3
-Release:        2%{?dist}
+Version:        3.3.4
+Release:        0.1.preview1%{?dist}
 Summary:        Context sensitive completion for OCaml in Vim and Emacs
 
 %global libname %(echo %{name} | sed -e 's/^ocaml-//')
+%global tag v%{version}-preview1
 
 # The entire source is MIT except src/ocaml are QPL
 License:        MIT and QPL
 URL:            https://github.com/ocaml/%{libname}
-Source0:        https://github.com/ocaml/%{libname}/archive/v%{version}/%{libname}-%{version}.tar.gz
+Source0:        https://github.com/ocaml/%{libname}/releases/download/%{tag}/%{libname}-%{tag}.tbz
 
 BuildRequires:  ocaml
 BuildRequires:  ocaml-dune >= 1.8
@@ -48,7 +49,7 @@ much more.
 
 
 %prep
-%setup -q -n %{libname}-%{version}
+%setup -q -n %{libname}-%{tag}
 
 
 %build
@@ -82,6 +83,9 @@ rm -fr %{buildroot}%{_prefix}/doc
 %{vimfiles_root}/*/*
 
 %changelog
+* Tue Mar  3 2020 Robin Lee <cheeselee@fedoraproject.org> - 3.3.4-0.1.preview1
+- Update to 3.3.4-preview1, supports OCaml 4.10 (BZ#1799817, BZ#1809312)
+
 * Wed Jan 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 3.3.3-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild
 
diff --git a/sources b/sources
index 3e03c50..7ec164a 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (merlin-3.3.3.tar.gz) = b8b6a48d006d260be1b3a22b15b97520d05aae8d751dc9c7708b2992d94aa027ac456de1b97f6e70ac331906225b043d3a1858c1850ee0b4abeb093e7f72306b
+SHA512 (merlin-v3.3.4-preview1.tbz) = 87819eb37047aa826c290d9fa82906e90178959f27448941161969f1c931d7b40f9959934a87a4132f8c46b476126f564d304a174a6131e9f837d258abdabbc3