diff --git a/ocaml-lwt.spec b/ocaml-lwt.spec
index 952cd34..d81db24 100644
--- a/ocaml-lwt.spec
+++ b/ocaml-lwt.spec
@@ -1,6 +1,6 @@
 Name:           ocaml-lwt
-Version:        5.2.0
-Release:        3%{?dist}
+Version:        5.3.0
+Release:        1%{?dist}
 Summary:        OCaml lightweight thread library
 
 # The openssl linking exception is granted.
@@ -26,9 +26,8 @@ BuildRequires:  ocaml-ocplib-endian-devel
 BuildRequires:  ocaml-react-devel
 
 # lwt_ppx dependencies.
-BuildRequires:  ocaml-ppx-tools-versioned-devel >= 5.2.3
+BuildRequires:  ocaml-ppx-tools-versioned-devel >= 5.3.0
 
-#BuildRequires:  chrpath
 BuildRequires:  glib2-devel
 BuildRequires:  libev-devel
 
@@ -40,9 +39,9 @@ is part of the Ocsigen project.
 %package        devel
 Summary:        Development files for %{name}
 Requires:       %{name}%{?_isa} = %{version}-%{release}
-# This is probably a packaging or dependency bug, but if we don't
-# have it then any package that builds using LWT fails with:
-# ocamlfind: Package `seq' not found - required by `lwt'
+Requires:       ocaml-mmap-devel
+Requires:       ocaml-ocplib-endian-devel%{?_isa}
+Requires:       ocaml-result-devel%{?_isa}
 Requires:       ocaml-seq-devel%{?_isa}
 Requires:       libev-devel%{?_isa}
 
@@ -88,14 +87,6 @@ developing applications that use %{name}-ppx.
 %prep
 %autosetup -n lwt-%{version}
 
-# Enable libev and pthread.
-sed 's/-use-libev false/-use-libev true -use-pthread true/g' -i Makefile
-
-# Remove '-dev' from the jbuilder command line.
-# This stops 'ambiguous documentation comment' from being a fatal error.
-sed 's/build --dev/build/g' -i Makefile
-sed 's/runtest --dev/runtest/g' -i Makefile
-
 # It looks like one test fails.
 # Actually, it looks like all the "mcast" tests fail in koji.
 # They should probably be disabled via a patch, but this works for now.
@@ -104,12 +95,10 @@ sed 's,test_mcast "mcast-join-noloop" true false;,(*test_mcast "mcast-join-noloo
 sed 's,test_mcast "mcast-nojoin-loop" false true;,(*test_mcast "mcast-nojoin-loop" false true;*),' -i test/unix/test_mcast.ml
 sed 's,test_mcast "mcast-nojoin-noloop" false false;,(*test_mcast "mcast-nojoin-noloop" false false;*),' -i test/unix/test_mcast.ml
 
-# Some lwt.unix tests fail because we can't seem to look up the
-# user/group name from inside koji. I guess that makes sense?
-# Those tests have guards not to run on win32; we can hack them to not run here either.
-sed 's,Sys.win32 && not is_wsl,Sys.unix,g' -i test/unix/test_lwt_unix.cppo.ml
-
 %build
+# Enable libev and pthread.
+dune exec src/unix/config/discover.exe -- --save \
+     --use-libev true --use-pthread true
 dune build --profile=release --verbose
 
 # Relink the stublib with RPM_LD_FLAGS
@@ -121,9 +110,7 @@ cd -
 %install
 dune install --profile=release --destdir %{buildroot}
 
-#chrpath --delete $OCAMLFIND_DESTDIR/stublibs/dll*.so
-
-# Remove spurious jbuilder-installed documentation.
+# Remove spurious dune-installed documentation.
 rm -rf %{buildroot}/%{_prefix}/doc
 
 %ifarch %{ocaml_native_compiler}
@@ -227,6 +214,9 @@ dune runtest --profile=release
 
 
 %changelog
+* Mon Jun 15 2020 Jerry James <loganjerry@gmail.com> - 5.3.0-1
+- New upstream version 5.3.0
+
 * Tue May 05 2020 Richard W.M. Jones <rjones@redhat.com> - 5.2.0-3
 - OCaml 4.11.0+dev2-2020-04-22 rebuild
 
diff --git a/sources b/sources
index 69a69de..dfebe3f 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (lwt-5.2.0.tar.gz) = 361019d128bd2924cfa3251a5d8929b0ba85fc519c4c987ab0e3e2023dfc06cf376146941546abd2c03b6999bce0abf0de342507c1ac9674c2915b3b6f280707
+SHA512 (lwt-5.3.0.tar.gz) = 9922c19944595b0c07da8e1bbdecb2cc7c5a7edcdc2224215efb819d9c735da8986388a2446bd0762e28533f5d9d386970f07a4f1b0d14255c6743f3a1d16cb6