diff --git a/alembic.spec b/alembic.spec
index e11f832..f1f94c2 100644
--- a/alembic.spec
+++ b/alembic.spec
@@ -3,7 +3,7 @@
 
 Name:           alembic
 Version:        1.7.8
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Open framework for storing and sharing scene data
 License:        BSD
 URL:            http://alembic.io/
@@ -13,7 +13,10 @@ Source0:        https://github.com/%{name}/%{name}/archive/%{version}.tar.gz#/%{
 BuildRequires:  cmake
 BuildRequires:	gcc-c++
 BuildRequires:  hdf5-devel
-BuildRequires:  OpenEXR-devel
+# Per https://github.com/alembic/alembic/blob/master/README.txt
+# alembic actually needs ilmbase, not OpenEXR.
+#BuildRequires:  OpenEXR-devel
+BuildRequires:  ilmbase-devel
 BuildRequires:  zlib-devel
 
 %description
@@ -98,6 +101,9 @@ popd
 %{_libdir}/libAlembic.so
 
 %changelog
+* Thu Apr 11 2019 Richard Shaw <hobbes1069@gmail.com> - 1.7.8-4
+- Rebuild for Ilmbase 2.3.0.
+
 * Sat Mar 16 2019 Orion Poplawski <orion@nwra.com> - 1.7.8-3
 - Rebuild for hdf5 1.10.5