diff --git a/python-PyCBC.changes b/python-PyCBC.changes
index 38dfa10..54596b2 100644
--- a/python-PyCBC.changes
+++ b/python-PyCBC.changes
@@ -1,3 +1,11 @@
+-------------------------------------------------------------------
+Sat Feb  5 11:50:20 UTC 2022 - Atri Bhattacharya <badshah400@gmail.com>
+
+- Add Obsoletes: python-PyCBC <= 1.18.0 to PyCBC-utils package to
+  avoid conflicts during updates.
+- Disable builds for python <= 3.6 by requiring python-devel >=
+  3.7 in keeping with setup.py.
+
 -------------------------------------------------------------------
 Thu Jan 20 12:36:02 UTC 2022 - Atri Bhattacharya <badshah400@gmail.com>
 
diff --git a/python-PyCBC.spec b/python-PyCBC.spec
index eac034a..0589843 100644
--- a/python-PyCBC.spec
+++ b/python-PyCBC.spec
@@ -30,7 +30,7 @@ License:        GPL-3.0-or-later
 URL:            http://www.pycbc.org/
 Source0:        https://github.com/gwastro/pycbc/archive/v%{version}.tar.gz#/%{modname}-%{version}.tar.gz
 BuildRequires:  %{python_module Cython}
-BuildRequires:  %{python_module devel}
+BuildRequires:  %{python_module devel >= 3.7}
 BuildRequires:  %{python_module numpy-devel}
 BuildRequires:  %{python_module numpy}
 BuildRequires:  %{python_module setuptools}
@@ -90,7 +90,8 @@ of detected sources.
 
 %package -n %{modname}-utils
 Summary:        PyCBC utilities to analyze gravitational-wave data
-Requires:       python3-PyCBC
+Requires:       python3-PyCBC = %{version}
+Obsoletes:      python-%{modname} <= 1.18.0
 
 %description -n %{modname}-utils
 PyCBC is a software package used to explore astrophysical sources of