diff --git a/0001-Fix-tests-with-GNU-grep-3.8.patch b/0001-Fix-tests-with-GNU-grep-3.8.patch
new file mode 100644
index 0000000..561dcef
--- /dev/null
+++ b/0001-Fix-tests-with-GNU-grep-3.8.patch
@@ -0,0 +1,37 @@
+diff --git a/build-scripts/build-doc b/build-scripts/build-doc
+index 077f836..18f85ee 100755
+--- a/build-scripts/build-doc
++++ b/build-scripts/build-doc
+@@ -10,7 +10,7 @@ pip3 install sphinx sphinx_rtd_theme
+ ./configure --enable-doc-maintenance
+ make -j$(nproc) doc-dist DOC_DEST=doc
+ zip -r doc.zip doc
+-version=$(egrep '^release' manual/conf.py | cut -d"'" -f 2)
++version=$(grep -E '^release' manual/conf.py | cut -d"'" -f 2)
+ mv doc qpdf-${version}-doc
+ mkdir distribution
+ zip -r distribution/qpdf-${version}-doc.zip qpdf-${version}-doc
+diff --git a/qpdf/qtest/qpdf/diff-encrypted b/qpdf/qtest/qpdf/diff-encrypted
+index ac5428c..f6741c2 100755
+--- a/qpdf/qtest/qpdf/diff-encrypted
++++ b/qpdf/qtest/qpdf/diff-encrypted
+@@ -1,5 +1,5 @@
+ #!/bin/sh
+-lines=$(expr 0 + $(diff "$1" "$2" | egrep '^[<>]' | egrep -v '(Date|InstanceID)' | wc -l))
++lines=$(expr 0 + $(diff "$1" "$2" | grep -E '^[<>]' | grep -E -v '(Date|InstanceID)' | wc -l))
+ if [ "$lines" = "0" ]; then
+    echo okay
+ else
+diff --git a/qpdf/qtest/qpdf/diff-ignore-ID-version b/qpdf/qtest/qpdf/diff-ignore-ID-version
+index 72def44..de4c7c9 100755
+--- a/qpdf/qtest/qpdf/diff-ignore-ID-version
++++ b/qpdf/qtest/qpdf/diff-ignore-ID-version
+@@ -1,6 +1,6 @@
+ #!/bin/sh
+-lines=$(expr 0 + $(diff "$1" "$2" | egrep '^[<>]' | \
+-        egrep -v '/ID' | egrep -v '%PDF-' | wc -l))
++lines=$(expr 0 + $(diff "$1" "$2" | grep -E '^[<>]' | \
++        grep -E -v '/ID' | grep -E -v '%PDF-' | wc -l))
+ if [ "$lines" = "0" ]; then
+    echo okay
+ else
diff --git a/qpdf.spec b/qpdf.spec
index b319173..c2d7093 100644
--- a/qpdf.spec
+++ b/qpdf.spec
@@ -1,7 +1,7 @@
 Summary: Command-line tools and library for transforming PDF files
 Name:    qpdf
 Version: 10.6.3
-Release: 4%{?dist}
+Release: 5%{?dist}
 # MIT: e.g. libqpdf/sha2.c
 # upstream uses ASL 2.0 now, but he allowed other to distribute qpdf under
 # old license (see README)
@@ -15,6 +15,9 @@ Patch1:  qpdf-relax.patch
 # now we have s390x specific patch in zlib which changes output
 # so we need to disable one test because of it
 Patch2: qpdf-s390x-disable-streamtest.patch
+# egrep now shows warning, which causes test failure. Move to `grep -E`
+# https://github.com/qpdf/qpdf/commit/7049588bff21e3ea3e7bf3c4a4325c8ab4ed46f8
+Patch3: 0001-Fix-tests-with-GNU-grep-3.8.patch
 
 # gcc and gcc-c++ are no longer in buildroot by default
 # gcc is needed for qpdf-ctest.c
@@ -98,6 +101,7 @@ QPDF Manual
 %ifarch s390x
 %patch2 -p1 -b .s390x-disable-streamtest
 %endif
+%patch3 -p1 -b .use-grepe
 
 # unpack zip file with manual
 unzip %{SOURCE1}
@@ -153,6 +157,9 @@ make check
 
 
 %changelog
+* Thu Sep 22 2022 Zdenek Dohnal <zdohnal@redhat.com> - 10.6.3-5
+- use `grep -E` in test suite (bz2127957)
+
 * Mon Jul 25 2022 Zdenek Dohnal <zdohnal@redhat.com> - 10.6.3-4
 - qpdf doesn't depend on pcre since 7.0b1