diff --git a/curl.spec b/curl.spec
index c89ee42..44cb16c 100644
--- a/curl.spec
+++ b/curl.spec
@@ -1,7 +1,7 @@
 Summary: A utility for getting files from remote servers (FTP, HTTP, and others)
 Name: curl
 Version: 7.76.1
-Release: 42%{?dist}
+Release: 43%{?dist}
 License: MIT
 Source: https://curl.se/download/%{name}-%{version}.tar.xz
 
@@ -383,6 +383,12 @@ printf "702\n703\n716\n" >> tests/data/DISABLED
 printf "2034\n2037\n2041\n" >> tests/data/DISABLED
 %endif
 
+# disable proxy-related tests on ppc64le that fail in Konflux hermetic builds
+# due to test server race conditions (Address already in use, Connection refused)
+%ifarch ppc64le
+printf "1630\n1631\n1632\n1904\n2050\n2055\n" >> tests/data/DISABLED
+%endif
+
 # adapt test 323 for updated OpenSSL
 sed -e 's|^35$|35,52|' -i tests/data/test323
 
@@ -577,6 +583,9 @@ rm -f ${RPM_BUILD_ROOT}%{_libdir}/libcurl.la
 %{_libdir}/libcurl.so.4.[0-9].[0-9].minimal
 
 %changelog
+* Thu May 07 2026 Jacek Migacz <jmigacz@redhat.com> - 7.76.1-43
+- tests: disable flaky proxy tests on ppc64le in Konflux builds (RHEL-173187)
+
 * Tue Mar 31 2026 Veronika Kabatova <vkabatov@redhat.com> - 7.76.1-42
 - Rebuild to fix missing binaries due to buildsystem oversight