diff --git a/net-im/synapse/synapse-1.141.0.ebuild b/net-im/synapse/synapse-1.141.0-r1.ebuild
similarity index 97%
rename from net-im/synapse/synapse-1.141.0.ebuild
rename to net-im/synapse/synapse-1.141.0-r1.ebuild
index 89842d4697497..04bba2ae5df28 100644
--- a/net-im/synapse/synapse-1.141.0.ebuild
+++ b/net-im/synapse/synapse-1.141.0-r1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 2022-2025 Gentoo Authors
+# Copyright 2022-2026 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -236,6 +236,8 @@ KEYWORDS="amd64 ~arm64 ~ppc64"
 IUSE="postgres selinux systemd test"
 RESTRICT="!test? ( test )"
 
+# Fails to run with =prometheus-client-0.24, see upstream issue
+# https://github.com/element-hq/synapse/issues/19375
 RDEPEND="
 	acct-user/synapse
 	acct-group/synapse
@@ -254,7 +256,7 @@ RDEPEND="
 	dev-python/packaging[${PYTHON_USEDEP}]
 	dev-python/phonenumbers[${PYTHON_USEDEP}]
 	>=dev-python/pillow-10.0.1[${PYTHON_USEDEP},webp]
-	dev-python/prometheus-client[${PYTHON_USEDEP}]
+	<dev-python/prometheus-client-0.24[${PYTHON_USEDEP}]
 	dev-python/pyasn1-modules[${PYTHON_USEDEP}]
 	dev-python/pyasn1[${PYTHON_USEDEP}]
 	dev-python/pydantic[${PYTHON_USEDEP}]
diff --git a/net-im/synapse/synapse-1.142.1.ebuild b/net-im/synapse/synapse-1.142.1-r1.ebuild
similarity index 97%
rename from net-im/synapse/synapse-1.142.1.ebuild
rename to net-im/synapse/synapse-1.142.1-r1.ebuild
index bbc7f1031cccd..d8ff53b856a04 100644
--- a/net-im/synapse/synapse-1.142.1.ebuild
+++ b/net-im/synapse/synapse-1.142.1-r1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 2022-2025 Gentoo Authors
+# Copyright 2022-2026 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -230,6 +230,8 @@ KEYWORDS="~amd64 ~arm64 ~ppc64"
 IUSE="postgres selinux systemd test"
 RESTRICT="!test? ( test )"
 
+# Fails to run with =prometheus-client-0.24, see upstream issue
+# https://github.com/element-hq/synapse/issues/19375
 RDEPEND="
 	acct-user/synapse
 	acct-group/synapse
@@ -248,7 +250,7 @@ RDEPEND="
 	dev-python/packaging[${PYTHON_USEDEP}]
 	dev-python/phonenumbers[${PYTHON_USEDEP}]
 	>=dev-python/pillow-10.0.1[${PYTHON_USEDEP},webp]
-	dev-python/prometheus-client[${PYTHON_USEDEP}]
+	<dev-python/prometheus-client-0.24[${PYTHON_USEDEP}]
 	dev-python/pyasn1-modules[${PYTHON_USEDEP}]
 	dev-python/pyasn1[${PYTHON_USEDEP}]
 	dev-python/pydantic[${PYTHON_USEDEP}]
diff --git a/net-im/synapse/synapse-1.143.0.ebuild b/net-im/synapse/synapse-1.143.0-r1.ebuild
similarity index 97%
rename from net-im/synapse/synapse-1.143.0.ebuild
rename to net-im/synapse/synapse-1.143.0-r1.ebuild
index 8a15e36f10416..9f95ffed7d642 100644
--- a/net-im/synapse/synapse-1.143.0.ebuild
+++ b/net-im/synapse/synapse-1.143.0-r1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 2022-2025 Gentoo Authors
+# Copyright 2022-2026 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -230,6 +230,8 @@ KEYWORDS="~amd64 ~arm64 ~ppc64"
 IUSE="postgres selinux systemd test"
 RESTRICT="!test? ( test )"
 
+# Fails to run with =prometheus-client-0.24, see upstream issue
+# https://github.com/element-hq/synapse/issues/19375
 RDEPEND="
 	acct-user/synapse
 	acct-group/synapse
@@ -248,7 +250,7 @@ RDEPEND="
 	dev-python/packaging[${PYTHON_USEDEP}]
 	dev-python/phonenumbers[${PYTHON_USEDEP}]
 	>=dev-python/pillow-10.0.1[${PYTHON_USEDEP},webp]
-	dev-python/prometheus-client[${PYTHON_USEDEP}]
+	<dev-python/prometheus-client-0.24[${PYTHON_USEDEP}]
 	dev-python/pyasn1-modules[${PYTHON_USEDEP}]
 	dev-python/pyasn1[${PYTHON_USEDEP}]
 	dev-python/pydantic[${PYTHON_USEDEP}]
diff --git a/net-im/synapse/synapse-1.144.0.ebuild b/net-im/synapse/synapse-1.144.0-r1.ebuild
similarity index 97%
rename from net-im/synapse/synapse-1.144.0.ebuild
rename to net-im/synapse/synapse-1.144.0-r1.ebuild
index bbcd554909ff7..d7c455185d775 100644
--- a/net-im/synapse/synapse-1.144.0.ebuild
+++ b/net-im/synapse/synapse-1.144.0-r1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 2022-2025 Gentoo Authors
+# Copyright 2022-2026 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -230,6 +230,8 @@ KEYWORDS="~amd64 ~arm64 ~ppc64"
 IUSE="postgres selinux systemd test"
 RESTRICT="!test? ( test )"
 
+# Fails to run with =prometheus-client-0.24, see upstream issue
+# https://github.com/element-hq/synapse/issues/19375
 RDEPEND="
 	acct-user/synapse
 	acct-group/synapse
@@ -248,7 +250,7 @@ RDEPEND="
 	dev-python/packaging[${PYTHON_USEDEP}]
 	dev-python/phonenumbers[${PYTHON_USEDEP}]
 	>=dev-python/pillow-10.0.1[${PYTHON_USEDEP},webp]
-	dev-python/prometheus-client[${PYTHON_USEDEP}]
+	<dev-python/prometheus-client-0.24[${PYTHON_USEDEP}]
 	dev-python/pyasn1-modules[${PYTHON_USEDEP}]
 	dev-python/pyasn1[${PYTHON_USEDEP}]
 	dev-python/pydantic[${PYTHON_USEDEP}]