diff --git a/loki/Dockerfile b/loki/Dockerfile
index 53dac798d..0e9959c17 100644
--- a/loki/Dockerfile
+++ b/loki/Dockerfile
@@ -1,5 +1,5 @@
 FROM quay.io/cybozu/golang:1.20-jammy AS build
-ARG LOKI_VERSION=2.9.0
+ARG LOKI_VERSION=2.9.1
 
 WORKDIR /work
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
diff --git a/loki/TAG b/loki/TAG
index e2e7fd524..0d4b0476f 100644
--- a/loki/TAG
+++ b/loki/TAG
@@ -1 +1 @@
-2.9.0.1
+2.9.1.1
diff --git a/promtail/Dockerfile b/promtail/Dockerfile
index bb767c7bb..cf44b2cf2 100644
--- a/promtail/Dockerfile
+++ b/promtail/Dockerfile
@@ -1,5 +1,5 @@
 FROM quay.io/cybozu/golang:1.20-jammy AS build
-ARG LOKI_VERSION=2.9.0
+ARG LOKI_VERSION=2.9.1
 ARG SYSTEMD_VERSION=252
 
 WORKDIR /work
diff --git a/promtail/TAG b/promtail/TAG
index e2e7fd524..0d4b0476f 100644
--- a/promtail/TAG
+++ b/promtail/TAG
@@ -1 +1 @@
-2.9.0.1
+2.9.1.1