diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9ae6003c032..2f2460d617b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Grafana Mimir
 
 * [BUGFIX] Fixed possible series matcher corruption leading to wrong series being included in query results. #6886
+* [ENHANCEMENT] Update Docker base images from `alpine:3.18.3` to `alpine:3.18.5`. #6897
 
 ### Documentation
 
diff --git a/cmd/metaconvert/Dockerfile b/cmd/metaconvert/Dockerfile
index a1fadcef2da..9d08f38f238 100644
--- a/cmd/metaconvert/Dockerfile
+++ b/cmd/metaconvert/Dockerfile
@@ -3,7 +3,7 @@
 # Provenance-includes-license: Apache-2.0
 # Provenance-includes-copyright: The Cortex Authors.
 
-FROM       alpine:3.18.3
+FROM       alpine:3.18.5
 ARG        EXTRA_PACKAGES
 RUN        apk add --no-cache ca-certificates tzdata $EXTRA_PACKAGES
 # Expose TARGETOS and TARGETARCH variables. These are supported by Docker when using BuildKit, but must be "enabled" using ARG.
diff --git a/cmd/mimir-continuous-test/Dockerfile b/cmd/mimir-continuous-test/Dockerfile
index 1b306e0f6d3..04c845739b2 100644
--- a/cmd/mimir-continuous-test/Dockerfile
+++ b/cmd/mimir-continuous-test/Dockerfile
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
-FROM       alpine:3.18.3
+FROM       alpine:3.18.5
 ARG        EXTRA_PACKAGES
 RUN        apk add --no-cache ca-certificates tzdata $EXTRA_PACKAGES
 # Expose TARGETOS and TARGETARCH variables. These are supported by Docker when using BuildKit, but must be "enabled" using ARG.
diff --git a/cmd/mimir/Dockerfile b/cmd/mimir/Dockerfile
index 1fd859ad802..8931329eb74 100644
--- a/cmd/mimir/Dockerfile
+++ b/cmd/mimir/Dockerfile
@@ -3,7 +3,7 @@
 # Provenance-includes-license: Apache-2.0
 # Provenance-includes-copyright: The Cortex Authors.
 
-FROM       alpine:3.18.3
+FROM       alpine:3.18.5
 ARG        EXTRA_PACKAGES
 RUN        apk add --no-cache ca-certificates tzdata $EXTRA_PACKAGES
 # Expose TARGETOS and TARGETARCH variables. These are supported by Docker when using BuildKit, but must be "enabled" using ARG.
diff --git a/cmd/mimirtool/Dockerfile b/cmd/mimirtool/Dockerfile
index 744dca165e5..d8747daaca1 100644
--- a/cmd/mimirtool/Dockerfile
+++ b/cmd/mimirtool/Dockerfile
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
-FROM       alpine:3.18.3
+FROM       alpine:3.18.5
 ARG        EXTRA_PACKAGES
 RUN        apk add --no-cache ca-certificates tzdata $EXTRA_PACKAGES
 # Expose TARGETOS and TARGETARCH variables. These are supported by Docker when using BuildKit, but must be "enabled" using ARG.
diff --git a/cmd/query-tee/Dockerfile b/cmd/query-tee/Dockerfile
index a26e018a1c8..78d6ce8fede 100644
--- a/cmd/query-tee/Dockerfile
+++ b/cmd/query-tee/Dockerfile
@@ -3,7 +3,7 @@
 # Provenance-includes-license: Apache-2.0
 # Provenance-includes-copyright: The Cortex Authors.
 
-FROM       alpine:3.18.3
+FROM       alpine:3.18.5
 ARG        EXTRA_PACKAGES
 RUN        apk add --no-cache ca-certificates tzdata $EXTRA_PACKAGES
 # Expose TARGETOS and TARGETARCH variables. These are supported by Docker when using BuildKit, but must be "enabled" using ARG.
diff --git a/development/mimir-microservices-mode/dev.dockerfile b/development/mimir-microservices-mode/dev.dockerfile
index dcab909e2de..d6b99f4d2f9 100644
--- a/development/mimir-microservices-mode/dev.dockerfile
+++ b/development/mimir-microservices-mode/dev.dockerfile
@@ -3,7 +3,7 @@ FROM $BUILD_IMAGE
 ENV CGO_ENABLED=0
 RUN go install github.com/go-delve/delve/cmd/dlv@v1.21.0
 
-FROM alpine:3.18.2
+FROM alpine:3.18.5
 
 RUN     mkdir /mimir
 WORKDIR /mimir
diff --git a/development/mimir-monolithic-mode-with-swift-storage/dev.dockerfile b/development/mimir-monolithic-mode-with-swift-storage/dev.dockerfile
index 0c63dca01a6..a70fcff6524 100644
--- a/development/mimir-monolithic-mode-with-swift-storage/dev.dockerfile
+++ b/development/mimir-monolithic-mode-with-swift-storage/dev.dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.18.2
+FROM alpine:3.18.5
 
 RUN     mkdir /mimir
 WORKDIR /mimir
diff --git a/development/mimir-monolithic-mode/dev.dockerfile b/development/mimir-monolithic-mode/dev.dockerfile
index ce710fc10b0..78bb6b87736 100644
--- a/development/mimir-monolithic-mode/dev.dockerfile
+++ b/development/mimir-monolithic-mode/dev.dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.18.3
+FROM alpine:3.18.5
 
 RUN     mkdir /mimir
 WORKDIR /mimir
diff --git a/development/mimir-read-write-mode/dev.dockerfile b/development/mimir-read-write-mode/dev.dockerfile
index dcab909e2de..d6b99f4d2f9 100644
--- a/development/mimir-read-write-mode/dev.dockerfile
+++ b/development/mimir-read-write-mode/dev.dockerfile
@@ -3,7 +3,7 @@ FROM $BUILD_IMAGE
 ENV CGO_ENABLED=0
 RUN go install github.com/go-delve/delve/cmd/dlv@v1.21.0
 
-FROM alpine:3.18.2
+FROM alpine:3.18.5
 
 RUN     mkdir /mimir
 WORKDIR /mimir