diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bd3b336d3..744f2128b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -123,7 +123,7 @@ jobs:
           - '8.12.2'
           - '8.13.4'
           - '8.14.3'
-          - '8.15.3'
+          - '8.15.5'
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
       - uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5
@@ -153,7 +153,7 @@ jobs:
 
       - id: setup-fleet
         name: Setup Fleet
-        if: matrix.version == '8.10.3' || matrix.version == '8.11.4' || matrix.version == '8.12.2' || matrix.version == '8.13.4' || matrix.version == '8.14.3' || matrix.version == '8.15.3'
+        if: matrix.version == '8.10.3' || matrix.version == '8.11.4' || matrix.version == '8.12.2' || matrix.version == '8.13.4' || matrix.version == '8.14.3' || matrix.version == '8.15.5'
         run: |-
           make setup-kibana-fleet
         env:
@@ -162,7 +162,7 @@ jobs:
 
       - id: force-install-synthetics
         name: Force install synthetics
-        if: matrix.version == '8.14.3' || matrix.version == '8.15.3'
+        if: matrix.version == '8.14.3' || matrix.version == '8.15.5'
         run: |-
           for i in {1..5}; do curl -s -H "Authorization: ApiKey ${{ steps.get-api-key.outputs.apikey }}" --header "Content-Type: application/json" --header "kbn-xsrf: true" --request POST --data '{ "force": true }' http://localhost:5601/api/fleet/epm/packages/synthetics/1.2.2 && break || sleep 15; done
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb09a17f5..ea7b859cd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 ## [Unreleased]
 
+- Support 8.15.5 in acc tests ([#963](https://github.com/elastic/terraform-provider-elasticstack/pull/963)).
+
 ## [0.11.12] - 2024-12-16
 
 ### Breaking changes
diff --git a/Makefile b/Makefile
index 0dbb5beb7..ed3330aea 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ SWAGGER_VERSION ?= 8.7
 
 GOVERSION ?= $(shell grep -e '^go' go.mod | cut -f 2 -d ' ')
 
-STACK_VERSION ?= 8.15.3
+STACK_VERSION ?= 8.15.5
 
 ELASTICSEARCH_NAME ?= terraform-elasticstack-es
 ELASTICSEARCH_ENDPOINTS ?= http://$(ELASTICSEARCH_NAME):9200