diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2eb11154d..a165ceb63 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -102,6 +102,7 @@ jobs:
           - '8.11.4'
           - '8.12.2'
           - '8.13.4'
+          - '8.14.0'
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a78cb7a2..980b5df81 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 - Populate policy_id when importing fleet policies and integrations ([#646](https://github.com/elastic/terraform-provider-elasticstack/pull/646))
 - Fix alerting rule update crash when backend responds with HTTP 4xx. ([#649](https://github.com/elastic/terraform-provider-elasticstack/pull/649))
+- Support allow_write_after_shrink when managing ILM policies ([#662](https://github.com/elastic/terraform-provider-elasticstack/pull/662))
 
 ## [0.11.3] - 2024-05-16
 
diff --git a/docs/resources/elasticsearch_index_lifecycle.md b/docs/resources/elasticsearch_index_lifecycle.md
index 380a54b2f..825876dd0 100644
--- a/docs/resources/elasticsearch_index_lifecycle.md
+++ b/docs/resources/elasticsearch_index_lifecycle.md
@@ -322,6 +322,7 @@ Required:
 
 Optional:
 
+- `allow_write_after_shrink` (Boolean) If true, the shrunken index is made writable by removing the write block.
 - `max_primary_shard_size` (String) The max primary shard size for the target index.
 - `number_of_shards` (Number) Number of shards to shrink to.
 
@@ -415,6 +416,7 @@ Required:
 
 Optional:
 
+- `allow_write_after_shrink` (Boolean) If true, the shrunken index is made writable by removing the write block.
 - `max_primary_shard_size` (String) The max primary shard size for the target index.
 - `number_of_shards` (Number) Number of shards to shrink to.
 
diff --git a/internal/elasticsearch/index/ilm.go b/internal/elasticsearch/index/ilm.go
index 4ee7b9ec7..536b41a8f 100644
--- a/internal/elasticsearch/index/ilm.go
+++ b/internal/elasticsearch/index/ilm.go
@@ -355,6 +355,11 @@ var supportedActions = map[string]*schema.Schema{
 					Type:        schema.TypeString,
 					Optional:    true,
 				},
+				"allow_write_after_shrink": {
+					Description: "If true, the shrunken index is made writable by removing the write block.",
+					Type:        schema.TypeBool,
+					Optional:    true,
+				},
 			},
 		},
 	},
@@ -530,7 +535,7 @@ func expandPhase(p map[string]interface{}, serverVersion *version.Version) (*mod
 			case "set_priority":
 				actions[actionName], diags = expandAction(a, serverVersion, "priority")
 			case "shrink":
-				actions[actionName], diags = expandAction(a, serverVersion, "number_of_shards", "max_primary_shard_size")
+				actions[actionName], diags = expandAction(a, serverVersion, "number_of_shards", "max_primary_shard_size", "allow_write_after_shrink")
 			case "unfollow":
 				if a[0] != nil {
 					ac := a[0].(map[string]interface{})
@@ -563,14 +568,15 @@ var ilmActionSettingOptions = map[string]struct {
 	def            interface{}
 	minVersion     *version.Version
 }{
-	"number_of_replicas":     {skipEmptyCheck: true},
-	"total_shards_per_node":  {skipEmptyCheck: true, def: -1, minVersion: version.Must(version.NewVersion("7.16.0"))},
-	"priority":               {skipEmptyCheck: true},
-	"min_age":                {def: "", minVersion: RolloverMinConditionsMinSupportedVersion},
-	"min_docs":               {def: 0, minVersion: RolloverMinConditionsMinSupportedVersion},
-	"min_size":               {def: "", minVersion: RolloverMinConditionsMinSupportedVersion},
-	"min_primary_shard_size": {def: "", minVersion: RolloverMinConditionsMinSupportedVersion},
-	"min_primary_shard_docs": {def: 0, minVersion: RolloverMinConditionsMinSupportedVersion},
+	"number_of_replicas":       {skipEmptyCheck: true},
+	"total_shards_per_node":    {skipEmptyCheck: true, def: -1, minVersion: version.Must(version.NewVersion("7.16.0"))},
+	"priority":                 {skipEmptyCheck: true},
+	"min_age":                  {def: "", minVersion: RolloverMinConditionsMinSupportedVersion},
+	"min_docs":                 {def: 0, minVersion: RolloverMinConditionsMinSupportedVersion},
+	"min_size":                 {def: "", minVersion: RolloverMinConditionsMinSupportedVersion},
+	"min_primary_shard_size":   {def: "", minVersion: RolloverMinConditionsMinSupportedVersion},
+	"min_primary_shard_docs":   {def: 0, minVersion: RolloverMinConditionsMinSupportedVersion},
+	"allow_write_after_shrink": {def: false, minVersion: version.Must(version.NewVersion("8.14.0"))},
 }
 
 func expandAction(a []interface{}, serverVersion *version.Version, settings ...string) (map[string]interface{}, diag.Diagnostics) {
diff --git a/internal/elasticsearch/index/ilm_test.go b/internal/elasticsearch/index/ilm_test.go
index 177da2195..ffd4f0d21 100644
--- a/internal/elasticsearch/index/ilm_test.go
+++ b/internal/elasticsearch/index/ilm_test.go
@@ -210,6 +210,9 @@ resource "elasticstack_elasticsearch_index_lifecycle" "test" {
       })
       number_of_replicas = 1
     }
+    shrink {
+      max_primary_shard_size = "50gb"
+    }
   }
 
 }