diff --git a/README.adoc b/README.adoc
index f768cc13..b8c9ac42 100644
--- a/README.adoc
+++ b/README.adoc
@@ -38,14 +38,14 @@ The following requirements are needed by this module:
 
 The following providers are used by this module:
 
-- [[provider_kubernetes]] <<provider_kubernetes,kubernetes>> (>= 2)
-
 - [[provider_random]] <<provider_random,random>> (>= 3)
 
-- [[provider_utils]] <<provider_utils,utils>> (>= 1)
-
 - [[provider_argocd]] <<provider_argocd,argocd>> (>= 5)
 
+- [[provider_kubernetes]] <<provider_kubernetes,kubernetes>> (>= 2)
+
+- [[provider_utils]] <<provider_utils,utils>> (>= 1)
+
 - [[provider_null]] <<provider_null,null>> (>= 3)
 
 === Resources
@@ -120,7 +120,7 @@ Description: Override of target revision of the application chart.
 
 Type: `string`
 
-Default: `"v11.1.1"`
+Default: `"v12.0.0"`
 
 ==== [[input_cluster_issuer]] <<input_cluster_issuer,cluster_issuer>>
 
@@ -322,6 +322,14 @@ Type: `number`
 
 Default: `30`
 
+==== [[input_alertmanager_storage_size]] <<input_alertmanager_storage_size,alertmanager_storage_size>>
+
+Description: Default PVC size for Alertmanager data.
+
+Type: `string`
+
+Default: `"10Gi"`
+
 === Outputs
 
 The following outputs are exported:
@@ -358,9 +366,9 @@ Description: The admin password for Grafana.
 [cols="a,a",options="header,autowidth"]
 |===
 |Name |Version
-|[[provider_random]] <<provider_random,random>> |>= 3
 |[[provider_argocd]] <<provider_argocd,argocd>> |>= 5
 |[[provider_kubernetes]] <<provider_kubernetes,kubernetes>> |>= 2
+|[[provider_random]] <<provider_random,random>> |>= 3
 |[[provider_utils]] <<provider_utils,utils>> |>= 1
 |[[provider_null]] <<provider_null,null>> |>= 3
 |===
@@ -425,7 +433,7 @@ Description: The admin password for Grafana.
 |[[input_target_revision]] <<input_target_revision,target_revision>>
 |Override of target revision of the application chart.
 |`string`
-|`"v11.1.1"`
+|`"v12.0.0"`
 |no
 
 |[[input_cluster_issuer]] <<input_cluster_issuer,cluster_issuer>>
@@ -614,6 +622,12 @@ object({
 |`30`
 |no
 
+|[[input_alertmanager_storage_size]] <<input_alertmanager_storage_size,alertmanager_storage_size>>
+|Default PVC size for Alertmanager data.
+|`string`
+|`"10Gi"`
+|no
+
 |===
 
 = Outputs
diff --git a/aks/README.adoc b/aks/README.adoc
index 8c62d252..a3efd9e4 100644
--- a/aks/README.adoc
+++ b/aks/README.adoc
@@ -118,7 +118,7 @@ Description: Override of target revision of the application chart.
 
 Type: `string`
 
-Default: `"v11.1.1"`
+Default: `"v12.0.0"`
 
 ==== [[input_cluster_issuer]] <<input_cluster_issuer,cluster_issuer>>
 
@@ -320,6 +320,14 @@ Type: `number`
 
 Default: `30`
 
+==== [[input_alertmanager_storage_size]] <<input_alertmanager_storage_size,alertmanager_storage_size>>
+
+Description: Default PVC size for Alertmanager data.
+
+Type: `string`
+
+Default: `"10Gi"`
+
 === Outputs
 
 The following outputs are exported:
@@ -437,7 +445,7 @@ object({
 |[[input_target_revision]] <<input_target_revision,target_revision>>
 |Override of target revision of the application chart.
 |`string`
-|`"v11.1.1"`
+|`"v12.0.0"`
 |no
 
 |[[input_cluster_issuer]] <<input_cluster_issuer,cluster_issuer>>
@@ -626,6 +634,12 @@ object({
 |`30`
 |no
 
+|[[input_alertmanager_storage_size]] <<input_alertmanager_storage_size,alertmanager_storage_size>>
+|Default PVC size for Alertmanager data.
+|`string`
+|`"10Gi"`
+|no
+
 |===
 
 = Outputs
diff --git a/eks/README.adoc b/eks/README.adoc
index 3c7d27f5..4bab458c 100644
--- a/eks/README.adoc
+++ b/eks/README.adoc
@@ -118,7 +118,7 @@ Description: Override of target revision of the application chart.
 
 Type: `string`
 
-Default: `"v11.1.1"`
+Default: `"v12.0.0"`
 
 ==== [[input_cluster_issuer]] <<input_cluster_issuer,cluster_issuer>>
 
@@ -320,6 +320,14 @@ Type: `number`
 
 Default: `30`
 
+==== [[input_alertmanager_storage_size]] <<input_alertmanager_storage_size,alertmanager_storage_size>>
+
+Description: Default PVC size for Alertmanager data.
+
+Type: `string`
+
+Default: `"10Gi"`
+
 === Outputs
 
 The following outputs are exported:
@@ -433,7 +441,7 @@ object({
 |[[input_target_revision]] <<input_target_revision,target_revision>>
 |Override of target revision of the application chart.
 |`string`
-|`"v11.1.1"`
+|`"v12.0.0"`
 |no
 
 |[[input_cluster_issuer]] <<input_cluster_issuer,cluster_issuer>>
@@ -622,6 +630,12 @@ object({
 |`30`
 |no
 
+|[[input_alertmanager_storage_size]] <<input_alertmanager_storage_size,alertmanager_storage_size>>
+|Default PVC size for Alertmanager data.
+|`string`
+|`"10Gi"`
+|no
+
 |===
 
 = Outputs
diff --git a/kind/README.adoc b/kind/README.adoc
index 61761a7f..76042a45 100644
--- a/kind/README.adoc
+++ b/kind/README.adoc
@@ -99,7 +99,7 @@ Description: Override of target revision of the application chart.
 
 Type: `string`
 
-Default: `"v11.1.1"`
+Default: `"v12.0.0"`
 
 ==== [[input_cluster_issuer]] <<input_cluster_issuer,cluster_issuer>>
 
@@ -301,6 +301,14 @@ Type: `number`
 
 Default: `30`
 
+==== [[input_alertmanager_storage_size]] <<input_alertmanager_storage_size,alertmanager_storage_size>>
+
+Description: Default PVC size for Alertmanager data.
+
+Type: `string`
+
+Default: `"10Gi"`
+
 === Outputs
 
 The following outputs are exported:
@@ -396,7 +404,7 @@ object({
 |[[input_target_revision]] <<input_target_revision,target_revision>>
 |Override of target revision of the application chart.
 |`string`
-|`"v11.1.1"`
+|`"v12.0.0"`
 |no
 
 |[[input_cluster_issuer]] <<input_cluster_issuer,cluster_issuer>>
@@ -585,6 +593,12 @@ object({
 |`30`
 |no
 
+|[[input_alertmanager_storage_size]] <<input_alertmanager_storage_size,alertmanager_storage_size>>
+|Default PVC size for Alertmanager data.
+|`string`
+|`"10Gi"`
+|no
+
 |===
 
 = Outputs
diff --git a/locals.tf b/locals.tf
index b220d1ce..fb7a2a5c 100644
--- a/locals.tf
+++ b/locals.tf
@@ -169,6 +169,18 @@ locals {
             requests = { for k, v in var.resources.alertmanager.requests : k => v if v != null }
             limits   = { for k, v in var.resources.alertmanager.limits : k => v if v != null }
           }
+          storage = {
+            volumeClaimTemplate = {
+              spec = {
+                accessModes = ["ReadWriteOnce"]
+                resources = {
+                  requests = {
+                    storage = var.alertmanager_storage_size
+                  }
+                }
+              }
+            }
+          }
         }
         ingress = {
           enabled     = true
diff --git a/sks/README.adoc b/sks/README.adoc
index b52f1c02..957a7248 100644
--- a/sks/README.adoc
+++ b/sks/README.adoc
@@ -240,7 +240,7 @@ Description: Override of target revision of the application chart.
 
 Type: `string`
 
-Default: `"v11.1.1"`
+Default: `"v12.0.0"`
 
 ==== [[input_cluster_issuer]] <<input_cluster_issuer,cluster_issuer>>
 
@@ -442,6 +442,14 @@ Type: `number`
 
 Default: `30`
 
+==== [[input_alertmanager_storage_size]] <<input_alertmanager_storage_size,alertmanager_storage_size>>
+
+Description: Default PVC size for Alertmanager data.
+
+Type: `string`
+
+Default: `"10Gi"`
+
 === Outputs
 
 The following outputs are exported:
@@ -542,7 +550,7 @@ object({
 |[[input_target_revision]] <<input_target_revision,target_revision>>
 |Override of target revision of the application chart.
 |`string`
-|`"v11.1.1"`
+|`"v12.0.0"`
 |no
 
 |[[input_cluster_issuer]] <<input_cluster_issuer,cluster_issuer>>
@@ -731,6 +739,12 @@ object({
 |`30`
 |no
 
+|[[input_alertmanager_storage_size]] <<input_alertmanager_storage_size,alertmanager_storage_size>>
+|Default PVC size for Alertmanager data.
+|`string`
+|`"10Gi"`
+|no
+
 |===
 
 = Outputs
diff --git a/variables.tf b/variables.tf
index e3f0f621..b0524ae3 100644
--- a/variables.tf
+++ b/variables.tf
@@ -215,3 +215,9 @@ variable "dataproxy_timeout" {
   type        = number
   default     = 30
 }
+
+variable "alertmanager_storage_size" {
+  description = "Default PVC size for Alertmanager data."
+  type        = string
+  default     = "10Gi"
+}