diff --git a/argocd/manifests/loki/loki-config.yaml b/argocd/manifests/loki/loki-config.yaml
index 5210f1b..41aac8e 100644
--- a/argocd/manifests/loki/loki-config.yaml
+++ b/argocd/manifests/loki/loki-config.yaml
@@ -40,7 +40,7 @@ storage_config:
     cache_location: /loki/tsdb-cache
 
 limits_config:
-  retention_period: 744h  # 31 days
+  retention_period: 8760h  # 365 days
 
 compactor:
   working_directory: /loki/compactor
diff --git a/argocd/manifests/loki/statefulset.yaml b/argocd/manifests/loki/statefulset.yaml
index eb4fe3b..18a6302 100644
--- a/argocd/manifests/loki/statefulset.yaml
+++ b/argocd/manifests/loki/statefulset.yaml
@@ -63,4 +63,4 @@ spec:
         accessModes: ["ReadWriteOnce"]
         resources:
           requests:
-            storage: 20Gi
+            storage: 50Gi
diff --git a/argocd/manifests/prometheus/statefulset.yaml b/argocd/manifests/prometheus/statefulset.yaml
index c549368..1d90038 100644
--- a/argocd/manifests/prometheus/statefulset.yaml
+++ b/argocd/manifests/prometheus/statefulset.yaml
@@ -24,7 +24,7 @@ spec:
           args:
             - --config.file=/etc/prometheus/prometheus.yml
             - --storage.tsdb.path=/prometheus
-            - --storage.tsdb.retention.time=15d
+            - --storage.tsdb.retention.time=3650d
             - --web.enable-remote-write-receiver
             - --web.enable-lifecycle
           ports:
@@ -65,4 +65,4 @@ spec:
         accessModes: ["ReadWriteOnce"]
         resources:
           requests:
-            storage: 20Gi
+            storage: 200Gi
diff --git a/docs/changelog.d/+increase-retention.infra.md b/docs/changelog.d/+increase-retention.infra.md
new file mode 100644
index 0000000..066e65c
--- /dev/null
+++ b/docs/changelog.d/+increase-retention.infra.md
@@ -0,0 +1 @@
+Increase data retention: Prometheus 15d → 10y (200Gi), Loki 31d → 365d (50Gi)