diff --git a/helm/reana/Chart.yaml b/helm/reana/Chart.yaml
index 1d6d6f98..2a59559b 100644
--- a/helm/reana/Chart.yaml
+++ b/helm/reana/Chart.yaml
@@ -27,7 +27,7 @@ keywords:
   - reusable-science
 type: application
 # Chart version.
-version: 0.9.1-alpha.3
+version: 0.9.1-alpha.4
 kubeVersion: ">= 1.21.0-0 < 1.28.0-0"
 dependencies:
   - name: traefik
diff --git a/helm/reana/values.yaml b/helm/reana/values.yaml
index 6cccfed5..9e879bd0 100644
--- a/helm/reana/values.yaml
+++ b/helm/reana/values.yaml
@@ -77,12 +77,12 @@ components:
     forum_url: https://forum.reana.io
     file_preview_size_limit: 5242880  # 5 * 1024**2 = 5 MiB
     imagePullPolicy: IfNotPresent
-    image: docker.io/reanahub/reana-ui:0.9.1-alpha.3
+    image: docker.io/reanahub/reana-ui:0.9.1-alpha.4
   reana_db:
     enabled: true
   reana_server:
     imagePullPolicy: IfNotPresent
-    image: docker.io/reanahub/reana-server:0.9.1-alpha.3
+    image: docker.io/reanahub/reana-server:0.9.1-alpha.4
     environment:
       REANA_MAX_CONCURRENT_BATCH_WORKFLOWS: 30
       REANA_SCHEDULER_REQUEUE_SLEEP: 15
@@ -101,20 +101,20 @@ components:
       log_5xx: true
   reana_workflow_controller:
     imagePullPolicy: IfNotPresent
-    image: docker.io/reanahub/reana-workflow-controller:0.9.1-alpha.2
+    image: docker.io/reanahub/reana-workflow-controller:0.9.1-alpha.3
     environment:
       SHARED_VOLUME_PATH: /var/reana
       REANA_JOB_STATUS_CONSUMER_PREFETCH_COUNT: 10
   reana_workflow_engine_cwl:
-    image: docker.io/reanahub/reana-workflow-engine-cwl:0.9.1-alpha.1
+    image: docker.io/reanahub/reana-workflow-engine-cwl:0.9.1-alpha.2
   reana_workflow_engine_yadage:
-    image: docker.io/reanahub/reana-workflow-engine-yadage:0.9.1-alpha.1
+    image: docker.io/reanahub/reana-workflow-engine-yadage:0.9.1-alpha.2
   reana_workflow_engine_serial:
-    image: docker.io/reanahub/reana-workflow-engine-serial:0.9.1-alpha.1
+    image: docker.io/reanahub/reana-workflow-engine-serial:0.9.1-alpha.2
   reana_workflow_engine_snakemake:
-    image: docker.io/reanahub/reana-workflow-engine-snakemake:0.9.1-alpha.1
+    image: docker.io/reanahub/reana-workflow-engine-snakemake:0.9.1-alpha.2
   reana_job_controller:
-    image: docker.io/reanahub/reana-job-controller:0.9.1-alpha.2
+    image: docker.io/reanahub/reana-job-controller:0.9.1-alpha.3
   reana_message_broker:
     imagePullPolicy: IfNotPresent
     image: docker.io/reanahub/reana-message-broker:0.9.1-alpha.1
diff --git a/reana/version.py b/reana/version.py
index 5120691d..2cefd760 100644
--- a/reana/version.py
+++ b/reana/version.py
@@ -13,4 +13,4 @@
 
 from __future__ import absolute_import, print_function
 
-__version__ = "0.9.1a3"
+__version__ = "0.9.1a4"
diff --git a/scripts/prefetch-images.sh b/scripts/prefetch-images.sh
index 5cefb2ff..8caf212e 100755
--- a/scripts/prefetch-images.sh
+++ b/scripts/prefetch-images.sh
@@ -11,15 +11,15 @@ for image in \
     docker.io/maildev/maildev:1.1.0 \
     docker.io/library/postgres:12.13 \
     docker.io/library/redis:5.0.5 \
-    docker.io/reanahub/reana-job-controller:0.9.1-alpha.2 \
+    docker.io/reanahub/reana-job-controller:0.9.1-alpha.3 \
     docker.io/reanahub/reana-message-broker:0.9.1-alpha.1 \
-    docker.io/reanahub/reana-server:0.9.1-alpha.3 \
-    docker.io/reanahub/reana-ui:0.9.1-alpha.3 \
-    docker.io/reanahub/reana-workflow-controller:0.9.1-alpha.2 \
-    docker.io/reanahub/reana-workflow-engine-cwl:0.9.1-alpha.1 \
-    docker.io/reanahub/reana-workflow-engine-serial:0.9.1-alpha.1 \
-    docker.io/reanahub/reana-workflow-engine-snakemake:0.9.1-alpha.1 \
-    docker.io/reanahub/reana-workflow-engine-yadage:0.9.1-alpha.1 \
+    docker.io/reanahub/reana-server:0.9.1-alpha.4 \
+    docker.io/reanahub/reana-ui:0.9.1-alpha.4 \
+    docker.io/reanahub/reana-workflow-controller:0.9.1-alpha.3 \
+    docker.io/reanahub/reana-workflow-engine-cwl:0.9.1-alpha.2 \
+    docker.io/reanahub/reana-workflow-engine-serial:0.9.1-alpha.2 \
+    docker.io/reanahub/reana-workflow-engine-snakemake:0.9.1-alpha.2 \
+    docker.io/reanahub/reana-workflow-engine-yadage:0.9.1-alpha.2 \
     ; do
         docker pull $image
         kind load docker-image $image