diff --git a/helm/reana/Chart.yaml b/helm/reana/Chart.yaml
index e354cf5f..4723bf0a 100644
--- a/helm/reana/Chart.yaml
+++ b/helm/reana/Chart.yaml
@@ -27,7 +27,7 @@ keywords:
   - reusable-science
 type: application
 # Chart version.
-version: 0.9.0-alpha.5
+version: 0.9.0-alpha.6
 kubeVersion: ">= 1.19.0-0 < 1.26.0-0"
 dependencies:
   - name: traefik
diff --git a/helm/reana/values.yaml b/helm/reana/values.yaml
index 487683bc..8d29d980 100644
--- a/helm/reana/values.yaml
+++ b/helm/reana/values.yaml
@@ -62,12 +62,12 @@ components:
     docs_url: https://docs.reana.io
     forum_url: https://forum.reana.io
     imagePullPolicy: IfNotPresent
-    image: reanahub/reana-ui:0.9.0-alpha.5
+    image: reanahub/reana-ui:0.9.0-alpha.6
   reana_db:
     enabled: true
   reana_server:
     imagePullPolicy: IfNotPresent
-    image: reanahub/reana-server:0.9.0-alpha.5
+    image: reanahub/reana-server:0.9.0-alpha.6
     environment:
       REANA_MAX_CONCURRENT_BATCH_WORKFLOWS: 30
       REANA_SCHEDULER_REQUEUE_SLEEP: 15
@@ -86,20 +86,20 @@ components:
       log_5xx: true
   reana_workflow_controller:
     imagePullPolicy: IfNotPresent
-    image: reanahub/reana-workflow-controller:0.9.0-alpha.5
+    image: reanahub/reana-workflow-controller:0.9.0-alpha.6
     environment:
       SHARED_VOLUME_PATH: /var/reana
       REANA_JOB_STATUS_CONSUMER_PREFETCH_COUNT: 10
   reana_workflow_engine_cwl:
-    image: reanahub/reana-workflow-engine-cwl:0.9.0-alpha.4
+    image: reanahub/reana-workflow-engine-cwl:0.9.0-alpha.5
   reana_workflow_engine_yadage:
-    image: reanahub/reana-workflow-engine-yadage:0.9.0-alpha.4
+    image: reanahub/reana-workflow-engine-yadage:0.9.0-alpha.5
   reana_workflow_engine_serial:
-    image: reanahub/reana-workflow-engine-serial:0.9.0-alpha.4
+    image: reanahub/reana-workflow-engine-serial:0.9.0-alpha.5
   reana_workflow_engine_snakemake:
-    image: reanahub/reana-workflow-engine-snakemake:0.9.0-alpha.4
+    image: reanahub/reana-workflow-engine-snakemake:0.9.0-alpha.5
   reana_job_controller:
-    image: reanahub/reana-job-controller:0.9.0-alpha.5
+    image: reanahub/reana-job-controller:0.9.0-alpha.6
   reana_message_broker:
     imagePullPolicy: IfNotPresent
     image: reanahub/reana-message-broker:0.9.0-alpha.1
diff --git a/reana/version.py b/reana/version.py
index f5d5bddd..a9dc3bca 100644
--- a/reana/version.py
+++ b/reana/version.py
@@ -13,4 +13,4 @@
 
 from __future__ import absolute_import, print_function
 
-__version__ = "0.9.0a5"
+__version__ = "0.9.0a6"
diff --git a/scripts/prefetch-images.sh b/scripts/prefetch-images.sh
index 143a3a46..f346ca43 100755
--- a/scripts/prefetch-images.sh
+++ b/scripts/prefetch-images.sh
@@ -11,15 +11,15 @@ for image in \
         maildev/maildev:1.1.0 \
         postgres:12.10 \
         redis:5.0.5 \
-        reanahub/reana-job-controller:0.9.0-alpha.5 \
+        reanahub/reana-job-controller:0.9.0-alpha.6 \
         reanahub/reana-message-broker:0.9.0-alpha.1 \
-        reanahub/reana-server:0.9.0-alpha.5 \
-        reanahub/reana-ui:0.9.0-alpha.5 \
-        reanahub/reana-workflow-controller:0.9.0-alpha.5 \
-        reanahub/reana-workflow-engine-cwl:0.9.0-alpha.4 \
-        reanahub/reana-workflow-engine-serial:0.9.0-alpha.4 \
-        reanahub/reana-workflow-engine-snakemake:0.9.0-alpha.4 \
-        reanahub/reana-workflow-engine-yadage:0.9.0-alpha.4 \
+        reanahub/reana-server:0.9.0-alpha.6 \
+        reanahub/reana-ui:0.9.0-alpha.6 \
+        reanahub/reana-workflow-controller:0.9.0-alpha.6 \
+        reanahub/reana-workflow-engine-cwl:0.9.0-alpha.5 \
+        reanahub/reana-workflow-engine-serial:0.9.0-alpha.5 \
+        reanahub/reana-workflow-engine-snakemake:0.9.0-alpha.5 \
+        reanahub/reana-workflow-engine-yadage:0.9.0-alpha.5 \
     ; do
         docker pull $image
         kind load docker-image $image
diff --git a/setup.py b/setup.py
index 781084c4..26f96d5f 100644
--- a/setup.py
+++ b/setup.py
@@ -18,7 +18,7 @@
 history = open("CHANGES.rst").read()
 
 tests_require = [
-    "pytest-reana>=0.9.0a3,<0.10.0",
+    "pytest-reana>=0.9.0a6,<0.10.0",
 ]
 
 extras_require = {