diff --git a/testing/benchmark/variables.tf b/testing/benchmark/variables.tf
index deb2d05d6b0..577ef373ac6 100644
--- a/testing/benchmark/variables.tf
+++ b/testing/benchmark/variables.tf
@@ -20,7 +20,8 @@ variable "deployment_template" {
 }
 
 variable "stack_version" {
-  default     = "latest"
+  # Use the latest 8 version until 9 is ready.
+  default     = "8.?.?"
   description = "Optional stack version"
   type        = string
 }
diff --git a/testing/cloud/variables.tf b/testing/cloud/variables.tf
index fafb0c716c9..53c58d293ae 100644
--- a/testing/cloud/variables.tf
+++ b/testing/cloud/variables.tf
@@ -13,7 +13,8 @@ variable "deployment_template" {
 }
 
 variable "stack_version" {
-  default     = "latest"
+  # Use the latest 8 version until 9 is ready.
+  default     = "8.?.?"
   description = "Optional stack version"
   type        = string
 }
diff --git a/testing/infra/terraform/modules/ec_deployment/variables.tf b/testing/infra/terraform/modules/ec_deployment/variables.tf
index 1a0f67932e7..f4401ea00cc 100644
--- a/testing/infra/terraform/modules/ec_deployment/variables.tf
+++ b/testing/infra/terraform/modules/ec_deployment/variables.tf
@@ -19,7 +19,8 @@ variable "deployment_template" {
 }
 
 variable "stack_version" {
-  default     = "latest"
+  # Use the latest 8 version until 9 is ready.
+  default     = "8.?.?"
   description = "Optional stack version"
   type        = string
 }
diff --git a/testing/infra/terraform/modules/standalone_apm_server/variables.tf b/testing/infra/terraform/modules/standalone_apm_server/variables.tf
index d0e11890832..f642a25b10a 100644
--- a/testing/infra/terraform/modules/standalone_apm_server/variables.tf
+++ b/testing/infra/terraform/modules/standalone_apm_server/variables.tf
@@ -28,7 +28,8 @@ variable "elasticsearch_password" {
 }
 
 variable "stack_version" {
-  default     = "latest"
+  # Use the latest 8 version until 9 is ready.
+  default     = "8.?.?"
   description = "Optional stack version"
   type        = string
 }
diff --git a/testing/rally-cloud/variables.tf b/testing/rally-cloud/variables.tf
index 49517b124d2..35bbc52e448 100644
--- a/testing/rally-cloud/variables.tf
+++ b/testing/rally-cloud/variables.tf
@@ -11,9 +11,10 @@ variable "deployment_template" {
 }
 
 variable "stack_version" {
+  # Use the latest 8 version until 9 is ready.
+  default     = "8.?.?"
   type        = string
   description = "Optional stack version"
-  default     = "latest"
 }
 
 variable "elasticsearch_size" {
diff --git a/testing/smoke/lib.sh b/testing/smoke/lib.sh
index 12cd241e9f0..78d85b581bd 100644
--- a/testing/smoke/lib.sh
+++ b/testing/smoke/lib.sh
@@ -41,7 +41,8 @@ get_latest_snapshot() {
     if [ $RC -ne 0 ]; then echo "${RES}"; fi
     # NOTE: semver with SNAPSHOT is not working when using the sort_by function in jq,
     #       that's the reason for transforming the SNAPSHOT in a semver 4 digits.
-    VERSIONS=$(echo "${RES}" | jq -r -c '[.stacks[].version | select(. | contains("-SNAPSHOT"))] | sort' | sed 's#-SNAPSHOT#.0#g' | jq -r -c ' sort_by(.| split(".") | map(tonumber))' | sed 's#.0"#-SNAPSHOT"#g' | jq -r -c .)
+    # Filter out 9.0.0 temporarily until it's ready.
+    VERSIONS=$(echo "${RES}" | jq -r -c '[.stacks[].version | select(. | startswith("9.0.0") | not) | select(. | contains("-SNAPSHOT"))] | sort' | sed 's#-SNAPSHOT#.0#g' | jq -r -c ' sort_by(.| split(".") | map(tonumber))' | sed 's#.0"#-SNAPSHOT"#g' | jq -r -c .)
 }
 
 get_latest_snapshot_for_version() {
diff --git a/testing/smoke/managed/main.tf b/testing/smoke/managed/main.tf
index 3fead67e50e..a5d6fd35a28 100644
--- a/testing/smoke/managed/main.tf
+++ b/testing/smoke/managed/main.tf
@@ -77,7 +77,8 @@ variable "aws_provisioner_key_name" {
 }
 
 variable "stack_version" {
-  default     = "latest"
+  # Use the latest 8 version until 9 is ready.
+  default     = "8.?.?"
   description = "Optional stack version"
   type        = string
 }
diff --git a/testing/smoke/supported-os/main.tf b/testing/smoke/supported-os/main.tf
index 9674b1829ba..a5d6149ca49 100644
--- a/testing/smoke/supported-os/main.tf
+++ b/testing/smoke/supported-os/main.tf
@@ -77,7 +77,8 @@ variable "aws_provisioner_key_name" {
 }
 
 variable "stack_version" {
-  default     = "latest"
+  # Use the latest 8 version until 9 is ready.
+  default     = "8.?.?"
   description = "Optional stack version"
   type        = string
 }