diff --git a/.github/workflows/ci_cd.yml b/.github/workflows/ci_cd.yml
index 85aefdf4f..9170cf3c0 100644
--- a/.github/workflows/ci_cd.yml
+++ b/.github/workflows/ci_cd.yml
@@ -3,6 +3,15 @@ name: GitHub CI
 on:
   pull_request:
   workflow_dispatch:
+    inputs:
+      revn:
+        type: choice
+        options:
+        - '251'
+        - '242'
+        - '241'
+        description: 'The Mechanical revision number to run tests on.'
+        default: '241' #stable version is 241, must match $stable_container
   schedule:
     - cron: '00 22 * * *'  # UTC time, may start 5-15 mins later than scheduled time
   # registry_package:
@@ -15,6 +24,8 @@ on:
       - main
       - release/*
 
+
+
 env:
   PYMECHANICAL_PORT: 10000  # default won't work on GitHub runners
   PYMECHANICAL_START_INSTANCE: false
@@ -23,9 +34,6 @@ env:
   PACKAGE_NAME: ansys-mechanical-core
   DOCUMENTATION_CNAME: mechanical.docs.pyansys.com
   MAIN_PYTHON_VERSION: '3.10'
-  # LATEST_STABLE_REVN and its Docker image are used in pull requests
-  LATEST_STABLE_REVN: '241'
-  LATEST_STABLE_DOCKER_IMAGE_VERSION: '24.1.0'
   # DEV_REVN & its Docker image are used in scheduled or registry package runs
   DEV_REVN: '242'
   DEV_DOCKER_IMAGE_VERSION: '24.2_candidate'
@@ -109,21 +117,26 @@ jobs:
         run: |
           if ${{ github.event_name == 'schedule' }}; then
             # 242
-            echo "test_revn=${{ env.DEV_REVN }}" >> $GITHUB_OUTPUT
+            echo "test_revn=${{ inputs.mech_revn }}" >> $GITHUB_OUTPUT
             # ghcr.io/ansys/mechanical:24.2_candidate
             echo "test_container=${{ env.DOCKER_PACKAGE }}:${{ env.DEV_DOCKER_IMAGE_VERSION }}" >> $GITHUB_OUTPUT
             # 24.2_candidate
             echo "test_docker_image_version=${{ env.DEV_DOCKER_IMAGE_VERSION }}" >> $GITHUB_OUTPUT
           else
-            # 241
+            if [[ -z "${{inputs.revn}}" ]]; then
+              export mech_revn=241
+            else
+              export mech_revn=${{inputs.revn}}
+            fi
+            export mech_image_version=${mech_revn:0:2}.${mech_revn:2}.0
             echo "test_revn=${{ env.LATEST_STABLE_REVN }}" >> $GITHUB_OUTPUT
             # ghcr.io/ansys/mechanical:24.1.0
-            echo "test_container=${{ env.DOCKER_PACKAGE }}:${{ env.LATEST_STABLE_DOCKER_IMAGE_VERSION }}" >> $GITHUB_OUTPUT
+            echo "test_container=${{ env.DOCKER_PACKAGE }}:$mech_image_version" >> $GITHUB_OUTPUT
             # 24.1.0
-            echo "test_docker_image_version=${{ env.LATEST_STABLE_DOCKER_IMAGE_VERSION }}" >> $GITHUB_OUTPUT
+            echo "test_docker_image_version=$mech_image_version" >> $GITHUB_OUTPUT
           fi
 
-          echo "stable_container=${{ env.DOCKER_PACKAGE }}:${{ env.LATEST_STABLE_DOCKER_IMAGE_VERSION }}" >> $GITHUB_OUTPUT
+          echo "stable_container=${{ env.DOCKER_PACKAGE }}:24.1.0" >> $GITHUB_OUTPUT
 
   config-matrix:
     runs-on: ubuntu-latest
diff --git a/doc/changelog.d/771.changed.md b/doc/changelog.d/771.changed.md
new file mode 100644
index 000000000..24ab155c0
--- /dev/null
+++ b/doc/changelog.d/771.changed.md
@@ -0,0 +1 @@
+Test specific version
\ No newline at end of file