diff --git a/.github/workflows/docker-build.yml b/.github/workflows/docker-build.yml
index 31d6840..25bd4f3 100644
--- a/.github/workflows/docker-build.yml
+++ b/.github/workflows/docker-build.yml
@@ -25,9 +25,9 @@ jobs:
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
       - name: Build docker image (arm64)
-        run: task build PLATFORM_SUFFIX=arm64 PLATFORM=linux/arm64/v8 AWS_ACC=${{ secrets.AWS_ACC }}
+        run: task build PLATFORM_SUFFIX=arm64 PLATFORM=linux/arm64/v8 AWS_ACC=${{ secrets.AWS_ACC }} SFRUNNER_VER=${{ github.run_number }}
       - name: Build docker image (amd64)
-        run: task build PLATFORM_SUFFIX=amd64 PLATFORM=linux/amd64 AWS_ACC=${{ secrets.AWS_ACC }}
+        run: task build PLATFORM_SUFFIX=amd64 PLATFORM=linux/amd64 AWS_ACC=${{ secrets.AWS_ACC }} SFRUNNER_VER=${{ github.run_number }}
       - name: Log into AWS
         uses: aws-actions/configure-aws-credentials@v1.7.0
         with:
diff --git a/README.md b/README.md
index 2ab24c9..c0a00fa 100644
--- a/README.md
+++ b/README.md
@@ -106,12 +106,15 @@ However, you can install sfrunner directly, clone the repository and run the fol
 `sfrunner` directory
 
 ```bash
-task build PLATFORM=linux/arm64/v8 PLATFORM_SUMMARY=arm64 AWS_ACC=[AWSACCOUNTID]
+task build PLATFORM=linux/arm64/v8 PLATFORM_SUMMARY=arm64 AWS_ACC=[AWSACCOUNTID] SFRUNNER_VER=[SFRUNNER_VER]
 task install
 echo 'export WITH_DOCKER=true #automatically run sfrunner with docker support' >> ~/.zshrc
 ```
 Take care to substitute the AWS account ID for the mgmt account in place of `[AWSACCOUNTID]`.  
 
+Subsitute a version number in the place of `[SFRUNNER_VER]` - this will be accessible inside
+the container in the environment variable `SFRUNNER_VER`. 
+
 The example above is assuming Apple Silicon, but substitute different values for `PLATFORM` and `PLATFORM_SUMMARY` as 
 appropriate.
 
diff --git a/src/Dockerfile b/src/Dockerfile
index 8027ca8..c9b4ebf 100644
--- a/src/Dockerfile
+++ b/src/Dockerfile
@@ -76,6 +76,8 @@ ENV AWS_REGION_ABBREVIATION_TYPE=fixed
 ARG AWS_ACC
 ENV DOCKER_IMAGE="${AWS_ACC}.dkr.ecr.eu-west-2.amazonaws.com/uec-sf/sfrunner"
 ENV DOCKER_TAG="latest"
+ARG SFRUNNER_VER
+ENV SFRUNNER_VER="${SFRUNNER_VER}"
 
 ENV JAVA_HOME=/usr/lib/jvm/temurin-20-jdk-arm64
 
diff --git a/taskfile.yml b/taskfile.yml
index 9130d91..60ca593 100644
--- a/taskfile.yml
+++ b/taskfile.yml
@@ -14,11 +14,12 @@ tasks:
       PLATFORM: '{{.PLATFORM}}'
       PLATFORM_SUFFIX: '{{.PLATFORM_SUFFIX}}'
       AWS_ACC: '{{.AWS_ACC}}'
+      SFRUNNER_VER: '{{.SFRUNNER_VER}}'
     requires:
-      vars: [PLATFORM, PLATFORM_SUFFIX, AWS_ACC]
+      vars: [PLATFORM, PLATFORM_SUFFIX, AWS_ACC, SFRUNNER_VER]
     dir: src
     cmds:
-      - docker build -t sfrunner:latest-{{.PLATFORM_SUFFIX}} --platform {{.PLATFORM}} --build-arg AWS_ACC={{.AWS_ACC}} .
+      - docker build -t sfrunner:latest-{{.PLATFORM_SUFFIX}} --platform {{.PLATFORM}} --build-arg AWS_ACC={{.AWS_ACC}} --build-arg SFRUNNER_VER={{.SFRUNNER_VER}} .
 
   run:
     desc: Runs a shell inside the sfrunner image