diff --git a/.github/actions/test-server/README.md b/.github/actions/test-server/README.md
index 728e87213..2926efc38 100644
--- a/.github/actions/test-server/README.md
+++ b/.github/actions/test-server/README.md
@@ -25,7 +25,4 @@ Use the action by adding the following to a Github workflow:
 
 Note that it's recommended to pin the action version to the same version as `jimm-version` to ensure the action works as expected for that specific version of JIMM.
 
-The action accepts the following inputs:
-- `jimm-version`: The version of JIMM you want to test against.
-- `juju-channel`: The snap channel to use when installing and bootstrapping Juju.
-- `ghcr-pat`: A PAT token with package:read access that has access to the `canonical/jimm` repo.
\ No newline at end of file
+For full details on the inputs see `action.yaml`.
diff --git a/.github/actions/test-server/action.yaml b/.github/actions/test-server/action.yaml
index 44ce7ff66..c2752ae03 100644
--- a/.github/actions/test-server/action.yaml
+++ b/.github/actions/test-server/action.yaml
@@ -3,13 +3,17 @@ description: "Create a JIMM environment"
 
 inputs:
   jimm-version:
-    description: 'JIMM version tag to use. This will decide the version of JIMM to start e.g. v3.1.7'
+    description: >
+      JIMM version tag to use. This will decide the version of JIMM to start e.g. v3.1.7
+      A special tag of "dev" can be provided to use the current development version of JIMM.
     required: true
   juju-channel:
     description: 'Juju snap channel to pass to charmed-kubernetes/actions-operator'
     required: false
   ghcr-pat:
-    description: 'PAT Token that has package:read access to canonical/JIMM'
+    description: >
+      PAT Token that has package:read access to canonical/JIMM
+      The PAT token can be left empty when building the development version of JIMM.
     required: true
 
 output:
@@ -27,16 +31,22 @@ runs:
   using: "composite"
   steps:
     - name: Login to GitHub Container Registry
+      if: ${{ inputs.jimm-version != 'dev' }}
       uses: docker/login-action@v3
       with:
         registry: ghcr.io
         username: ${{ github.actor }}
         password: ${{ inputs.ghcr-pat }}
-    - name: Start server and dependencies
+    - name: Start server based on released version
+      if: ${{ inputs.jimm-version != 'dev' }}
       run: make integration-test-env
       shell: bash
       env:
         JIMM_VERSION: ${{ inputs.jimm-version }}
+    - name: Start server based on development version
+      if: ${{ inputs.jimm-version == 'dev' }}
+      run: make dev-env
+      shell: bash
     - name: Initialise LXD
       run: |
         sudo lxd waitready && \
diff --git a/.github/workflows/integration-test.yaml b/.github/workflows/integration-test.yaml
index ba3f05602..bec5052d0 100644
--- a/.github/workflows/integration-test.yaml
+++ b/.github/workflows/integration-test.yaml
@@ -17,11 +17,19 @@ jobs:
     steps:
       - name: Checkout JIMM repo
         uses: actions/checkout@v4
+      - name: Setup Go
+        if: ${{ github.event_name == 'pull_request' }}
+        uses: actions/setup-go@v4
+        with:
+          go-version-file: 'go.mod'
+      - name: Go vendor to speed up docker build
+        if: ${{ github.event_name == 'pull_request' }}
+        run: go mod vendor
       - name: Start JIMM (fixed version)
         if: ${{ github.event_name == 'pull_request' }}
         uses: ./.github/actions/test-server
         with:
-          jimm-version: v3.1.7
+          jimm-version: dev
           juju-channel: "3/stable"
           ghcr-pat: ${{ secrets.GITHUB_TOKEN }}
       - name: Start JIMM (user provided version)