diff --git a/.github/workflows/e2e-fork.yml b/.github/workflows/e2e-fork.yml
index 58ff2d2a759..19d397230a9 100644
--- a/.github/workflows/e2e-fork.yml
+++ b/.github/workflows/e2e-fork.yml
@@ -9,6 +9,11 @@ on:
       - '**.md'
       - 'LICENSE'
 
+# cancel workflows if a new one is triggered on the same branch.
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
 jobs:
   # dynamically build a matrix of test/test suite pairs to run
   build-test-matrix:
diff --git a/.github/workflows/e2e-wasm.yaml b/.github/workflows/e2e-wasm.yaml
index 6970b558032..7a186acf11b 100644
--- a/.github/workflows/e2e-wasm.yaml
+++ b/.github/workflows/e2e-wasm.yaml
@@ -17,6 +17,11 @@ on:
       # trigger workflow if PR is marked ready for review.
       - ready_for_review
 
+# cancel workflows if a new one is triggered on the same branch.
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
 jobs:
   # determine-image-tag will either output the PR number e.g. pr-1234 or the string main.
   # this will be used to tag the images that are built during the workflow.
diff --git a/.github/workflows/e2e.yaml b/.github/workflows/e2e.yaml
index 041dd04489c..a15261b4888 100644
--- a/.github/workflows/e2e.yaml
+++ b/.github/workflows/e2e.yaml
@@ -16,6 +16,10 @@ on:
       - 'docs/**'
       - '**.md'
       - 'LICENSE'
+# cancel workflows if a new one is triggered on the same branch.
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
 
 jobs:
   # determine-image-tag will either output the PR number e.g. pr-1234 or the string main.