diff --git a/regression-tests/__snapshots__/regresion.test.js.snap b/regression-tests/__snapshots__/regresion.test.js.snap
index df32cd2..87c4529 100644
--- a/regression-tests/__snapshots__/regresion.test.js.snap
+++ b/regression-tests/__snapshots__/regresion.test.js.snap
@@ -722,6 +722,102 @@ Array [
     "path": "./regression-tests/eventlistener-test.yaml",
     "rule": "no-missing-resource",
   },
+  Object {
+    "level": "warning",
+    "loc": Object {
+      "endColumn": 20,
+      "endLine": 9,
+      "range": Array [
+        130,
+        136,
+      ],
+      "startColumn": 14,
+      "startLine": 9,
+    },
+    "message": "Invalid image: 'alpine'. Specify the image tag instead of using ':latest'",
+    "path": "./regression-tests/no-duplicate-env.yaml",
+    "rule": "no-latest-image",
+  },
+  Object {
+    "level": "warning",
+    "loc": Object {
+      "endColumn": 20,
+      "endLine": 21,
+      "range": Array [
+        318,
+        324,
+      ],
+      "startColumn": 14,
+      "startLine": 21,
+    },
+    "message": "Invalid image: 'alpine'. Specify the image tag instead of using ':latest'",
+    "path": "./regression-tests/no-duplicate-env.yaml",
+    "rule": "no-latest-image",
+  },
+  Object {
+    "level": "error",
+    "loc": Object {
+      "endColumn": 20,
+      "endLine": 25,
+      "range": Array [
+        393,
+        396,
+      ],
+      "startColumn": 17,
+      "startLine": 25,
+    },
+    "message": "Step 'step-2' has env variable 'FOO' duplicated in task 'no-duplicate-env-1'.",
+    "path": "./regression-tests/no-duplicate-env.yaml",
+    "rule": "no-duplicate-env",
+  },
+  Object {
+    "level": "warning",
+    "loc": Object {
+      "endColumn": 20,
+      "endLine": 33,
+      "range": Array [
+        506,
+        512,
+      ],
+      "startColumn": 14,
+      "startLine": 33,
+    },
+    "message": "Invalid image: 'alpine'. Specify the image tag instead of using ':latest'",
+    "path": "./regression-tests/no-duplicate-env.yaml",
+    "rule": "no-latest-image",
+  },
+  Object {
+    "level": "warning",
+    "loc": Object {
+      "endColumn": 20,
+      "endLine": 52,
+      "range": Array [
+        797,
+        803,
+      ],
+      "startColumn": 14,
+      "startLine": 52,
+    },
+    "message": "Invalid image: 'alpine'. Specify the image tag instead of using ':latest'",
+    "path": "./regression-tests/no-duplicate-env.yaml",
+    "rule": "no-latest-image",
+  },
+  Object {
+    "level": "warning",
+    "loc": Object {
+      "endColumn": 20,
+      "endLine": 69,
+      "range": Array [
+        1051,
+        1057,
+      ],
+      "startColumn": 14,
+      "startLine": 69,
+    },
+    "message": "Invalid image: 'alpine'. Specify the image tag instead of using ':latest'",
+    "path": "./regression-tests/no-duplicate-env.yaml",
+    "rule": "no-latest-image",
+  },
   Object {
     "level": "warning",
     "loc": Object {
diff --git a/regression-tests/no-duplicate-env.yaml b/regression-tests/no-duplicate-env.yaml
new file mode 100644
index 0000000..835c821
--- /dev/null
+++ b/regression-tests/no-duplicate-env.yaml
@@ -0,0 +1,76 @@
+---
+apiVersion: tekton.dev/v1beta1
+kind: Task
+metadata:
+  name: no-duplicate-env-1
+spec:
+  steps:
+    - name: step-1
+      image: alpine
+      env:
+        - name: FOO
+          value: foo
+        - name: BAR
+          value: bar
+      script: |
+        #!/bin/sh
+
+        echo ${FOO}
+
+    - name: step-2
+      image: alpine
+      env:
+        - name: FOO
+          value: foo
+        - name: FOO
+          value: foo
+      script: |
+        #!/bin/sh
+
+        echo ${FOO}
+
+    - name: step-3
+      image: alpine
+      script: |
+        #!/bin/sh
+
+        echo ${FOO}
+---
+apiVersion: tekton.dev/v1beta1
+kind: Task
+metadata:
+  name: no-duplicate-env-2
+spec:
+  stepTemplate:
+    env:
+      - name: FOO
+        value: foo
+      - name: FOO
+        value: foo
+  steps:
+    - name: step-1
+      image: alpine
+      script: |
+        #!/bin/sh
+
+        echo ${FOO}
+---
+apiVersion: tekton.dev/v1beta1
+kind: Task
+metadata:
+  name: no-duplicate-env-3
+spec:
+  stepTemplate:
+    env:
+      - name: FOO
+        value: foo
+  steps:
+    - name: step-1
+      image: alpine
+      env:
+        - name: FOO
+          value: foo
+      script: |
+        #!/bin/sh
+
+        echo ${FOO}