diff --git a/languageserver/src/value-providers.ts b/languageserver/src/value-providers.ts
index 3180431..f8245e0 100644
--- a/languageserver/src/value-providers.ts
+++ b/languageserver/src/value-providers.ts
@@ -20,10 +20,12 @@ export function valueProviders(
   return {
     "job-environment": {
       kind: ValueProviderKind.AllowedValues,
+      caseInsensitive: true,
       get: (_: WorkflowContext) => getEnvironments(client, cache, repo.owner, repo.name)
     },
     "job-environment-name": {
       kind: ValueProviderKind.AllowedValues,
+      caseInsensitive: true,
       get: (_: WorkflowContext) => getEnvironments(client, cache, repo.owner, repo.name)
     },
     "runs-on": {
diff --git a/languageservice/src/validate.test.ts b/languageservice/src/validate.test.ts
index ae54e4c..a583239 100644
--- a/languageservice/src/validate.test.ts
+++ b/languageservice/src/validate.test.ts
@@ -3,6 +3,7 @@ import {createDocument} from "./test-utils/document";
 import {validate} from "./validate";
 import {defaultValueProviders} from "./value-providers/default";
 import {clearCache} from "./utils/workflow-cache";
+import {ValueProvider, ValueProviderConfig, ValueProviderKind} from "./value-providers/config";
 
 beforeEach(() => {
   clearCache();
@@ -193,4 +194,65 @@ jobs:
       }
     } as Diagnostic);
   });
+
+  describe("value provider case sensitivity", () => {
+    it("value with a different case and case sensitive provider", async () => {
+      const workflow = `
+  on: push
+  jobs:
+    build:
+      runs-on: ubuntu-latest
+      environment: TEST
+      steps:
+      - run: echo
+  `;
+      const valueProviderConfig: ValueProviderConfig = {
+        "job-environment": {
+          kind: ValueProviderKind.AllowedValues,
+          get: async () => [{label: "test"}],
+          caseInsensitive: false
+        }
+      };
+
+      const result = await validate(createDocument("wf.yaml", workflow), {valueProviderConfig});
+      expect(result).toEqual([
+        {
+          message: "Value 'TEST' is not valid",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {
+              line: 5,
+              character: 19
+            },
+            end: {
+              line: 5,
+              character: 23
+            }
+          }
+        }
+      ]);
+    });
+
+    it("value with a different case and case insensitive provider", async () => {
+      const workflow = `
+  on: push
+  jobs:
+    build:
+      runs-on: ubuntu-latest
+      environment: TEST
+      steps:
+      - run: echo
+  `;
+      const valueProviderConfig: ValueProviderConfig = {
+        "job-environment": {
+          kind: ValueProviderKind.AllowedValues,
+          get: async () => [{label: "test"}],
+          caseInsensitive: true
+        }
+      };
+
+      const result = await validate(createDocument("wf.yaml", workflow), {valueProviderConfig});
+      expect(result).toEqual([]);
+    });
+  });
 });
diff --git a/languageservice/src/validate.ts b/languageservice/src/validate.ts
index 8161e42..bf1c025 100644
--- a/languageservice/src/validate.ts
+++ b/languageservice/src/validate.ts
@@ -130,10 +130,11 @@ async function additionalValidations(
 
       if (valueProvider) {
         const customValues = await valueProvider.get(getProviderContext(documentUri, template, root, token));
-        const customValuesMap = new Set(customValues.map(x => x.label));
+        const caseInsensitive = valueProvider.caseInsensitive ?? false;
+        const customValuesMap = new Set(customValues.map(x => (caseInsensitive ? x.label.toLowerCase() : x.label)));
 
         if (isString(token)) {
-          if (!customValuesMap.has(token.value)) {
+          if (!customValuesMap.has(caseInsensitive ? token.value.toLowerCase() : token.value)) {
             invalidValue(diagnostics, token, valueProvider.kind);
           }
         }
diff --git a/languageservice/src/value-providers/config.ts b/languageservice/src/value-providers/config.ts
index 8531651..c8f90dd 100644
--- a/languageservice/src/value-providers/config.ts
+++ b/languageservice/src/value-providers/config.ts
@@ -21,6 +21,7 @@ export enum ValueProviderKind {
 
 export type ValueProvider = {
   kind: ValueProviderKind;
+  caseInsensitive?: boolean;
   get: (context: WorkflowContext, existingValues?: Set<string>) => Promise<Value[]>;
 };