diff --git a/test/src/e2e.dynval/1/dv.era.test.ts b/test/src/e2e.dynval/1/dv.era.test.ts
new file mode 100644
index 0000000000..6323d6db51
--- /dev/null
+++ b/test/src/e2e.dynval/1/dv.era.test.ts
@@ -0,0 +1,86 @@
+// Copyright 2019 Kodebox, Inc.
+// This file is part of CodeChain.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import * as chai from "chai";
+import { expect } from "chai";
+import * as chaiAsPromised from "chai-as-promised";
+import "mocha";
+
+import { validators } from "../../../tendermint.dynval/constants";
+import { PromiseExpect } from "../../helper/promise";
+import { changeParams, setTermTestTimeout, withNodes } from "../setup";
+
+chai.use(chaiAsPromised);
+
+describe("Change era", function() {
+    const promiseExpect = new PromiseExpect();
+    const { nodes, initialParams } = withNodes(this, {
+        promiseExpect,
+        overrideParams: {
+            minNumOfValidators: 3,
+            maxNumOfValidators: 5
+        },
+        validators: validators.slice(0, 3).map(signer => ({
+            signer,
+            delegation: 5_000,
+            deposit: 10_000_000
+        }))
+    });
+
+    it("should be enabled", async function() {
+        const termWaiter = setTermTestTimeout(this, {
+            terms: 3
+        });
+
+        const checkingNode = nodes[0];
+        const changeTxHash = await changeParams(checkingNode, 1, {
+            ...initialParams,
+            era: 1
+        });
+
+        await checkingNode.waitForTx(changeTxHash);
+
+        await termWaiter.waitNodeUntilTerm(checkingNode, {
+            target: 3,
+            termPeriods: 2
+        });
+    });
+
+    it("must increase monotonically", async function() {
+        const termWaiter = setTermTestTimeout(this, {
+            terms: 2
+        });
+
+        const checkingNode = nodes[0];
+        const changeTxHash = await changeParams(checkingNode, 1, {
+            ...initialParams,
+            era: 1
+        });
+
+        await checkingNode.waitForTx(changeTxHash);
+
+        await expect(
+            changeParams(checkingNode, 2, {
+                ...initialParams,
+                era: 0
+            })
+        ).eventually.rejected;
+    });
+
+    afterEach(function() {
+        promiseExpect.checkFulfilled();
+    });
+});
diff --git a/test/src/e2e.dynval/setup.ts b/test/src/e2e.dynval/setup.ts
index d9c577e824..f8cb3d227a 100644
--- a/test/src/e2e.dynval/setup.ts
+++ b/test/src/e2e.dynval/setup.ts
@@ -28,7 +28,7 @@ export function withNodes(
     options: {
         promiseExpect: PromiseExpect;
         validators: ValidatorConfig[];
-        overrideParams?: Partial<typeof defaultParams>;
+        overrideParams?: Partial<CommonParams>;
         onBeforeEnable?: (nodes: CodeChain[]) => Promise<void>;
     }
 ) {
@@ -82,7 +82,7 @@ export function findNode(nodes: CodeChain[], signer: Signer) {
 async function createNodes(options: {
     promiseExpect: PromiseExpect;
     validators: ValidatorConfig[];
-    initialParams: typeof defaultParams;
+    initialParams: CommonParams;
     onBeforeEnable?: (nodes: CodeChain[]) => Promise<void>;
 }): Promise<CodeChain[]> {
     const chain = `${__dirname}/../scheme/tendermint-dynval.json`;
@@ -347,12 +347,14 @@ export const defaultParams = {
     maxCandidateMetadataSize: 128
 };
 
-export async function changeParams(
-    node: CodeChain,
-    metadataSeq: number,
-    params: typeof defaultParams
-) {
-    const newParams: any[] = [
+interface EraCommonParams {
+    era: number;
+}
+
+type CommonParams = typeof defaultParams & Partial<EraCommonParams>;
+
+function encodeParams(params: CommonParams): any[] {
+    const result = [
         params.maxExtraDataSize,
         params.maxAssetSchemeMetadataSize,
         params.maxTransferMetadataSize,
@@ -386,12 +388,23 @@ export async function changeParams(
         params.minDeposit,
         params.maxCandidateMetadataSize
     ];
+    if (params.era) {
+        result.push(params.era);
+    }
+    return result;
+}
+
+export async function changeParams(
+    node: CodeChain,
+    metadataSeq: number,
+    params: CommonParams
+) {
     const changeParamsActionRlp: [
         number,
         number,
         (number | string)[],
         ...string[]
-    ] = [0xff, metadataSeq, newParams];
+    ] = [0xff, metadataSeq, encodeParams(params)];
     const message = blake256(RLP.encode(changeParamsActionRlp).toString("hex"));
     changeParamsActionRlp.push(
         `0x${SDK.util.signEcdsa(message, faucetSecret)}`