diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 978a91e..b95ec13 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v1
         with:
-          node-version: 20
+          node-version: 18
 
       - uses: actions/checkout@v2
 
@@ -34,7 +34,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v1
         with:
-          node-version: 20
+          node-version: 18
 
       - uses: actions/checkout@v2
 
diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index ad5c533..349fba8 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -14,7 +14,7 @@ jobs:
       - name: Generate coverage report
         uses: actions/setup-node@v1
         with:
-          node-version: '20'
+          node-version: '18'
       - run: npm install
       - run: npm run run-coverage
       - run: npm run generate-report
diff --git a/.github/workflows/publish.yaml b/.github/workflows/publish.yaml
index 736c8c3..554aa77 100644
--- a/.github/workflows/publish.yaml
+++ b/.github/workflows/publish.yaml
@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v1
         with:
-          node-version: 20
+          node-version: 18
 
       - uses: actions/checkout@v2
       - name: Build
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9380959..65610c5 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix: 
-        node: [16, 18, 20]
+        node: [16, 18]
         
     steps:
       - uses: actions/setup-node@v1
diff --git a/.github/workflows/test_e2e.yml b/.github/workflows/test_e2e.yml
index 4fa8ab1..c7d428d 100644
--- a/.github/workflows/test_e2e.yml
+++ b/.github/workflows/test_e2e.yml
@@ -85,7 +85,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v1
         with:
-          node-version: 20
+          node-version: 18
 
       - uses: actions/cache@v2
         id: cache-deps
diff --git a/.github/workflows/test_e2e_IBC.yml b/.github/workflows/test_e2e_IBC.yml
index 6265a04..ccfc2d1 100644
--- a/.github/workflows/test_e2e_IBC.yml
+++ b/.github/workflows/test_e2e_IBC.yml
@@ -226,7 +226,7 @@ jobs:
             - name: Setup Node.js
               uses: actions/setup-node@v1
               with:
-                node-version: 20
+                node-version: 18
 
             - uses: actions/cache@v2
               id: cache-deps
diff --git a/.github/workflows/upload.yaml b/.github/workflows/upload.yaml
index 12ab8d6..cd75de3 100644
--- a/.github/workflows/upload.yaml
+++ b/.github/workflows/upload.yaml
@@ -12,7 +12,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v1
         with:
-          node-version: 20
+          node-version: 18
 
       - uses: actions/checkout@v2
       - name: build lib