diff --git a/.github/workflows/Basic.yml b/.github/workflows/Basic.yml
index 08679623..3d4f808e 100644
--- a/.github/workflows/Basic.yml
+++ b/.github/workflows/Basic.yml
@@ -17,7 +17,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.64.0
+          toolchain: 1.66.0
           target: wasm32-unknown-unknown
           override: true
 
@@ -48,7 +48,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.64.0
+          toolchain: 1.66.0
           override: true
           components: rustfmt, clippy
 
diff --git a/.github/workflows/checksum.yml b/.github/workflows/checksum.yml
index 7f4209b8..5981fa58 100644
--- a/.github/workflows/checksum.yml
+++ b/.github/workflows/checksum.yml
@@ -16,7 +16,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.64.0
+          toolchain: 1.66.0
           target: wasm32-unknown-unknown
           override: true
 
diff --git a/.github/workflows/gas_benchmark.yml b/.github/workflows/gas_benchmark.yml
index e9cff444..225dd24b 100644
--- a/.github/workflows/gas_benchmark.yml
+++ b/.github/workflows/gas_benchmark.yml
@@ -19,7 +19,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.64.0
+          toolchain: 1.66.0
           target: wasm32-unknown-unknown
           override: true