diff --git a/.github/workflows/bench.yaml b/.github/workflows/bench.yaml
index 8cb15d1..1bb45d1 100644
--- a/.github/workflows/bench.yaml
+++ b/.github/workflows/bench.yaml
@@ -21,7 +21,7 @@ jobs:
       - name: Set up Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: stable
+          toolchain: 1.39.0
           profile: minimal
           default: true
       - name: Set up Node.js module
diff --git a/.github/workflows/cli.yml b/.github/workflows/cli.yml
index 256af96..c22565f 100644
--- a/.github/workflows/cli.yml
+++ b/.github/workflows/cli.yml
@@ -37,7 +37,7 @@ jobs:
       - name: Set up Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: stable
+          toolchain: 1.39.0
           profile: minimal
           default: true
       - name: Build CLI
diff --git a/.github/workflows/java.yml b/.github/workflows/java.yml
index 47cc5cc..2b3f9d8 100644
--- a/.github/workflows/java.yml
+++ b/.github/workflows/java.yml
@@ -26,7 +26,7 @@ jobs:
       - name: Set up Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: stable
+          toolchain: 1.39.0
           profile: minimal
           default: true
       - name: Build Java native library
diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index 7aa5bf8..c39080c 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -33,7 +33,7 @@ jobs:
       - name: Set up Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: stable
+          toolchain: 1.39.0
           profile: minimal
           default: true
       - name: Build native module
diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index da15fc7..7810024 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -60,7 +60,7 @@ jobs:
       - name: Set up Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: stable
+          toolchain: 1.39.0
           profile: minimal
           default: true
       - name: Build Ruby native library