diff --git a/.github/workflows/build-gems.yml b/.github/workflows/build-gems.yml
index f28e7a62..c42b31f4 100644
--- a/.github/workflows/build-gems.yml
+++ b/.github/workflows/build-gems.yml
@@ -20,12 +20,12 @@ jobs:
         rubyPlatform: ["aarch64-linux", "aarch64-linux-musl", "x86_64-linux", "x86_64-linux-musl", "arm64-darwin", "x86_64-darwin"]
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           submodules: recursive
 
       - name: Setup Ruby and Rust
-        uses: oxidize-rb/actions/setup-ruby-and-rust@v1
+        uses: oxidize-rb/actions/setup-ruby-and-rust@e5f9a49a7812a078584072f6e3f657ad247c8771 # v1
         with:
           ruby-version: "4.0"
           bundler-cache: false # Needed so 'bundler install' doesn't run
@@ -46,7 +46,7 @@ jobs:
           echo "gem-path=$(find pkg -name '*-${{ matrix.rubyPlatform }}.gem')" >> $GITHUB_OUTPUT
 
       - name: Upload gem
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           if-no-files-found: error
           name: ${{ matrix.rubyPlatform }}-gem
@@ -56,12 +56,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           submodules: recursive
 
       - name: Setup Ruby and Rust
-        uses: oxidize-rb/actions/setup-ruby-and-rust@v1
+        uses: oxidize-rb/actions/setup-ruby-and-rust@e5f9a49a7812a078584072f6e3f657ad247c8771 # v1
         with:
           ruby-version: "4.0"
           bundler-cache: true
@@ -80,7 +80,7 @@ jobs:
         run: bundle exec rake build
 
       - name: Upload gem
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: source-gem
           path: temporalio/pkg/*.gem
@@ -118,12 +118,12 @@ jobs:
     container: ${{ matrix.container }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           submodules: recursive
 
       - name: Download gem
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
         with:
           name: ${{ matrix.rubyPlatform }}-gem
           path: local-gem
@@ -131,7 +131,7 @@ jobs:
       # This only works on official runners
       - name: Setup Ruby
         if: ${{ matrix.container == '' }}
-        uses: oxidize-rb/actions/setup-ruby-and-rust@v1
+        uses: oxidize-rb/actions/setup-ruby-and-rust@e5f9a49a7812a078584072f6e3f657ad247c8771 # v1
         with:
           ruby-version: "${{ matrix.rubyVersion }}"
           bundler-cache: true
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e427c737..32e29283 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           submodules: recursive
 
@@ -46,7 +46,7 @@ jobs:
         run: echo "RUBY_CONFIGURE_OPTS=--with-openssl-dir=$(brew --prefix openssl@3.5)" >> $GITHUB_ENV
 
       - name: Setup Ruby and Rust
-        uses: oxidize-rb/actions/setup-ruby-and-rust@v1
+        uses: oxidize-rb/actions/setup-ruby-and-rust@e5f9a49a7812a078584072f6e3f657ad247c8771 # v1
         with:
           ruby-version: ${{ matrix.rubyVersion }}
           bundler-cache: true
@@ -55,12 +55,12 @@ jobs:
 
       # Needed for tests currently
       - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5
         with:
           go-version: stable
 
       - name: Install protoc
-        uses: arduino/setup-protoc@v3
+        uses: arduino/setup-protoc@c65c819552d16ad3c9b72d9dfd5ba5237b9c906b # v3
         with:
           version: "34.x"
           repo-token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/run-bench.yml b/.github/workflows/run-bench.yml
index cf06ed99..50e1aa65 100644
--- a/.github/workflows/run-bench.yml
+++ b/.github/workflows/run-bench.yml
@@ -13,15 +13,15 @@ jobs:
       run:
         working-directory: ./temporalio
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-        with:
-          submodules: recursive
-
-      - name: Setup Ruby and Rust
-        uses: oxidize-rb/actions/setup-ruby-and-rust@v1
-        with:
-          ruby-version: "3.4"
+      - name: Checkout repository
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        with:
+          submodules: recursive
+
+      - name: Setup Ruby and Rust
+        uses: oxidize-rb/actions/setup-ruby-and-rust@e5f9a49a7812a078584072f6e3f657ad247c8771 # v1
+        with:
+          ruby-version: "3.4"
           bundler-cache: true
           cargo-cache: true
           working-directory: ./temporalio