diff --git a/.github/workflows/code_coverage.yml b/.github/workflows/code_coverage.yml
index b29b8017..ad092f96 100644
--- a/.github/workflows/code_coverage.yml
+++ b/.github/workflows/code_coverage.yml
@@ -13,25 +13,25 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
         with:
           persist-credentials: false
 
       - name: Install stable toolchain
-        uses: actions-rs/toolchain@v1
+        uses: actions-rs/toolchain@b2417cde72dcf67f306c0ae8e0828a81bf0b189f
         with:
           toolchain: stable
           override: true
 
       - name: Run cargo-tarpaulin
-        uses: actions-rs/tarpaulin@v0.1
+        uses: actions-rs/tarpaulin@60f0b12e5beec09ccca51758913f82d01889151c
         with:
           timeout: '120'
           out-type: 'Xml'
           args: '-- --test-threads 1'
 
       - name: Upload to codecov.io
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@a1ed4b322b4b38cb846afb5a0ebfa17086917d27
         with:
           token: ${{secrets.CODECOV_TOKEN}}
           fail_ci_if_error: true
\ No newline at end of file
diff --git a/.github/workflows/daily_tests.yml b/.github/workflows/daily_tests.yml
index d21d3837..5f619c65 100644
--- a/.github/workflows/daily_tests.yml
+++ b/.github/workflows/daily_tests.yml
@@ -17,18 +17,18 @@ jobs:
           - nightly
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v2
+        uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
         with:
           persist-credentials: false
 
       - name: Install toolchain
-        uses: actions-rs/toolchain@v1
+        uses: actions-rs/toolchain@b2417cde72dcf67f306c0ae8e0828a81bf0b189f
         with:
           profile: minimal
           toolchain: ${{ matrix.rust }}
           override: true
       - name: Run cargo test - release
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           command: test
           args: --release --all-features
\ No newline at end of file
diff --git a/.github/workflows/lints.yml b/.github/workflows/lints.yml
index 5cb5d9c4..4e2371fe 100644
--- a/.github/workflows/lints.yml
+++ b/.github/workflows/lints.yml
@@ -10,10 +10,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v2
+        uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
 
       - name: Install stable toolchain
-        uses: actions-rs/toolchain@v1
+        uses: actions-rs/toolchain@b2417cde72dcf67f306c0ae8e0828a81bf0b189f
         with:
           profile: minimal
           toolchain: stable
@@ -21,13 +21,13 @@ jobs:
           components: rustfmt, clippy
 
       - name: Run cargo fmt
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           command: fmt
           args: --all -- --check
 
       - name: Run cargo clippy
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           command: clippy
           args: -- -D warnings
\ No newline at end of file
diff --git a/.github/workflows/security_audit.yml b/.github/workflows/security_audit.yml
index 9c176793..f891a0fd 100644
--- a/.github/workflows/security_audit.yml
+++ b/.github/workflows/security_audit.yml
@@ -17,11 +17,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v2
+        uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
         with:
           persist-credentials: false
       - name: Install stable toolchain
-        uses: actions-rs/toolchain@v1
+        uses: actions-rs/toolchain@b2417cde72dcf67f306c0ae8e0828a81bf0b189f
         with:
           toolchain: stable
           override: true
@@ -30,7 +30,7 @@ jobs:
         run: cargo install cargo-audit
 
       - name: Run cargo audit
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           command: audit
           args: --deny warnings
\ No newline at end of file
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6ef845d3..f4900745 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -31,48 +31,48 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v2
+        uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
         with:
           persist-credentials: false
       
       - name: Install toolchain
-        uses: actions-rs/toolchain@v1
+        uses: actions-rs/toolchain@b2417cde72dcf67f306c0ae8e0828a81bf0b189f
         with:
           profile: minimal
           toolchain: ${{ matrix.rust }}
           override: true
       
       - name: Test debug-mode, default features
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           command: test
       
       - name: Test debug-mode, no default features
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           command: test
           args: --no-default-features --tests
       
       - name: Test debug-mode, alloc feature
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           command: test
           args: --no-default-features --features alloc --tests
       
       - name: Test release-mode, default features
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           command: test
           args: --release
       
       - name: Test release-mode, no default features
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           command: test
           args: --release --no-default-features --tests
       
       - name: Test release-mode, alloc feature
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           command: test
           args: --release --no-default-features --features alloc --tests
@@ -83,12 +83,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v2
+        uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
         with:
           persist-credentials: false
 
       - name: Install toolchain
-        uses: actions-rs/toolchain@v1
+        uses: actions-rs/toolchain@b2417cde72dcf67f306c0ae8e0828a81bf0b189f
         with:
           toolchain: nightly
           target: x86_64-unknown-linux-gnu
@@ -108,16 +108,16 @@ jobs:
           - stable
           - nightly
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
       with:
         persist-credentials: false
-    - uses: actions-rs/toolchain@v1
+    - uses: actions-rs/toolchain@b2417cde72dcf67f306c0ae8e0828a81bf0b189f
       with:
         profile: minimal
         toolchain: ${{ matrix.rust }}
         target: thumbv7em-none-eabi
         override: true
-    - uses: actions-rs/cargo@v1
+    - uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
       with:
         use-cross: true
         command: build
@@ -133,15 +133,15 @@ jobs:
           - armv7-unknown-linux-gnueabihf
           - mips64-unknown-linux-gnuabi64
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
         with:
           persist-credentials: false
-      - uses: actions-rs/toolchain@v1
+      - uses: actions-rs/toolchain@b2417cde72dcf67f306c0ae8e0828a81bf0b189f
         with:
           toolchain: stable
           target: ${{ matrix.arch }}
           override: true
-      - uses: actions-rs/cargo@v1
+      - uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           use-cross: true
           command: test
@@ -157,15 +157,15 @@ jobs:
         arch:
           - wasm32-unknown-unknown
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
         with:
           persist-credentials: false
-      - uses: actions-rs/toolchain@v1
+      - uses: actions-rs/toolchain@b2417cde72dcf67f306c0ae8e0828a81bf0b189f
         with:
           toolchain: stable
           target: ${{ matrix.arch }}
           override: true
-      - uses: actions-rs/cargo@v1
+      - uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           command: check
           args: --no-default-features --target ${{ matrix.arch }}
@@ -174,14 +174,14 @@ jobs:
     name: Build documentation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
         with:
           persist-credentials: false
-      - uses: actions-rs/toolchain@v1
+      - uses: actions-rs/toolchain@b2417cde72dcf67f306c0ae8e0828a81bf0b189f
         with:
           toolchain: stable
           override: true
-      - uses: actions-rs/cargo@v1
+      - uses: actions-rs/cargo@ae10961054e4aa8b4aa7dffede299aaf087aa33b
         with:
           command: doc
           args: --no-deps --all-features
@@ -198,9 +198,9 @@ jobs:
     continue-on-error: ${{ matrix.checks == 'advisories' }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
       with:
         persist-credentials: false
-    - uses: EmbarkStudios/cargo-deny-action@v1
+    - uses: EmbarkStudios/cargo-deny-action@0ca727bbae7b7b578b9a5f98186caac35aa2a00d
       with:
         command: check ${{ matrix.checks }}