diff --git a/.github/actions/setup-nix/action.yaml b/.github/actions/setup-nix/action.yaml
index 31026679d4..1f41aaf05e 100644
--- a/.github/actions/setup-nix/action.yaml
+++ b/.github/actions/setup-nix/action.yaml
@@ -11,10 +11,10 @@ inputs:
 runs:
   using: composite
   steps:
-    - uses: cachix/install-nix-action@v18
+    - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
       with:
         install_url: https://releases.nixos.org/nix/nix-2.13.3/install
-    - uses: cachix/cachix-action@v12
+    - uses: cachix/cachix-action@18cf96c7c98e048e10a83abd92116114cd8504be # v14
       with:
         name: postgrest
         authToken: ${{ inputs.authToken }}
diff --git a/.github/scripts/arm/docker-env/Dockerfile b/.github/scripts/arm/docker-env/Dockerfile
index 93ec2d4631..f075d9446f 100644
--- a/.github/scripts/arm/docker-env/Dockerfile
+++ b/.github/scripts/arm/docker-env/Dockerfile
@@ -1,6 +1,6 @@
 # PostgREST docker hub image
 
-FROM ubuntu:focal AS postgrest
+FROM ubuntu:jammy@sha256:f9d633ff6640178c2d0525017174a688e2c1aef28f0a0130b26bd5554491f0da AS postgrest
 
 RUN apt-get update -y \
     && apt install -y --no-install-recommends libpq-dev zlib1g-dev jq gcc libnuma-dev \
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 684f21335c..ac21620813 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -17,7 +17,7 @@ jobs:
     name: Lint & check code style
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
         with:
@@ -37,7 +37,7 @@ jobs:
         # https://github.com/actions/runner/issues/241#issuecomment-842566950
         shell: script -qec "bash --noprofile --norc -eo pipefail {0}"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
         with:
@@ -73,7 +73,7 @@ jobs:
         # https://github.com/actions/runner/issues/241#issuecomment-842566950
         shell: script -qec "bash --noprofile --norc -eo pipefail {0}"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
         with:
@@ -92,7 +92,7 @@ jobs:
     name: Test memory (Nix)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
         with:
@@ -105,7 +105,7 @@ jobs:
     name: Build Linux static (Nix)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
         with:
@@ -117,7 +117,7 @@ jobs:
       - name: Check static executable
         run: postgrest-check-static result/bin/postgrest
       - name: Save built executable as artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 # v4
         with:
           name: postgrest-linux-static-x64
           path: result/bin/postgrest
@@ -126,7 +126,7 @@ jobs:
       - name: Build Docker image
         run: nix-build -A docker.image --out-link postgrest-docker.tar.gz
       - name: Save built Docker image as artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 # v4
         with:
           name: postgrest-docker-x64
           path: postgrest-docker.tar.gz
@@ -171,9 +171,9 @@ jobs:
     name: Build ${{ matrix.name }} (Stack)
     runs-on: ${{ matrix.runs-on }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Stack working files cache
-        uses: actions/cache@v3
+        uses: actions/cache@13aacd865c20de90d75de3b17ebe84f7a17d57d2 # v4
         with:
           path: ${{ matrix.cache }}
           key: ${{ runner.os }}-${{ hashFiles('stack.yaml.lock') }}
@@ -183,7 +183,7 @@ jobs:
       - name: Build with Stack
         run: stack build --local-bin-path result --copy-bins
       - name: Save built executable as artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 # v4
         with:
           name: ${{ matrix.artifact }}
           path: |
@@ -195,7 +195,7 @@ jobs:
     name: Get FreeBSD build from CirrusCI
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Get FreeBSD executable from CirrusCI
         env:
           # GITHUB_SHA does weird things for pull request, so we roll our own:
@@ -203,7 +203,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: .github/get_cirrusci_freebsd
       - name: Save executable as artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 # v4
         with:
           name: postgrest-freebsd-x64
           path: postgrest
@@ -217,7 +217,7 @@ jobs:
     name: Build Linux (Cabal, GHC ${{ matrix.ghc }})
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: ghcup
         run: |
           ghcup install ghc ${{ matrix.ghc }}
@@ -226,7 +226,7 @@ jobs:
         run: |
           cp cabal.project.non-nix cabal.project
       - name: Cache
-        uses: actions/cache@v3
+        uses: actions/cache@13aacd865c20de90d75de3b17ebe84f7a17d57d2 # v4
         with:
           path: ~/.cabal
           key: ${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('**/*.cabal') }}-${{ hashFiles('**/cabal.project') }}
@@ -248,7 +248,7 @@ jobs:
     env:
       GITHUB_COMMIT: ${{ github.sha }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - id: Remote-Dir
         name: Unique directory name for the remote build
         run: echo "remotepath=postgrest-build-$(uuidgen)" >> "$GITHUB_OUTPUT"
@@ -288,7 +288,7 @@ jobs:
       - name: Extract downloaded binaries
         run: tar -xvf result.tar.xz && rm result.tar.xz
       - name: Save aarch64 executable as artifact
-        uses: actions/upload-artifact@v2.3.1
+        uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 # v4.3.1
         with:
           name: postgrest-ubuntu-aarch64
           path: result/postgrest
@@ -312,7 +312,7 @@ jobs:
       version: ${{ steps.Identify-Version.outputs.version }}
       isprerelease: ${{ steps.Identify-Version.outputs.isprerelease }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - id: Identify-Version
         name: Identify the version to be released
         run: |
@@ -349,7 +349,7 @@ jobs:
           echo "Relevant extract from CHANGELOG.md:"
           cat CHANGES.md
       - name: Save CHANGES.md as artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 # v4
         with:
           name: release-changes
           path: CHANGES.md
@@ -365,9 +365,9 @@ jobs:
     env:
       VERSION: ${{ needs.Prepare-Release.outputs.version }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Download all artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@eaceaf801fd36c7dee90939fad912460b18a1ffe # v4
         with:
           path: artifacts
       - name: Create release bundle with archives for all builds
@@ -397,7 +397,7 @@ jobs:
             artifacts/postgrest-windows-x64/postgrest.exe
 
       - name: Save release bundle
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 # v4
         with:
           name: release-bundle
           path: release-bundle
@@ -431,13 +431,13 @@ jobs:
       VERSION: ${{ needs.Prepare-Release.outputs.version }}
       ISPRERELEASE: ${{ needs.Prepare-Release.outputs.isprerelease }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
         with:
           tools: release
       - name: Download Docker image
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@eaceaf801fd36c7dee90939fad912460b18a1ffe # v4
         with:
           name: postgrest-docker-x64
       - name: Publish images on Docker Hub
@@ -491,7 +491,7 @@ jobs:
     env:
       REMOTE_DIR: ${{ needs.Build-Cabal-Arm.outputs.remotepath }}
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - name: Remove uploaded files from server
         uses: appleboy/ssh-action@master
         with:
diff --git a/.github/workflows/docs.yaml b/.github/workflows/docs.yaml
index 3319799f99..cdd8a2c4cf 100644
--- a/.github/workflows/docs.yaml
+++ b/.github/workflows/docs.yaml
@@ -15,8 +15,8 @@ jobs:
     name: Build docs
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v22
+    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+    - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
     - run: nix-env -f docs/default.nix -iA build
     - run: postgrest-docs-build
 
@@ -24,8 +24,8 @@ jobs:
     name: Run spellcheck
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v22
+    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+    - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
     - run: nix-env -f docs/default.nix -iA spellcheck
     - run: postgrest-docs-spellcheck
 
@@ -33,8 +33,8 @@ jobs:
     name: Run dictcheck
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: cachix/install-nix-action@v22
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+      - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
       - run: nix-env -f docs/default.nix -iA dictcheck
       - run: postgrest-docs-dictcheck
 
@@ -43,8 +43,8 @@ jobs:
     if: github.base_ref == 'main'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v22
+    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+    - uses: cachix/install-nix-action@6004951b182f8860210c8d6f0d808ec5b1a33d28 # v25
     - run: nix-env -f docs/default.nix -iA linkcheck
     - run: postgrest-docs-linkcheck
     
diff --git a/.github/workflows/loadtest.yaml b/.github/workflows/loadtest.yaml
index b14f7c11b0..5e773c325c 100644
--- a/.github/workflows/loadtest.yaml
+++ b/.github/workflows/loadtest.yaml
@@ -15,7 +15,7 @@ jobs:
     name: Loadtest (Nix)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
         with:
           fetch-depth: 0
       - name: Setup Nix Environment
@@ -27,7 +27,7 @@ jobs:
           postgrest-loadtest-against main
           postgrest-loadtest-report > loadtest/loadtest.md
       - name: Upload report
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 # v4
         with:
           name: loadtest.md
           path: loadtest/loadtest.md
diff --git a/.github/workflows/report.yaml b/.github/workflows/report.yaml
index 7e5e457914..ce5782b56f 100644
--- a/.github/workflows/report.yaml
+++ b/.github/workflows/report.yaml
@@ -22,7 +22,7 @@ jobs:
           name: loadtest.md
           path: artifacts
       - name: Upload to GitHub Checks
-        uses: LouisBrunner/checks-action@v1.5.0
+        uses: LouisBrunner/checks-action@6b626ffbad7cc56fd58627f774b9067e6118af23 # v2.0.0
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           sha: ${{ github.event.workflow_run.head_sha }}