diff --git a/.github/actions/bootstrap/action.yaml b/.github/actions/bootstrap/action.yaml
index b294c90ae9f..8a68cd4972c 100644
--- a/.github/actions/bootstrap/action.yaml
+++ b/.github/actions/bootstrap/action.yaml
@@ -1,4 +1,5 @@
 name: "Bootstrap"
+
 description: "Bootstrap all tools and dependencies"
 inputs:
   go-version:
@@ -24,13 +25,13 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/setup-go@v4
+    - uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe #v4.1.0
       with:
         go-version: ${{ inputs.go-version }}
 
     - name: Restore tool cache
       id: tool-cache
-      uses: actions/cache@v3
+      uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
       with:
         path: ${{ github.workspace }}/.tmp
         key: ${{ inputs.cache-key-prefix }}-${{ runner.os }}-tool-${{ hashFiles('Makefile') }}
@@ -40,7 +41,7 @@ runs:
     - name: Restore go module cache
       id: go-mod-cache
       if: inputs.use-go-cache == 'true'
-      uses: actions/cache@v3
+      uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
       with:
         path: |
           ~/go/pkg/mod
@@ -56,7 +57,7 @@ runs:
     - name: Restore go build cache
       id: go-cache
       if: inputs.use-go-cache == 'true'
-      uses: actions/cache@v3
+      uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
       with:
         path: |
           ~/.cache/go-build
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index eb2c65955e7..271775b7b22 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -1,10 +1,12 @@
 version: 2
 updates:
-  - package-ecosystem: "github-actions"
+  - package-ecosystem: gomod
     directory: "/"
     schedule:
-      interval: daily
-  - package-ecosystem: "gomod"
+      interval: "daily"
+    open-pull-requests-limit: 10
+  - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: daily
+      interval: "daily"
+    open-pull-requests-limit: 10
\ No newline at end of file
diff --git a/.github/workflows/benchmark-testing.yaml b/.github/workflows/benchmark-testing.yaml
index 50f5d390b10..556fc5ab80e 100644
--- a/.github/workflows/benchmark-testing.yaml
+++ b/.github/workflows/benchmark-testing.yaml
@@ -4,6 +4,9 @@ on:
   workflow_dispatch:
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
 
   Benchmark-Test:
@@ -13,13 +16,14 @@ jobs:
     # we also want to run on push such that merges to main are recorded to the cache. For this reason we don't filter
     # the job by event.
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout code
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4.0.0
 
       - name: Bootstrap environment
         uses: ./.github/actions/bootstrap
 
       - name: Restore base benchmark result
-        uses: actions/cache@v3
+        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: test/results/benchmark-main.txt
           # use base sha for PR or new commit hash for main push in benchmark result key
@@ -35,13 +39,13 @@ jobs:
           OUTPUT="${OUTPUT//$'\r'/'%0D'}" # URL encode all '\r' characters
           echo "result=$OUTPUT" >> $GITHUB_OUTPUT
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
         with:
           name: benchmark-test-results
           path: test/results/**/*
 
       - name: Update PR benchmark results comment
-        uses: marocchino/sticky-pull-request-comment@v2
+        uses: marocchino/sticky-pull-request-comment@efaaab3fd41a9c3de579aba759d2552635e590fd #v2.8.0
         continue-on-error: true
         with:
           header: benchmark
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 0b2d988fa8f..eb351aa1a7e 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -14,11 +14,17 @@ on:
   schedule:
     - cron: '0 0 * * 3'
 
+permissions:
+  contents: read
+
 jobs:
   analyze:
     name: Analyze
     runs-on: ubuntu-latest
 
+    permissions:
+      security-events: write
+
     strategy:
       fail-fast: false
       matrix:
@@ -30,16 +36,16 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
 
     - name: Install Go
-      uses: actions/setup-go@v4
+      uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe #v4.1.0
       with:
         go-version-file: go.mod
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
+      uses: github/codeql-action/init@04daf014b50eaf774287bf3f0f1869d4b4c4b913 #v2.21.7
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -50,7 +56,7 @@ jobs:
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: Autobuild
-      uses: github/codeql-action/autobuild@v2
+      uses: github/codeql-action/autobuild@04daf014b50eaf774287bf3f0f1869d4b4c4b913 #v2.21.7
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -64,4 +70,4 @@ jobs:
     #   make release
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
+      uses: github/codeql-action/analyze@04daf014b50eaf774287bf3f0f1869d4b4c4b913 #v2.21.7
diff --git a/.github/workflows/oss-project-board-add.yaml b/.github/workflows/oss-project-board-add.yaml
index b0d1fca007a..0472de8e5de 100644
--- a/.github/workflows/oss-project-board-add.yaml
+++ b/.github/workflows/oss-project-board-add.yaml
@@ -1,5 +1,8 @@
 name: Add to OSS board
 
+permissions:
+  contents: read
+
 on:
   issues:
     types:
@@ -9,7 +12,6 @@ on:
       - labeled
 
 jobs:
-
   run:
     uses: "anchore/workflows/.github/workflows/oss-project-board-add.yaml@main"
     secrets:
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index a76247ccf85..4596748e80e 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -1,4 +1,8 @@
 name: "Release"
+
+permissions:
+  contents: read
+
 on:
   workflow_dispatch:
     inputs:
@@ -14,7 +18,7 @@ jobs:
     environment: release
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
 
       - name: Check if tag already exists
         # note: this will fail if the tag already exists
@@ -23,7 +27,7 @@ jobs:
           git tag ${{ github.event.inputs.version }}
 
       - name: Check static analysis results
-        uses: fountainhead/action-wait-for-check@v1.1.0
+        uses: fountainhead/action-wait-for-check@297be350cf8393728ea4d4b39435c7d7ae167c93 # v1.1.0
         id: static-analysis
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -32,7 +36,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
       - name: Check unit test results
-        uses: fountainhead/action-wait-for-check@v1.1.0
+        uses: fountainhead/action-wait-for-check@297be350cf8393728ea4d4b39435c7d7ae167c93 # v1.1.0
         id: unit
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -41,7 +45,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
       - name: Check integration test results
-        uses: fountainhead/action-wait-for-check@v1.1.0
+        uses: fountainhead/action-wait-for-check@297be350cf8393728ea4d4b39435c7d7ae167c93 # v1.1.0
         id: integration
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -50,7 +54,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
       - name: Check acceptance test results (linux)
-        uses: fountainhead/action-wait-for-check@v1.1.0
+        uses: fountainhead/action-wait-for-check@297be350cf8393728ea4d4b39435c7d7ae167c93 # v1.1.0
         id: acceptance-linux
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -59,7 +63,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
       - name: Check acceptance test results (mac)
-        uses: fountainhead/action-wait-for-check@v1.1.0
+        uses: fountainhead/action-wait-for-check@297be350cf8393728ea4d4b39435c7d7ae167c93 # v1.1.0
         id: acceptance-mac
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -68,7 +72,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
       - name: Check cli test results (linux)
-        uses: fountainhead/action-wait-for-check@v1.1.0
+        uses: fountainhead/action-wait-for-check@297be350cf8393728ea4d4b39435c7d7ae167c93 # v1.1.0
         id: cli-linux
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -94,7 +98,7 @@ jobs:
       contents: write
       packages: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
         with:
           fetch-depth: 0
 
@@ -105,13 +109,13 @@ jobs:
           build-cache-key-prefix: "snapshot"
 
       - name: Login to Docker Hub
-        uses: docker/login-action@v3
+        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d  #v3.0.0
         with:
           username: ${{ secrets.TOOLBOX_DOCKER_USER }}
           password: ${{ secrets.TOOLBOX_DOCKER_PASS }}
 
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d  #v3.0.0
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
@@ -141,12 +145,12 @@ jobs:
           AWS_ACCESS_KEY_ID: ${{ secrets.TOOLBOX_AWS_ACCESS_KEY_ID }}
           AWS_SECRET_ACCESS_KEY: ${{ secrets.TOOLBOX_AWS_SECRET_ACCESS_KEY }}
 
-      - uses: anchore/sbom-action@v0
+      - uses: anchore/sbom-action@78fc58e266e87a38d4194b2137a3d4e9bcaf7ca1 #v0.14.3
         continue-on-error: true
         with:
           artifact-name: sbom.spdx.json
 
-      - uses: 8398a7/action-slack@v3
+      - uses: 8398a7/action-slack@49aa08e51e8782f49c601d79ec72d07fd39a4612 #v3.15.1
         continue-on-error: true
         with:
           status: ${{ job.status }}
@@ -156,7 +160,7 @@ jobs:
           SLACK_WEBHOOK_URL: ${{ secrets.SLACK_TOOLBOX_WEBHOOK_URL }}
         if: ${{ success() }}
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 #v3.1.3
         with:
           name: artifacts
           path: dist/**/*
diff --git a/.github/workflows/update-bootstrap-tools.yml b/.github/workflows/update-bootstrap-tools.yml
index bdf133179e7..7396258f90f 100644
--- a/.github/workflows/update-bootstrap-tools.yml
+++ b/.github/workflows/update-bootstrap-tools.yml
@@ -9,14 +9,17 @@ env:
   GO_VERSION: "1.21.x"
   GO_STABLE_VERSION: true
 
+permissions:
+  contents: read
+
 jobs:
   update-bootstrap-tools:
     runs-on: ubuntu-latest
     if: github.repository == 'anchore/syft' # only run for main repo
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
 
-      - uses: actions/setup-go@v4
+      - uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe #v4.1.0
         with:
           go-version: ${{ env.GO_VERSION }}
           stable: ${{ env.GO_STABLE_VERSION }}
@@ -55,13 +58,13 @@ jobs:
           echo "GLOW=GLOW_LATEST_VERSION" >> $GITHUB_OUTPUT
         id: latest-versions
 
-      - uses: tibdex/github-app-token@v2
+      - uses: tibdex/github-app-token@0914d50df753bbc42180d982a6550f195390069f #v2.0.0
         id: generate-token
         with:
           app_id: ${{ secrets.TOKEN_APP_ID }}
           private_key: ${{ secrets.TOKEN_APP_PRIVATE_KEY }}
 
-      - uses: peter-evans/create-pull-request@v5
+      - uses: peter-evans/create-pull-request@153407881ec5c347639a548ade7d8ad1d6740e38 #v5.0.2
         with:
           signoff: true
           delete-branch: true
diff --git a/.github/workflows/update-cpe-dictionary-index.yml b/.github/workflows/update-cpe-dictionary-index.yml
index fb165929376..c956a80f550 100644
--- a/.github/workflows/update-cpe-dictionary-index.yml
+++ b/.github/workflows/update-cpe-dictionary-index.yml
@@ -5,6 +5,9 @@ on:
 
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 env:
   GO_VERSION: "1.21.x"
   GO_STABLE_VERSION: true
@@ -16,7 +19,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-go@v4
+      - uses: actions/setup-go@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
         with:
           go-version: ${{ env.GO_VERSION }}
           stable: ${{ env.GO_STABLE_VERSION }}
@@ -24,13 +27,13 @@ jobs:
       - run: |
           make generate-cpe-dictionary-index
 
-      - uses: tibdex/github-app-token@v2
+      - uses: tibdex/github-app-token@0914d50df753bbc42180d982a6550f195390069f #v2.0.0
         id: generate-token
         with:
           app_id: ${{ secrets.TOKEN_APP_ID }}
           private_key: ${{ secrets.TOKEN_APP_PRIVATE_KEY }}
 
-      - uses: peter-evans/create-pull-request@v5
+      - uses: peter-evans/create-pull-request@153407881ec5c347639a548ade7d8ad1d6740e38 #v5.0.2
         with:
           signoff: true
           delete-branch: true
diff --git a/.github/workflows/update-stereoscope-release.yml b/.github/workflows/update-stereoscope-release.yml
index bd4e74b5c3e..f1fe9883122 100644
--- a/.github/workflows/update-stereoscope-release.yml
+++ b/.github/workflows/update-stereoscope-release.yml
@@ -9,14 +9,17 @@ env:
   GO_VERSION: "1.21.x"
   GO_STABLE_VERSION: true
 
+permissions:
+  contents: read
+
 jobs:
   upgrade-stereoscope:
     runs-on: ubuntu-latest
     if: github.repository == 'anchore/syft' # only run for main repo
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
 
-      - uses: actions/setup-go@v4
+      - uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe #v4.1.0
         with:
           go-version: ${{ env.GO_VERSION }}
           stable: ${{ env.GO_STABLE_VERSION }}
@@ -32,13 +35,13 @@ jobs:
           echo "LATEST_VERSION=$LATEST_VERSION" >> $GITHUB_OUTPUT
         id: latest-version
 
-      - uses: tibdex/github-app-token@v2
+      - uses: tibdex/github-app-token@0914d50df753bbc42180d982a6550f195390069f #v2.0.0
         id: generate-token
         with:
           app_id: ${{ secrets.TOKEN_APP_ID }}
           private_key: ${{ secrets.TOKEN_APP_PRIVATE_KEY }}
 
-      - uses: peter-evans/create-pull-request@v5
+      - uses: peter-evans/create-pull-request@153407881ec5c347639a548ade7d8ad1d6740e38 #v5.0.2
         with:
           signoff: true
           delete-branch: true
diff --git a/.github/workflows/validations.yaml b/.github/workflows/validations.yaml
index 36502c1332d..8a20bae14a6 100644
--- a/.github/workflows/validations.yaml
+++ b/.github/workflows/validations.yaml
@@ -7,14 +7,16 @@ on:
     branches:
       - main
 
-jobs:
+permissions:
+    contents: read
 
+jobs:
   Static-Analysis:
     # Note: changing this job name requires making the same update in the .github/workflows/release.yaml pipeline
     name: "Static analysis"
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
 
       - name: Bootstrap environment
         uses: ./.github/actions/bootstrap
@@ -28,37 +30,37 @@ jobs:
     name: "Unit tests"
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
 
       - name: Bootstrap environment
         uses: ./.github/actions/bootstrap
 
       - name: Restore Java test-fixture cache
-        uses: actions/cache@v3
+        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: syft/pkg/cataloger/java/test-fixtures/java-builds/packages
           key: ${{ runner.os }}-unit-java-cache-${{ hashFiles( 'syft/pkg/cataloger/java/test-fixtures/java-builds/cache.fingerprint' ) }}
 
       - name: Restore RPM test-fixture cache
-        uses: actions/cache@v3
+        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: syft/pkg/cataloger/rpm/test-fixtures/rpms
           key: ${{ runner.os }}-unit-rpm-cache-${{ hashFiles( 'syft/pkg/cataloger/rpm/test-fixtures/rpms.fingerprint' ) }}
 
       - name: Restore go binary test-fixture cache
-        uses: actions/cache@v3
+        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: syft/pkg/cataloger/golang/test-fixtures/archs/binaries
           key: ${{ runner.os }}-unit-go-binaries-cache-${{ hashFiles( 'syft/pkg/cataloger/golang/test-fixtures/archs/binaries.fingerprint' ) }}
 
       - name: Restore binary cataloger test-fixture cache
-        uses: actions/cache@v3
+        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: syft/pkg/cataloger/binary/test-fixtures/classifiers/dynamic
           key: ${{ runner.os }}-unit-binary-cataloger-cache-${{ hashFiles( 'syft/pkg/cataloger/binary/test-fixtures/cache.fingerprint' ) }}
 
       - name: Restore Kernel test-fixture cache
-        uses: actions/cache@v3
+        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: syft/pkg/cataloger/kernel/test-fixtures/cache
           key: ${{ runner.os }}-unit-kernel-cache-${{ hashFiles( 'syft/pkg/cataloger/kernel/test-fixtures/cache.fingerprint' ) }}
@@ -72,7 +74,7 @@ jobs:
     name: "Integration tests"
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
 
       - name: Bootstrap environment
         uses: ./.github/actions/bootstrap
@@ -81,7 +83,7 @@ jobs:
         run: make validate-cyclonedx-schema
 
       - name: Restore integration test cache
-        uses: actions/cache@v3
+        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: ${{ github.workspace }}/test/integration/test-fixtures/cache
           key: ${{ runner.os }}-integration-test-cache-${{ hashFiles('test/integration/test-fixtures/cache.fingerprint') }}
@@ -94,7 +96,7 @@ jobs:
     name: "Build snapshot artifacts"
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
 
       - name: Bootstrap environment
         uses: ./.github/actions/bootstrap
@@ -113,7 +115,7 @@ jobs:
       # why not use actions/upload-artifact? It is very slow (3 minutes to upload ~600MB of data, vs 10 seconds with this approach).
       # see https://github.com/actions/upload-artifact/issues/199 for more info
       - name: Upload snapshot artifacts
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: snapshot
           key: snapshot-build-${{ github.run_id }}
@@ -125,10 +127,10 @@ jobs:
     needs: [Build-Snapshot-Artifacts]
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
 
       - name: Download snapshot build
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: snapshot
           key: snapshot-build-${{ github.run_id }}
@@ -138,7 +140,7 @@ jobs:
 
       - name: Restore install.sh test image cache
         id: install-test-image-cache
-        uses: actions/cache@v3
+        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: ${{ github.workspace }}/test/install/cache
           key: ${{ runner.os }}-install-test-image-cache-${{ hashFiles('test/install/cache.fingerprint') }}
@@ -161,17 +163,17 @@ jobs:
     needs: [Build-Snapshot-Artifacts]
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
 
       - name: Download snapshot build
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: snapshot
           key: snapshot-build-${{ github.run_id }}
 
       - name: Restore docker image cache for compare testing
         id: mac-compare-testing-cache
-        uses: actions/cache@v3
+        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: image.tar
           key: ${{ runner.os }}-${{ hashFiles('test/compare/mac.sh') }}
@@ -189,19 +191,19 @@ jobs:
     needs: [Build-Snapshot-Artifacts]
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac #v4.0.0
 
       - name: Bootstrap environment
         uses: ./.github/actions/bootstrap
 
       - name: Restore CLI test-fixture cache
-        uses: actions/cache@v3
+        uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: ${{ github.workspace }}/test/cli/test-fixtures/cache
           key: ${{ runner.os }}-cli-test-cache-${{ hashFiles('test/cli/test-fixtures/cache.fingerprint') }}
 
       - name: Download snapshot build
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@704facf57e6136b1bc63b828d79edcd491f0ee84 #v3.3.2
         with:
           path: snapshot
           key: snapshot-build-${{ github.run_id }}
diff --git a/Dockerfile b/Dockerfile
index c93c21fabf3..e922e3d56bb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM gcr.io/distroless/static-debian11:debug AS build
+FROM gcr.io/distroless/static-debian11:debug@sha256:a0a404776dec98be120089ae42bbdfbe48c177921d856937d124d48eb8c0b951 AS build
 
 FROM scratch
 # needed for version check HTTPS request
diff --git a/Dockerfile.debug b/Dockerfile.debug
index 3c1761cf41d..37a657b3fd4 100644
--- a/Dockerfile.debug
+++ b/Dockerfile.debug
@@ -1,4 +1,4 @@
-FROM gcr.io/distroless/static-debian11:debug
+FROM gcr.io/distroless/static-debian11:debug@sha256:a0a404776dec98be120089ae42bbdfbe48c177921d856937d124d48eb8c0b951
 
 # create the /tmp dir, which is needed for image content cache
 WORKDIR /tmp
diff --git a/syft/internal/fileresolver/test-fixtures/image-files-deleted/Dockerfile b/syft/internal/fileresolver/test-fixtures/image-files-deleted/Dockerfile
index 5c5755194f3..10894f94859 100644
--- a/syft/internal/fileresolver/test-fixtures/image-files-deleted/Dockerfile
+++ b/syft/internal/fileresolver/test-fixtures/image-files-deleted/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.17.1 as tools
+FROM alpine:3.17.1@sha256:93d5a28ff72d288d69b5997b8ba47396d2cbb62a72b5d87cd3351094b5d578a0 as tools
 FROM scratch
 COPY --from=tools /bin /bin
 COPY --from=tools /lib /lib
diff --git a/syft/pkg/cataloger/binary/test-fixtures/image-busybox/Dockerfile b/syft/pkg/cataloger/binary/test-fixtures/image-busybox/Dockerfile
index 94b54d2f4fe..5af8c83d12d 100644
--- a/syft/pkg/cataloger/binary/test-fixtures/image-busybox/Dockerfile
+++ b/syft/pkg/cataloger/binary/test-fixtures/image-busybox/Dockerfile
@@ -1 +1 @@
-FROM busybox:1.35
\ No newline at end of file
+FROM busybox:1.35@sha256:7ae8447f3a7f5bccaa765926f25fc038e425cf1b2be6748727bbea9a13102094
diff --git a/test/install/environments/Dockerfile-alpine-3.6 b/test/install/environments/Dockerfile-alpine-3.6
index 982e5402996..f0a5fcf7293 100644
--- a/test/install/environments/Dockerfile-alpine-3.6
+++ b/test/install/environments/Dockerfile-alpine-3.6
@@ -1,2 +1,2 @@
-FROM alpine:3.6
-RUN apk update && apk add python3 wget unzip make ca-certificates
\ No newline at end of file
+FROM alpine:3.6@sha256:66790a2b79e1ea3e1dabac43990c54aca5d1ddf268d9a5a0285e4167c8b24475
+RUN apk update && apk add python3 wget unzip make ca-certificates
diff --git a/test/install/environments/Dockerfile-ubuntu-20.04 b/test/install/environments/Dockerfile-ubuntu-20.04
index dafb64ed73d..07341fc3830 100644
--- a/test/install/environments/Dockerfile-ubuntu-20.04
+++ b/test/install/environments/Dockerfile-ubuntu-20.04
@@ -1,2 +1,2 @@
-FROM ubuntu:20.04
-RUN apt update -y && apt install make python3 curl unzip -y
\ No newline at end of file
+FROM ubuntu:20.04@sha256:33a5cc25d22c45900796a1aca487ad7a7cb09f09ea00b779e3b2026b4fc2faba
+RUN apt update -y && apt install make python3 curl unzip -y
diff --git a/test/integration/test-fixtures/image-distro-id/Dockerfile b/test/integration/test-fixtures/image-distro-id/Dockerfile
index 400d030326f..0983819b3e9 100644
--- a/test/integration/test-fixtures/image-distro-id/Dockerfile
+++ b/test/integration/test-fixtures/image-distro-id/Dockerfile
@@ -1,3 +1,3 @@
-FROM busybox:1.31.1
+FROM busybox:1.31.1@sha256:95cf004f559831017cdf4628aaf1bb30133677be8702a8c5f2994629f637a209
 
 
diff --git a/test/integration/test-fixtures/image-go-bin-arch-coverage/Dockerfile b/test/integration/test-fixtures/image-go-bin-arch-coverage/Dockerfile
index 7b252568c8c..6bf28daaafd 100644
--- a/test/integration/test-fixtures/image-go-bin-arch-coverage/Dockerfile
+++ b/test/integration/test-fixtures/image-go-bin-arch-coverage/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:latest as builder
+FROM golang:1.21.1@sha256:cffaba795c36f07e372c7191b35ceaae114d74c31c3763d442982e3a4df3b39e as builder
 WORKDIR /app
 COPY go.sum go.mod app.go ./
 
diff --git a/test/integration/test-fixtures/image-java-no-main-package/Dockerfile b/test/integration/test-fixtures/image-java-no-main-package/Dockerfile
index 7e1ac4de7ec..dce8deba3e2 100644
--- a/test/integration/test-fixtures/image-java-no-main-package/Dockerfile
+++ b/test/integration/test-fixtures/image-java-no-main-package/Dockerfile
@@ -1,4 +1,4 @@
-FROM jenkins/jenkins:2.346.3-slim-jdk17
+FROM jenkins/jenkins:2.346.3-slim-jdk17@sha256:028fbbd9112c60ed086f5197fcba71992317864d27644e5949cf9c52ff4b65f0
 
 USER root
 
diff --git a/test/integration/test-fixtures/image-java-virtualpath-regression/Dockerfile b/test/integration/test-fixtures/image-java-virtualpath-regression/Dockerfile
index a8d70f16a83..63fc6c92aad 100644
--- a/test/integration/test-fixtures/image-java-virtualpath-regression/Dockerfile
+++ b/test/integration/test-fixtures/image-java-virtualpath-regression/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:latest
+FROM alpine:3.18.3@sha256:7144f7bab3d4c2648d7e59409f15ec52a18006a128c733fcff20d3a4a54ba44a
 
 RUN wget https://repo1.maven.org/maven2/org/jvnet/hudson/main/hudson-war/2.2.1/hudson-war-2.2.1.war
 
diff --git a/test/integration/test-fixtures/image-os-binary-overlap/Dockerfile b/test/integration/test-fixtures/image-os-binary-overlap/Dockerfile
index 0951649a3cc..21c4d8479a9 100644
--- a/test/integration/test-fixtures/image-os-binary-overlap/Dockerfile
+++ b/test/integration/test-fixtures/image-os-binary-overlap/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:latest
+FROM alpine:3.18.3@sha256:7144f7bab3d4c2648d7e59409f15ec52a18006a128c733fcff20d3a4a54ba44a
 
 # syft should not longer show the binary package for this image:
 # https://github.com/anchore/syft/issues/931
diff --git a/test/integration/test-fixtures/image-owning-package/Dockerfile b/test/integration/test-fixtures/image-owning-package/Dockerfile
index 37346c9c790..192998626e9 100644
--- a/test/integration/test-fixtures/image-owning-package/Dockerfile
+++ b/test/integration/test-fixtures/image-owning-package/Dockerfile
@@ -1,3 +1,3 @@
-FROM ubuntu:20.04
+FROM ubuntu:20.04@sha256:33a5cc25d22c45900796a1aca487ad7a7cb09f09ea00b779e3b2026b4fc2faba
 # this covers rpm-python
-RUN apt-get update && apt-get install -y python-pil=6.2.1-3
\ No newline at end of file
+RUN apt-get update && apt-get install -y python-pil=6.2.1-3
diff --git a/test/integration/test-fixtures/image-photon-all-layers/Dockerfile b/test/integration/test-fixtures/image-photon-all-layers/Dockerfile
index ab09f97ad4b..17bb3691b4c 100644
--- a/test/integration/test-fixtures/image-photon-all-layers/Dockerfile
+++ b/test/integration/test-fixtures/image-photon-all-layers/Dockerfile
@@ -1 +1 @@
-FROM photon:5.0-20230729
+FROM photon:5.0-20230729@sha256:4cf2a1ce0a3f4625f13a0becb6b9bccfdb014c565be6e9a2ec4c4aad1ff8a5d9
diff --git a/test/integration/test-fixtures/image-rust-auditable/Dockerfile b/test/integration/test-fixtures/image-rust-auditable/Dockerfile
index a35897003b9..64540e99fcd 100644
--- a/test/integration/test-fixtures/image-rust-auditable/Dockerfile
+++ b/test/integration/test-fixtures/image-rust-auditable/Dockerfile
@@ -1,2 +1,2 @@
 # An image containing the example hello-auditable binary from https://github.com/Shnatsel/rust-audit/tree/master/hello-auditable
-FROM docker.io/tofay/hello-rust-auditable:latest
+FROM docker.io/tofay/hello-rust-auditable@sha256:1d35d1e007180b3f7500aae5e27560697909132ca9a6d480c4c825534c1c47a9
diff --git a/test/integration/test-fixtures/image-suse-all-layers/Dockerfile b/test/integration/test-fixtures/image-suse-all-layers/Dockerfile
index c8d708b5938..339983d8800 100644
--- a/test/integration/test-fixtures/image-suse-all-layers/Dockerfile
+++ b/test/integration/test-fixtures/image-suse-all-layers/Dockerfile
@@ -1,2 +1,2 @@
-FROM registry.suse.com/suse/sle15:15.3.17.20.20
+FROM registry.suse.com/suse/sle15:15.3.17.20.20@sha256:fd657ecbab5ca564d6933e887f6ae8542a9398e6a4b399f352ce10c3a24afc64
 RUN zypper in -y wget
diff --git a/test/integration/test-fixtures/image-vertical-package-dups/Dockerfile b/test/integration/test-fixtures/image-vertical-package-dups/Dockerfile
index 8f4f2a3a6d1..cd0e69b5de8 100644
--- a/test/integration/test-fixtures/image-vertical-package-dups/Dockerfile
+++ b/test/integration/test-fixtures/image-vertical-package-dups/Dockerfile
@@ -1,6 +1,6 @@
-FROM centos:7.9.2009
+FROM centos:7.9.2009@sha256:be65f488b7764ad3638f236b7b515b3678369a5124c47b8d32916d6487418ea4
 # modifying the RPM DB multiple times will result in duplicate packages when using all-layers (if there was no de-dup logic)
 # curl is tricky, it already exists in the image and is being upgraded
 RUN yum install -y wget-1.14-18.el7_6.1 curl-7.29.0-59.el7_9.1
 RUN yum install -y vsftpd-3.0.2-29.el7_9
-RUN yum install -y httpd-2.4.6-97.el7.centos.5
\ No newline at end of file
+RUN yum install -y httpd-2.4.6-97.el7.centos.5