diff --git a/.github/skills/examples/gorm-scanner-ci-workflow.yml b/.github/skills/examples/gorm-scanner-ci-workflow.yml
index e78db0af..5ad33920 100644
--- a/.github/skills/examples/gorm-scanner-ci-workflow.yml
+++ b/.github/skills/examples/gorm-scanner-ci-workflow.yml
@@ -25,7 +25,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: "1.26.1"
 
       - name: Run GORM Security Scanner
         id: gorm-scan
diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 74033665..ac08cb3f 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -37,7 +37,8 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version: "1.26.1"
+
           cache-dependency-path: backend/go.sum
 
       - name: Run Benchmark
diff --git a/.github/workflows/codecov-upload.yml b/.github/workflows/codecov-upload.yml
index 639c9888..43aec063 100644
--- a/.github/workflows/codecov-upload.yml
+++ b/.github/workflows/codecov-upload.yml
@@ -47,7 +47,8 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version: "1.26.1"
+
           cache-dependency-path: backend/go.sum
 
       # SECURITY: Keep pull_request (not pull_request_target) for secret-bearing backend tests.
diff --git a/.github/workflows/e2e-tests-split.yml b/.github/workflows/e2e-tests-split.yml
index 528b3654..4dbed110 100644
--- a/.github/workflows/e2e-tests-split.yml
+++ b/.github/workflows/e2e-tests-split.yml
@@ -144,7 +144,8 @@ jobs:
         if: steps.resolve-image.outputs.image_source == 'build'
         uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version: "1.26.1"
+
           cache: true
           cache-dependency-path: backend/go.sum
 
diff --git a/.github/workflows/quality-checks.yml b/.github/workflows/quality-checks.yml
index 7dbc8efa..6feb7b60 100644
--- a/.github/workflows/quality-checks.yml
+++ b/.github/workflows/quality-checks.yml
@@ -33,7 +33,8 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6.3.0
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version: "1.26.1"
+
           cache-dependency-path: backend/go.sum
 
       - name: Run auth protection contract tests
@@ -139,7 +140,8 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6.3.0
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version: "1.26.1"
+
           cache-dependency-path: backend/go.sum
 
       - name: Repo health check
diff --git a/.github/workflows/release-goreleaser.yml b/.github/workflows/release-goreleaser.yml
index 3e6ba74a..3c201c9f 100644
--- a/.github/workflows/release-goreleaser.yml
+++ b/.github/workflows/release-goreleaser.yml
@@ -47,7 +47,8 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version: "1.26.1"
+
           cache-dependency-path: backend/go.sum
 
       - name: Set up Node.js
diff --git a/docs/plans/archive/go_version_management_strategy.md b/docs/plans/archive/go_version_management_strategy.md
index 2b998a48..9a28d572 100644
--- a/docs/plans/archive/go_version_management_strategy.md
+++ b/docs/plans/archive/go_version_management_strategy.md
@@ -174,7 +174,8 @@ golangci-lint has version 2.8.1 built with go1.26.0
 ```yaml
 - uses: actions/setup-go@v6
   with:
-    go-version: ${{ env.GO_VERSION }}
+    go-version: "1.26.1"
+
     cache: true  # Caches Go modules and build artifacts
 ```
 
diff --git a/docs/plans/archive/nightly_branch_implementation.md b/docs/plans/archive/nightly_branch_implementation.md
index 6654a9c2..fa1e3dd2 100644
--- a/docs/plans/archive/nightly_branch_implementation.md
+++ b/docs/plans/archive/nightly_branch_implementation.md
@@ -442,7 +442,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: "1.26.1"
 
       - name: Set up Node.js
         uses: actions/setup-node@v4
diff --git a/docs/plans/proof-of-concept/test-backend-coverage.SKILL.md b/docs/plans/proof-of-concept/test-backend-coverage.SKILL.md
index c0ae0c87..381feb08 100644
--- a/docs/plans/proof-of-concept/test-backend-coverage.SKILL.md
+++ b/docs/plans/proof-of-concept/test-backend-coverage.SKILL.md
@@ -364,7 +364,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: "1.26.1"
       - name: Run Backend Tests with Coverage
         run: .github/skills/scripts/skill-runner.sh test-backend-coverage
 ```