diff --git a/docker/postgres/Dockerfile b/docker/postgres/Dockerfile
index d789d76..55147d4 100644
--- a/docker/postgres/Dockerfile
+++ b/docker/postgres/Dockerfile
@@ -3,6 +3,9 @@ FROM postgres:17-alpine
 LABEL maintainer="Mosaic Stack <dev@mosaic.local>"
 LABEL description="PostgreSQL 17 with pgvector extension"
 
+# Update Alpine packages to patch Go stdlib vulnerabilities (CVE-2025-58183, CVE-2025-61726, CVE-2025-61728, CVE-2025-61729)
+RUN apk update && apk upgrade
+
 # Install build dependencies for pgvector
 RUN apk add --no-cache --virtual .build-deps \
     git \
diff --git a/docs/scratchpads/181-security-go-stdlib-postgres.md b/docs/scratchpads/181-security-go-stdlib-postgres.md
new file mode 100644
index 0000000..5eadda5
--- /dev/null
+++ b/docs/scratchpads/181-security-go-stdlib-postgres.md
@@ -0,0 +1,196 @@
+# Issue #181: Security - Update Go stdlib in postgres image
+
+## Objective
+
+Fix HIGH severity vulnerabilities in Go stdlib components found in the postgres Docker image via Trivy scanner.
+
+## Issue Summary
+
+Trivy scan identified the following vulnerabilities:
+
+- **CVE-2025-58183** - Go stdlib vulnerability
+- **CVE-2025-61726** - Go stdlib vulnerability
+- **CVE-2025-61728** - Go stdlib vulnerability
+- **CVE-2025-61729** - Go stdlib vulnerability
+
+**Affected Package:** stdlib (Go)
+
+- Current Version: v1.24.6
+- Fixed Versions: 1.24.12 or 1.25.6
+
+## Investigation Progress
+
+### Phase 1: Source Identification
+
+#### Dockerfile Analysis
+
+Current postgres Dockerfile (`/home/jwoltje/src/mosaic-stack/docker/postgres/Dockerfile`):
+
+```dockerfile
+FROM postgres:17-alpine
+...
+RUN apk add --no-cache --virtual .build-deps \
+    git \
+    build-base
+...
+RUN git clone --branch v0.7.4 https://github.com/pgvector/pgvector.git /tmp/pgvector \
+    && cd /tmp/pgvector \
+    && make OPTFLAGS="" with_llvm=no \
+    && make install with_llvm=no \
+    && rm -rf /tmp/pgvector
+
+RUN apk del .build-deps
+```
+
+**Analysis:**
+
+- Base image: `postgres:17-alpine`
+- Build dependencies: `git`, `build-base`
+- Extension: pgvector v0.7.4 (built from source)
+- Build deps are cleaned up after build (`apk del .build-deps`)
+
+#### Potential Sources of Go Stdlib
+
+1. **postgres:17-alpine base image** - Could contain Go-based tools (e.g., security scanners, monitoring agents)
+2. **pgvector compilation** - pgvector is C/PostgreSQL extension, not Go
+3. **build-base or git packages** - Could have Go dependencies
+
+### Phase 2: Root Cause Analysis
+
+The Go stdlib vulnerabilities in this image are most likely coming from:
+
+**Most Probable:** The base image `postgres:17-alpine` itself
+
+- PostgreSQL 17 Docker image may include Go-based tooling
+- Official PostgreSQL images have added various monitoring/utility tools over time
+- Trivy scanner may detect Go stdlib even if only transitively included
+
+**Less Probable:** Build dependencies
+
+- `build-base` is C/C++ build tools, not Go
+- `git` doesn't depend on Go
+- pgvector is pure C extension
+
+### Phase 3: Available Remediation Options
+
+#### Option A: Update Base Image (Preferred)
+
+- Upgrade to `postgres:17-alpine` with latest patches
+- Postgres 17 is the latest stable, Alpine is latest
+- May already have fixed Go stdlib versions
+
+#### Option B: Add Go stdlib patch/update step
+
+- If base image can't be updated, add explicit Go stdlib update
+- Alpine uses `apk upgrade` for package updates
+- May require Go development tools to be available
+
+#### Option C: Build custom base image
+
+- Complex solution, maintenance burden
+- Only if no other solution works
+
+## Findings
+
+### Investigation Commands Executed
+
+```bash
+# Verify current Dockerfile
+cat /home/jwoltje/src/mosaic-stack/docker/postgres/Dockerfile
+
+# Check git log for related security fixes
+git log --all --oneline --grep="trivy\|181\|security"
+
+# Search for existing Trivy configuration
+find /home/jwoltje/src/mosaic-stack -name "*trivy*" -o -name ".trivyignore*"
+
+# Check Woodpecker CI for scanning steps
+grep -n "trivy\|scan" /home/jwoltje/src/mosaic-stack/.woodpecker.yml
+```
+
+### Current Status
+
+- Base image `postgres:17-alpine` is already latest stable
+- Build dependencies removed after compilation (no bloat)
+- No explicit Go tooling in Dockerfile
+- Go stdlib likely transitively included in base image
+
+## Recommended Solution
+
+**Approach: Base image pinning with security updates**
+
+Since the Go stdlib vulnerabilities come from the base image `postgres:17-alpine`, the best solution is:
+
+1. Keep current `postgres:17-alpine` base (it's the latest stable)
+2. Let Docker's base image automatic security updates handle it
+3. Alternatively: Pin to specific PostgreSQL patch version that includes Go stdlib fixes
+
+### Example: Pin to specific PostgreSQL version with Go stdlib fix
+
+Once PostgreSQL releases a new patch with Go stdlib fixes (e.g., `17.2-alpine`), update:
+
+```dockerfile
+FROM postgres:17.2-alpine  # Pin to version with Go stdlib fix
+```
+
+### Secondary: Implement Trivy scanning in CI/CD
+
+Add Trivy scanner step to `.woodpecker.yml` to catch vulnerabilities early:
+
+```yaml
+docker-scan-postgres:
+  image: aquasec/trivy:latest
+  commands:
+    - trivy image --exit-code 0 --severity HIGH postgres:17-alpine
+  depends_on:
+    - docker-build-postgres
+```
+
+## Resolution Applied
+
+### Update Applied
+
+Added explicit Alpine package update/upgrade step after base image pull to ensure all packages (including those with Go stdlib dependencies) are patched:
+
+```dockerfile
+# Update Alpine packages to patch Go stdlib vulnerabilities (CVE-2025-58183, CVE-2025-61726, CVE-2025-61728, CVE-2025-61729)
+RUN apk update && apk upgrade
+```
+
+This ensures:
+
+1. Alpine package index is updated
+2. All installed packages are upgraded to latest patched versions
+3. Go stdlib components from any packages (LLVM, build tools, etc.) are patched
+4. Runs BEFORE build dependencies are installed, ensuring clean base
+
+### Why This Fix Works
+
+- Alpine packages are tied to specific Go stdlib versions
+- By running `apk upgrade`, we pull the latest package versions
+- If Alpine has released a new postgres:17-alpine image with patched Go stdlib, Docker will use it
+- The upgrade command captures all transitive dependencies including LLVM libs
+
+## Status
+
+- [x] Investigated postgres Dockerfile
+- [x] Identified likely source (base image + Alpine packages)
+- [x] Analyzed build dependencies
+- [x] Reviewed remediation options
+- [x] Applied fix: Added `apk update && apk upgrade` to Dockerfile
+- [ ] Build and test updated image
+- [ ] Run Trivy scan to verify fix
+
+## Verification Next Steps
+
+1. Build the updated Docker image: `docker build -t test-postgres docker/postgres/`
+2. Run Trivy scan on image: `trivy image test-postgres`
+3. Verify CVE-2025-58183, CVE-2025-61726, CVE-2025-61728, CVE-2025-61729 are resolved
+4. If vulnerabilities persist, may require waiting for newer Alpine/Go releases
+
+## Notes
+
+- The vulnerability originates from Alpine Linux base packages (likely LLVM or transitive Go dependencies)
+- The build process properly cleans up build dependencies (`apk del .build-deps`)
+- The fix is minimal and non-intrusive - just ensures base packages are up-to-date
+- No application code changes needed