diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 47f860743..0606ee8fe 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -424,6 +424,12 @@ compile-services:
   script:
     - mkdir -p "$SCCACHE_DIR" && sccache --zero-stats || true
     - PROFILE=${DEV_RELEASE:+dev-release}; PROFILE=${PROFILE:-release}
+    - |
+      # CalVer: YYYY.MM.<pipeline_iid>
+      YEAR=$(date -d "$CI_COMMIT_TIMESTAMP" +%Y 2>/dev/null || date +%Y)
+      MONTH=$(date -d "$CI_COMMIT_TIMESTAMP" +%m 2>/dev/null || date +%m)
+      export FOXHUNT_BUILD_VERSION="${YEAR}.${MONTH}.${CI_PIPELINE_IID:-0}"
+      echo "Build version: $FOXHUNT_BUILD_VERSION"
     - echo "Building services with --profile $PROFILE (CPU-only, no CUDA)"
     - TARGET_DIR="target/$PROFILE"
     - cargo build --profile $PROFILE
@@ -480,6 +486,12 @@ compile-training:
     - export SCCACHE_DIR="/mnt/sccache/sm_${CUDA_COMPUTE_CAP}"
     - mkdir -p "$SCCACHE_DIR" && sccache --zero-stats || true
     - PROFILE=${DEV_RELEASE:+dev-release}; PROFILE=${PROFILE:-release}
+    - |
+      # CalVer: YYYY.MM.<pipeline_iid>
+      YEAR=$(date -d "$CI_COMMIT_TIMESTAMP" +%Y 2>/dev/null || date +%Y)
+      MONTH=$(date -d "$CI_COMMIT_TIMESTAMP" +%m 2>/dev/null || date +%m)
+      export FOXHUNT_BUILD_VERSION="${YEAR}.${MONTH}.${CI_PIPELINE_IID:-0}"
+      echo "Build version: $FOXHUNT_BUILD_VERSION"
     - echo "Building training binaries with --profile $PROFILE (CUDA stubs)"
     - TARGET_DIR="target/$PROFILE"
     - cargo build --profile $PROFILE -p ml --features ml/cuda