diff --git a/.github/config/image/lambda/base-preview.yml b/.github/config/image/lambda/base-preview.yml
index 81fb1d952938..07c0dd51b8da 100644
--- a/.github/config/image/lambda/base-preview.yml
+++ b/.github/config/image/lambda/base-preview.yml
@@ -1,6 +1,6 @@
 image:
   name: "lambda-base-preview"
-  description: "Lambda base GPU image with thread-mode RIC preview"
+  description: "Lambda base GPU image with multi-mode concurrency RIC"
 
 metadata:
   framework: "lambda"
@@ -19,6 +19,8 @@ build:
   cuda_version: "12.9.1"
   dlc_major_version: "1"
   dlc_minor_version: "0"
+  awslambdaric_version: "3.1.1"
+  awslambdaric_release: "2.0.0.0"
 
 release:
   release: true
diff --git a/.github/config/image/lambda/cupy-preview.yml b/.github/config/image/lambda/cupy-preview.yml
index 66be90f22839..f852f7b4cada 100644
--- a/.github/config/image/lambda/cupy-preview.yml
+++ b/.github/config/image/lambda/cupy-preview.yml
@@ -1,6 +1,6 @@
 image:
   name: "lambda-cupy-preview"
-  description: "Lambda CuPy GPU image with thread-mode RIC preview"
+  description: "Lambda CuPy GPU image with multi-mode concurrency RIC"
 
 metadata:
   framework: "lambda"
@@ -19,6 +19,8 @@ build:
   cuda_version: "12.9.1"
   dlc_major_version: "1"
   dlc_minor_version: "0"
+  awslambdaric_version: "3.1.1"
+  awslambdaric_release: "2.0.0.0"
 
 release:
   release: true
diff --git a/.github/config/image/lambda/pytorch-preview.yml b/.github/config/image/lambda/pytorch-preview.yml
index ed80993ab729..dc20dd995435 100644
--- a/.github/config/image/lambda/pytorch-preview.yml
+++ b/.github/config/image/lambda/pytorch-preview.yml
@@ -1,6 +1,6 @@
 image:
   name: "lambda-pytorch-preview"
-  description: "Lambda PyTorch GPU image with thread-mode RIC preview"
+  description: "Lambda PyTorch GPU image with multi-mode concurrency RIC"
 
 metadata:
   framework: "lambda"
@@ -19,6 +19,8 @@ build:
   cuda_version: "12.9.1"
   dlc_major_version: "1"
   dlc_minor_version: "0"
+  awslambdaric_version: "3.1.1"
+  awslambdaric_release: "2.0.0.0"
 
 release:
   release: true
diff --git a/.github/workflows/lambda.pipeline.yml b/.github/workflows/lambda.pipeline.yml
index 9c549414313f..c44fafcf0bd8 100644
--- a/.github/workflows/lambda.pipeline.yml
+++ b/.github/workflows/lambda.pipeline.yml
@@ -158,6 +158,12 @@ jobs:
               TESTS="$COMMON /test/unit/test_imports_base.py" ;;
           esac
           echo "tests=${TESTS}" >> $GITHUB_OUTPUT
+          # Multi-mode RIC targets carry a runtime concurrency-mode knob.
+          if [[ "$TARGET" == *preview* ]]; then
+            echo "multimode=true" >> $GITHUB_OUTPUT
+          else
+            echo "multimode=false" >> $GITHUB_OUTPUT
+          fi
 
       - name: Run GPU validation tests
         if: steps.check.outputs.exists == 'true'
@@ -167,9 +173,19 @@ jobs:
             ${{ steps.image.outputs.image-uri }} \
             -m pytest ${{ steps.config.outputs.tests }} -v
 
-      - name: Skip notice
-        if: steps.check.outputs.exists != 'true'
-        run: echo "Image not found in ECR — skipping tests (first release scenario)"
+      - name: Verify runtime concurrency-mode override
+        if: steps.check.outputs.exists == 'true' && steps.config.outputs.multimode == 'true'
+        run: |
+          for mode in process thread hybrid; do
+            echo "::group::override AWS_LAMBDA_CONCURRENCY_MODE=${mode}"
+            docker run --rm --gpus all --entrypoint python \
+              -e AWS_LAMBDA_CONCURRENCY_MODE=${mode} \
+              -e EXPECTED_CONCURRENCY_MODE=${mode} \
+              -v $(pwd)/test/lambda:/test \
+              ${{ steps.image.outputs.image-uri }} \
+              -m pytest /test/unit/test_lambda_runtime.py::test_ric_resolves_container_env -v
+            echo "::endgroup::"
+          done
 
   release-gate:
     if: >-
diff --git a/docker/lambda/Dockerfile b/docker/lambda/Dockerfile
index 26a5c0ebd843..6dc54d0dfb36 100644
--- a/docker/lambda/Dockerfile
+++ b/docker/lambda/Dockerfile
@@ -144,13 +144,13 @@ RUN --mount=type=cache,target=/root/.cache/uv \
 # ============================================================
 FROM nvidia/cuda:${CUDA_VERSION}-runtime-amzn2023 as oss-base-py3
 COPY --from=builder-base-py3 /var/lang /var/lang
-COPY ./scripts/common/setup_oss_compliance.sh /tmp/setup_oss_compliance.sh
+COPY ./scripts/docker/common/setup_oss_compliance.sh /tmp/setup_oss_compliance.sh
 RUN PATH="/var/lang/bin:$PATH" bash /tmp/setup_oss_compliance.sh python3 \
   && touch /root/THIRD_PARTY_SOURCE_CODE_URLS
 
 FROM nvidia/cuda:${CUDA_VERSION}-runtime-amzn2023 as oss-cupy-py3
 COPY --from=builder-cupy-py3 /var/lang /var/lang
-COPY ./scripts/common/setup_oss_compliance.sh /tmp/setup_oss_compliance.sh
+COPY ./scripts/docker/common/setup_oss_compliance.sh /tmp/setup_oss_compliance.sh
 RUN PATH="/var/lang/bin:$PATH" bash /tmp/setup_oss_compliance.sh python3 \
   && touch /root/THIRD_PARTY_SOURCE_CODE_URLS
 
@@ -158,7 +158,7 @@ FROM nvidia/cuda:${CUDA_VERSION}-runtime-amzn2023 as oss-pytorch-py3
 ARG FFMPEG_VERSION
 COPY --from=builder-pytorch-py3 /var/lang /var/lang
 COPY --from=lambda-python /lib64/libssl.so.3 /lib64/libcrypto.so.3 /lib64/
-COPY ./scripts/common/setup_oss_compliance.sh /tmp/setup_oss_compliance.sh
+COPY ./scripts/docker/common/setup_oss_compliance.sh /tmp/setup_oss_compliance.sh
 RUN PATH="/var/lang/bin:$PATH" bash /tmp/setup_oss_compliance.sh python3 \
   && printf '\n** FFmpeg; version n%s -- https://github.com/FFmpeg/FFmpeg/archive/refs/tags/n%s.tar.gz\n' "${FFMPEG_VERSION}" "${FFMPEG_VERSION}" >> /root/BUILD_FROM_SOURCE_PACKAGES_LICENCES \
   && printf '\nFFmpeg n%s https://github.com/FFmpeg/FFmpeg/archive/refs/tags/n%s.tar.gz\n' "${FFMPEG_VERSION}" "${FFMPEG_VERSION}" >> /root/THIRD_PARTY_SOURCE_CODE_URLS \
@@ -192,8 +192,8 @@ ENV PATH="/var/lang/bin:$PATH" \
   LAMBDA_RUNTIME_DIR=/var/runtime \
   LANG=en_US.UTF-8 \
   TZ=:/etc/localtime
-COPY ./scripts/telemetry/deep_learning_container.py /usr/local/bin/deep_learning_container.py
-COPY ./scripts/telemetry/bash_telemetry.sh.template /tmp/bash_telemetry.sh.template
+COPY ./scripts/docker/telemetry/deep_learning_container.py /usr/local/bin/deep_learning_container.py
+COPY ./scripts/docker/telemetry/bash_telemetry.sh.template /tmp/bash_telemetry.sh.template
 ARG FRAMEWORK
 ARG FRAMEWORK_VERSION
 ARG CONTAINER_TYPE
@@ -244,8 +244,8 @@ ENV PATH="/var/lang/bin:$PATH" \
   LAMBDA_RUNTIME_DIR=/var/runtime \
   LANG=en_US.UTF-8 \
   TZ=:/etc/localtime
-COPY ./scripts/telemetry/deep_learning_container.py /usr/local/bin/deep_learning_container.py
-COPY ./scripts/telemetry/bash_telemetry.sh.template /tmp/bash_telemetry.sh.template
+COPY ./scripts/docker/telemetry/deep_learning_container.py /usr/local/bin/deep_learning_container.py
+COPY ./scripts/docker/telemetry/bash_telemetry.sh.template /tmp/bash_telemetry.sh.template
 ARG FRAMEWORK
 
 ARG FRAMEWORK_VERSION
@@ -304,8 +304,8 @@ ENV PATH="/var/lang/bin:/usr/local/bin:$PATH" \
   LAMBDA_RUNTIME_DIR=/var/runtime \
   LANG=en_US.UTF-8 \
   TZ=:/etc/localtime
-COPY ./scripts/telemetry/deep_learning_container.py /usr/local/bin/deep_learning_container.py
-COPY ./scripts/telemetry/bash_telemetry.sh.template /tmp/bash_telemetry.sh.template
+COPY ./scripts/docker/telemetry/deep_learning_container.py /usr/local/bin/deep_learning_container.py
+COPY ./scripts/docker/telemetry/bash_telemetry.sh.template /tmp/bash_telemetry.sh.template
 ARG FRAMEWORK
 ARG FRAMEWORK_VERSION
 ARG CONTAINER_TYPE
@@ -330,7 +330,7 @@ ENTRYPOINT ["/lambda_entrypoint.sh", "python", "-m", "awslambdaric"]
 CMD ["handler.handler"]
 
 # ============================================================
-# RIC preview builder (compile thread-mode RIC with C extensions)
+# RIC builder (compile multi-mode concurrency RIC with C extensions)
 # ============================================================
 FROM builder-base as builder-ric-preview
 ARG PYTHON_VERSION
@@ -349,31 +349,46 @@ RUN uv pip install --python /var/lang/bin/python${PYTHON_VERSION} --no-deps /tmp
   && rm /tmp/awslambdaric-${AWSLAMBDARIC_VERSION}.tar.gz
 
 # ============================================================
-# Preview: Base Python 3.13 (+ thread-mode RIC)
+# Base Python 3.13 (+ multi-mode concurrency RIC)
 # ============================================================
 FROM base-py3 as base-preview-py3
 ARG PYTHON_VERSION
 RUN rm -rf /var/lang/lib/python${PYTHON_VERSION}/site-packages/awslambdaric* \
   && rm -f /var/lang/lib/python${PYTHON_VERSION}/site-packages/runtime_client*.so
 COPY --from=builder-ric-preview /var/lang/lib/python${PYTHON_VERSION}/site-packages/ /var/lang/lib/python${PYTHON_VERSION}/site-packages/
-ENV AWS_LAMBDA_CONCURRENCY_MODE=thread
+# Default: process mode (RIC-native). Customers override per function at runtime
+# to thread (one shared model copy in GPU VRAM) or hybrid; function-config env
+# vars take precedence over this image default. In process/hybrid, VRAM scales
+# with worker count (one model copy + CUDA context per process) — size function
+# concurrency to the model's VRAM footprint.
+ENV AWS_LAMBDA_CONCURRENCY_MODE=process
 
 # ============================================================
-# Preview: CuPy Python 3.13 (+ thread-mode RIC)
+# CuPy Python 3.13 (+ multi-mode concurrency RIC)
 # ============================================================
 FROM cupy-py3 as cupy-preview-py3
 ARG PYTHON_VERSION
 RUN rm -rf /var/lang/lib/python${PYTHON_VERSION}/site-packages/awslambdaric* \
   && rm -f /var/lang/lib/python${PYTHON_VERSION}/site-packages/runtime_client*.so
 COPY --from=builder-ric-preview /var/lang/lib/python${PYTHON_VERSION}/site-packages/ /var/lang/lib/python${PYTHON_VERSION}/site-packages/
-ENV AWS_LAMBDA_CONCURRENCY_MODE=thread
+# Default: process mode (RIC-native). Customers override per function at runtime
+# to thread (one shared model copy in GPU VRAM) or hybrid; function-config env
+# vars take precedence over this image default. In process/hybrid, VRAM scales
+# with worker count (one model copy + CUDA context per process) — size function
+# concurrency to the model's VRAM footprint.
+ENV AWS_LAMBDA_CONCURRENCY_MODE=process
 
 # ============================================================
-# Preview: PyTorch Python 3.13 (+ thread-mode RIC)
+# PyTorch Python 3.13 (+ multi-mode concurrency RIC)
 # ============================================================
 FROM pytorch-py3 as pytorch-preview-py3
 ARG PYTHON_VERSION
 RUN rm -rf /var/lang/lib/python${PYTHON_VERSION}/site-packages/awslambdaric* \
   && rm -f /var/lang/lib/python${PYTHON_VERSION}/site-packages/runtime_client*.so
 COPY --from=builder-ric-preview /var/lang/lib/python${PYTHON_VERSION}/site-packages/ /var/lang/lib/python${PYTHON_VERSION}/site-packages/
-ENV AWS_LAMBDA_CONCURRENCY_MODE=thread
\ No newline at end of file
+# Default: process mode (RIC-native). Customers override per function at runtime
+# to thread (one shared model copy in GPU VRAM) or hybrid; function-config env
+# vars take precedence over this image default. In process/hybrid, VRAM scales
+# with worker count (one model copy + CUDA context per process) — size function
+# concurrency to the model's VRAM footprint.
+ENV AWS_LAMBDA_CONCURRENCY_MODE=process
\ No newline at end of file
diff --git a/docker/lambda/pytorch/pyproject.toml b/docker/lambda/pytorch/pyproject.toml
index 957f75a28897..0b925ae62987 100644
--- a/docker/lambda/pytorch/pyproject.toml
+++ b/docker/lambda/pytorch/pyproject.toml
@@ -7,11 +7,13 @@ dependencies = [
     "av==16.1.0",
     "awslambdaric==4.0.0",
     "boto3==1.40.4",
+    "click==8.3.3",
     "diffusers==0.38.0",
     "librosa==0.11.0",
+    "msgpack==1.2.1",
     "numpy==2.4.2",
     "opencv-python-headless==4.13.0.92",
-    "pillow==12.2.0",
+    "pillow==12.3.0",
     "pip==26.0.1",
     "pip-licenses==5.5.1",
     "requests==2.33.0",
@@ -24,7 +26,7 @@ dependencies = [
     "torch==2.10.0",
     "torchaudio==2.10.0",
     "torchvision==0.25.0",
-    "transformers==5.2.0",
+    "transformers==5.5.0",
     "urllib3==2.7.0",
     "pytest==8.4.1",
 ]
diff --git a/docker/lambda/pytorch/uv.lock b/docker/lambda/pytorch/uv.lock
index b17657a1a211..c3810c0c1567 100644
--- a/docker/lambda/pytorch/uv.lock
+++ b/docker/lambda/pytorch/uv.lock
@@ -225,14 +225,14 @@ wheels = [
 
 [[package]]
 name = "click"
-version = "8.3.1"
+version = "8.3.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "colorama", marker = "sys_platform == 'win32'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/3d/fa/656b739db8587d7b5dfa22e22ed02566950fbfbcdc20311993483657a5c0/click-8.3.1.tar.gz", hash = "sha256:12ff4785d337a1bb490bb7e9c2b1ee5da3112e94a8622f26a6c77f5d2fc6842a", size = 295065, upload-time = "2025-11-15T20:45:42.706Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/bb/63/f9e1ea081ce35720d8b92acde70daaedace594dc93b693c869e0d5910718/click-8.3.3.tar.gz", hash = "sha256:398329ad4837b2ff7cbe1dd166a4c0f8900c3ca3a218de04466f38f6497f18a2", size = 328061, upload-time = "2026-04-22T15:11:27.506Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/98/78/01c019cdb5d6498122777c1a43056ebb3ebfeef2076d9d026bfe15583b2b/click-8.3.1-py3-none-any.whl", hash = "sha256:981153a64e25f12d547d3426c367a4857371575ee7ad18df2a6183ab0545b2a6", size = 108274, upload-time = "2025-11-15T20:45:41.139Z" },
+    { url = "https://files.pythonhosted.org/packages/ae/44/c1221527f6a71a01ec6fbad7fa78f1d50dfa02217385cf0fa3eec7087d59/click-8.3.3-py3-none-any.whl", hash = "sha256:a2bf429bb3033c89fa4936ffb35d5cb471e3719e1f3c8a7c3fff0b8314305613", size = 110502, upload-time = "2026-04-22T15:11:25.044Z" },
 ]
 
 [[package]]
@@ -488,8 +488,10 @@ dependencies = [
     { name = "av" },
     { name = "awslambdaric" },
     { name = "boto3" },
+    { name = "click" },
     { name = "diffusers" },
     { name = "librosa" },
+    { name = "msgpack" },
     { name = "numpy" },
     { name = "opencv-python-headless" },
     { name = "pillow" },
@@ -516,11 +518,13 @@ requires-dist = [
     { name = "av", specifier = "==16.1.0" },
     { name = "awslambdaric", specifier = "==4.0.0" },
     { name = "boto3", specifier = "==1.40.4" },
+    { name = "click", specifier = "==8.3.3" },
     { name = "diffusers", specifier = "==0.38.0" },
     { name = "librosa", specifier = "==0.11.0" },
+    { name = "msgpack", specifier = "==1.2.1" },
     { name = "numpy", specifier = "==2.4.2" },
     { name = "opencv-python-headless", specifier = "==4.13.0.92" },
-    { name = "pillow", specifier = "==12.2.0" },
+    { name = "pillow", specifier = "==12.3.0" },
     { name = "pip", specifier = "==26.0.1" },
     { name = "pip-licenses", specifier = "==5.5.1" },
     { name = "pytest", specifier = "==8.4.1" },
@@ -534,7 +538,7 @@ requires-dist = [
     { name = "torch", specifier = "==2.10.0", index = "https://download.pytorch.org/whl/cu129" },
     { name = "torchaudio", specifier = "==2.10.0", index = "https://download.pytorch.org/whl/cu129" },
     { name = "torchvision", specifier = "==0.25.0", index = "https://download.pytorch.org/whl/cu129" },
-    { name = "transformers", specifier = "==5.2.0" },
+    { name = "transformers", specifier = "==5.5.0" },
     { name = "urllib3", specifier = "==2.7.0" },
 ]
 
@@ -650,19 +654,21 @@ wheels = [
 
 [[package]]
 name = "msgpack"
-version = "1.1.2"
+version = "1.2.1"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/4d/f2/bfb55a6236ed8725a96b0aa3acbd0ec17588e6a2c3b62a93eb513ed8783f/msgpack-1.1.2.tar.gz", hash = "sha256:3b60763c1373dd60f398488069bcdc703cd08a711477b5d480eecc9f9626f47e", size = 173581, upload-time = "2025-10-08T09:15:56.596Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/31/f9/c0a1c127f9049db9155afc316952ea571720dd01833ff5e4d7e8e6352dbb/msgpack-1.2.1.tar.gz", hash = "sha256:04c721c2c7448767e9e3f2520a475663d8ee0f09c31890f6d2bd70fd636a9647", size = 183960, upload-time = "2026-06-18T16:13:52.594Z" }
 wheels = [
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-    { url = "https://files.pythonhosted.org/packages/92/dc/c385f38f2c2433333345a82926c6bfa5ecfff3ef787201614317b58dd8be/msgpack-1.1.2-cp313-cp313-macosx_11_0_arm64.whl", hash = "sha256:42eefe2c3e2af97ed470eec850facbe1b5ad1d6eacdbadc42ec98e7dcf68b4b7", size = 84315, upload-time = "2025-10-08T09:15:15.543Z" },
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+    { url = "https://files.pythonhosted.org/packages/a6/9b/7a58e61d62be561da3a356fe2384d4059a6345fc130e23ef1c36a5b81d24/pillow-12.3.0-cp313-cp313-win_amd64.whl", hash = "sha256:1cca606cd25738df4ed873d5ad46bbdb3d83b5cbca291f6b4ff13a4df6b0bbe8", size = 7239691, upload-time = "2026-07-01T11:54:47.141Z" },
+    { url = "https://files.pythonhosted.org/packages/aa/b0/c4ed4f0ef8f8fa5ee8351537db6650bb8189f7e118842978dd6589065692/pillow-12.3.0-cp313-cp313-win_arm64.whl", hash = "sha256:b629de27fda84b42cde7edef0d85f13b958b47f6e9bbcbba9b673c562a89bd8b", size = 2568185, upload-time = "2026-07-01T11:54:49.137Z" },
 ]
 
 [[package]]
@@ -1565,7 +1558,7 @@ wheels = [
 
 [[package]]
 name = "transformers"
-version = "5.2.0"
+version = "5.5.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "huggingface-hub" },
@@ -1576,11 +1569,11 @@ dependencies = [
     { name = "safetensors" },
     { name = "tokenizers" },
     { name = "tqdm" },
-    { name = "typer-slim" },
+    { name = "typer" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/bd/7e/8a0c57d562015e5b16c97c1f0b8e0e92ead2c7c20513225dc12c2043ba9f/transformers-5.2.0.tar.gz", hash = "sha256:0088b8b46ccc9eff1a1dca72b5d618a5ee3b1befc3e418c9512b35dea9f9a650", size = 8618176, upload-time = "2026-02-16T18:54:02.867Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/ff/9d/fb46e729b461985f41a5740167688b924a4019141e5c164bea77548d3d9e/transformers-5.5.0.tar.gz", hash = "sha256:c8db656cf51c600cd8c75f06b20ef85c72e8b8ff9abc880c5d3e8bc70e0ddcbd", size = 8237745, upload-time = "2026-04-02T16:13:08.113Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/4e/93/79754b0ca486e556c2b95d4f5afc66aaf4b260694f3d6e1b51da2d036691/transformers-5.2.0-py3-none-any.whl", hash = "sha256:9ecaf243dc45bee11a7d93f8caf03746accc0cb069181bbf4ad8566c53e854b4", size = 10403304, upload-time = "2026-02-16T18:53:59.699Z" },
+    { url = "https://files.pythonhosted.org/packages/e7/28/35f7411ff80a3640c1f4fc907dcbb6a65061ebb82f66950e38bfc9f7f740/transformers-5.5.0-py3-none-any.whl", hash = "sha256:821a9ff0961abbb29eb1eb686d78df1c85929fdf213a3fe49dc6bd94f9efa944", size = 10245591, upload-time = "2026-04-02T16:13:03.462Z" },
 ]
 
 [[package]]
@@ -1609,18 +1602,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/4a/91/48db081e7a63bb37284f9fbcefda7c44c277b18b0e13fbc36ea2335b71e6/typer-0.24.1-py3-none-any.whl", hash = "sha256:112c1f0ce578bfb4cab9ffdabc68f031416ebcc216536611ba21f04e9aa84c9e", size = 56085, upload-time = "2026-02-21T16:54:41.616Z" },
 ]
 
-[[package]]
-name = "typer-slim"
-version = "0.24.0"
-source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "typer" },
-]
-sdist = { url = "https://files.pythonhosted.org/packages/a7/a7/e6aecc4b4eb59598829a3b5076a93aff291b4fdaa2ded25efc4e1f4d219c/typer_slim-0.24.0.tar.gz", hash = "sha256:f0ed36127183f52ae6ced2ecb2521789995992c521a46083bfcdbb652d22ad34", size = 4776, upload-time = "2026-02-16T22:08:51.2Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/a7/24/5480c20380dfd18cf33d14784096dca45a24eae6102e91d49a718d3b6855/typer_slim-0.24.0-py3-none-any.whl", hash = "sha256:d5d7ee1ee2834d5020c7c616ed5e0d0f29b9a4b1dd283bdebae198ec09778d0e", size = 3394, upload-time = "2026-02-16T22:08:49.92Z" },
-]
-
 [[package]]
 name = "typing-extensions"
 version = "4.15.0"
diff --git a/scripts/ci/build/lambda/pre_build.sh b/scripts/ci/build/lambda/pre_build.sh
index 89c474514071..218316609287 100755
--- a/scripts/ci/build/lambda/pre_build.sh
+++ b/scripts/ci/build/lambda/pre_build.sh
@@ -1,12 +1,18 @@
 #!/usr/bin/env bash
 # Pre-build hook for Lambda images.
-# Downloads the thread-mode RIC preview tarball from S3 for preview targets.
+# Downloads the multi-mode concurrency RIC tarball from S3 for targets that need it.
 #
 # Usage:
 #   bash scripts/ci/build/lambda/pre_build.sh --config-file <path>
 #
 # Side effects:
-#   Places awslambdaric tarball in docker/lambda/artifacts/ (preview targets only)
+#   Places the awslambdaric tarball in docker/lambda/artifacts/ (RIC targets only)
+#
+# Versioning: awslambdaric_version (e.g. 3.1.1) is the Python package version and
+# may repeat across RIC releases, so it alone cannot identify a build.
+# awslambdaric_release (e.g. 2.0.0.0) is the RIC release version and is the
+# provenance key: it selects the S3 path so each image traces to exactly one build
+# and rollback is a one-field change. It is required for RIC targets.
 
 set -euo pipefail
 
@@ -24,13 +30,15 @@ done
 
 TARGET=$(yq '.build.target' "$CONFIG_FILE")
 AWSLAMBDARIC_VERSION=$(yq '.build.awslambdaric_version // "3.1.1"' "$CONFIG_FILE")
+AWSLAMBDARIC_RELEASE=$(yq '.build.awslambdaric_release // ""' "$CONFIG_FILE")
 
 if [[ "$TARGET" == *preview* ]]; then
-  echo "Preview target detected — downloading RIC tarball..."
+  [[ -n "$AWSLAMBDARIC_RELEASE" ]] || { echo "ERROR: awslambdaric_release is required for RIC targets" >&2; exit 1; }
+  echo "RIC target detected — downloading RIC tarball (release ${AWSLAMBDARIC_RELEASE}, version ${AWSLAMBDARIC_VERSION})..."
   mkdir -p docker/lambda/artifacts
-  aws s3 cp "s3://dlc-cicd-wheels/lambda-ric/awslambdaric-${AWSLAMBDARIC_VERSION}.tar.gz" \
+  aws s3 cp "s3://dlc-cicd-wheels/lambda-ric/${AWSLAMBDARIC_RELEASE}/awslambdaric-${AWSLAMBDARIC_VERSION}.tar.gz" \
     "docker/lambda/artifacts/awslambdaric-${AWSLAMBDARIC_VERSION}.tar.gz" --region us-west-2
   echo "RIC tarball downloaded."
 else
-  echo "Non-preview target — skipping RIC tarball download."
+  echo "Non-RIC target — skipping RIC tarball download."
 fi
diff --git a/test/lambda/unit/test_lambda_runtime.py b/test/lambda/unit/test_lambda_runtime.py
index b67065a23b8b..b6f54093f8cf 100644
--- a/test/lambda/unit/test_lambda_runtime.py
+++ b/test/lambda/unit/test_lambda_runtime.py
@@ -3,11 +3,27 @@
 import importlib
 import os
 
+import pytest
+
 
 def test_awslambdaric_importable():
     importlib.import_module("awslambdaric")
 
 
+def test_concurrency_mode_valid_when_set():
+    """If the concurrency-mode knob is set, it must be a supported value."""
+    mode = os.environ.get("AWS_LAMBDA_CONCURRENCY_MODE")
+    if mode is not None:
+        assert mode in {"thread", "process", "hybrid"}, f"unexpected concurrency mode: {mode}"
+
+
+def test_multimode_ric_provides_concurrency_hooks():
+    """The multi-mode RIC ships the concurrency-hooks module (source of the
+    pre-fork hook decorator); the older single-mode client does not."""
+    if os.environ.get("AWS_LAMBDA_CONCURRENCY_MODE") is not None:
+        importlib.import_module("awslambdaric.lambda_concurrency_hooks")
+
+
 def test_rie_binary_exists():
     rie = "/usr/local/bin/aws-lambda-rie"
     assert os.path.isfile(rie), f"RIE not found at {rie}"
@@ -18,3 +34,57 @@ def test_entrypoint_exists():
     script = "/lambda_entrypoint.sh"
     assert os.path.isfile(script), "lambda_entrypoint.sh not found"
     assert os.access(script, os.X_OK), "lambda_entrypoint.sh not executable"
+
+
+def _multimode_config_provider():
+    """Return the multi-mode RIC's config provider, or skip if the running image
+    ships the older single-mode client (which has no concurrency-mode support)."""
+    lambda_config = pytest.importorskip("awslambdaric.lambda_config")
+    provider = getattr(lambda_config, "LambdaConfigProvider", None)
+    if provider is None or not hasattr(provider, "concurrency_mode"):
+        pytest.skip("multi-mode RIC not present in this image")
+    return provider
+
+
+@pytest.mark.parametrize("mode", ["process", "thread", "hybrid"])
+def test_concurrency_mode_runtime_override(monkeypatch, mode):
+    """A runtime env-var override — as set by `docker run -e ...` or by a Lambda
+    function's environment configuration — must win over the image's baked default
+    and be honored by the RIC's config resolution, for every supported mode."""
+    provider = _multimode_config_provider()
+    # RUNTIME_API is required for the provider to construct; value is unused here.
+    monkeypatch.setenv("AWS_LAMBDA_RUNTIME_API", "127.0.0.1:9001")
+    monkeypatch.setenv("AWS_LAMBDA_CONCURRENCY_MODE", mode)
+    # environ defaults to the live os.environ, so this reads the overridden value.
+    cfg = provider(["python", "handler.handler"])
+    assert cfg.concurrency_mode == mode
+
+
+def test_concurrency_mode_invalid_override_rejected(monkeypatch):
+    """An unsupported override value must be rejected loudly, not silently ignored."""
+    provider = _multimode_config_provider()
+    monkeypatch.setenv("AWS_LAMBDA_RUNTIME_API", "127.0.0.1:9001")
+    monkeypatch.setenv("AWS_LAMBDA_CONCURRENCY_MODE", "bogus")
+    with pytest.raises(ValueError):
+        provider(["python", "handler.handler"])
+
+
+def test_ric_resolves_container_env():
+    """End-to-end: assert the RIC resolves the concurrency mode actually injected
+    into the container. The expected value comes from a SEPARATE var
+    (EXPECTED_CONCURRENCY_MODE), not the var under test, so a failure of
+    AWS_LAMBDA_CONCURRENCY_MODE to propagate cannot silently pass. CI runs this
+    with the image's baked default (no override) and again under an `-e` override
+    for every supported mode."""
+    provider = _multimode_config_provider()
+    # RUNTIME_API is required for the provider to construct; value is unused here.
+    env = {**os.environ, "AWS_LAMBDA_RUNTIME_API": "127.0.0.1:9001"}
+    resolved = provider(["python", "handler.handler"], environ=env).concurrency_mode
+    expected = os.environ.get("EXPECTED_CONCURRENCY_MODE")
+    if expected is None:
+        # No injected expectation → the image's baked default must resolve.
+        assert resolved == "process"
+    else:
+        # Prove the override propagated into the container AND the RIC honored it.
+        assert os.environ.get("AWS_LAMBDA_CONCURRENCY_MODE") == expected
+        assert resolved == expected
diff --git a/test/security/data/ecr_scan_allowlist/lambda/framework_allowlist.json b/test/security/data/ecr_scan_allowlist/lambda/framework_allowlist.json
index f3cd70c81860..6377c2db8200 100644
--- a/test/security/data/ecr_scan_allowlist/lambda/framework_allowlist.json
+++ b/test/security/data/ecr_scan_allowlist/lambda/framework_allowlist.json
@@ -10,66 +10,76 @@
     {
         "vulnerability_id": "CVE-2025-23308",
         "reason": "NVIDIA CUDA toolkit CVE in cuda-toolkit-config-common. Fix requires CUDA 13.x base image which is not yet available. Not exploitable at Lambda runtime (requires user to run nvdisasm on malicious ELF).",
-        "review_by": "2026-07-15"
+        "review_by": "2026-10-01"
     },
     {
         "vulnerability_id": "CVE-2025-23339",
         "reason": "NVIDIA CUDA toolkit CVE in cuda-toolkit-config-common. Fix requires CUDA 13.x base image which is not yet available. Not exploitable at Lambda runtime (requires user to run cuobjdump on malicious ELF).",
-        "review_by": "2026-07-15"
+        "review_by": "2026-10-01"
     },
     {
         "vulnerability_id": "CVE-2026-25679",
         "reason": "Go stdlib CVE in aws-lambda-rie binary. Fixed in Go 1.26.x but no new RIE release yet. We download releases/latest so this will auto-resolve on next RIE release.",
-        "review_by": "2026-07-01"
+        "review_by": "2026-10-01"
     },
     {
         "vulnerability_id": "CVE-2026-27142",
         "reason": "Go stdlib CVE in aws-lambda-rie binary. Fixed in Go 1.26.x but no new RIE release yet. We download releases/latest so this will auto-resolve on next RIE release.",
-        "review_by": "2026-07-01"
+        "review_by": "2026-10-01"
     },
     {
         "vulnerability_id": "CVE-2026-32280",
         "reason": "Go stdlib CVE in aws-lambda-rie binary (built with Go 1.25.8). Fixed in Go 1.26.2. No new RIE release yet. Will auto-resolve on next RIE release.",
-        "review_by": "2026-07-01"
+        "review_by": "2026-10-01"
     },
     {
         "vulnerability_id": "CVE-2026-32281",
         "reason": "Go stdlib CVE in aws-lambda-rie binary (built with Go 1.25.8). Fixed in Go 1.26.2. No new RIE release yet. Will auto-resolve on next RIE release.",
-        "review_by": "2026-07-01"
+        "review_by": "2026-10-01"
     },
     {
         "vulnerability_id": "CVE-2026-32283",
         "reason": "Go stdlib CVE in aws-lambda-rie binary (built with Go 1.25.8). Fixed in Go 1.26.2. No new RIE release yet. Will auto-resolve on next RIE release.",
-        "review_by": "2026-07-01"
+        "review_by": "2026-10-01"
     },
     {
         "vulnerability_id": "CVE-2026-33811",
         "reason": "Go stdlib CVE in aws-lambda-rie binary (built with Go 1.25.8). Fixed in Go 1.26.3. No new RIE release yet. Will auto-resolve on next RIE release.",
-        "review_by": "2026-07-01"
+        "review_by": "2026-10-01"
     },
     {
         "vulnerability_id": "CVE-2026-33814",
         "reason": "Go stdlib CVE in aws-lambda-rie binary (built with Go 1.25.8). Fixed in Go 1.26.3. No new RIE release yet. Will auto-resolve on next RIE release.",
-        "review_by": "2026-07-01"
+        "review_by": "2026-10-01"
     },
     {
         "vulnerability_id": "CVE-2026-39820",
         "reason": "Go stdlib CVE in aws-lambda-rie binary (built with Go 1.25.8). Fixed in Go 1.26.3. No new RIE release yet. Will auto-resolve on next RIE release.",
-        "review_by": "2026-07-01"
+        "review_by": "2026-10-01"
     },
     {
         "vulnerability_id": "CVE-2026-39836",
         "reason": "Go stdlib CVE in aws-lambda-rie binary (built with Go 1.25.8). Fixed in Go 1.26.3. No new RIE release yet. Will auto-resolve on next RIE release.",
-        "review_by": "2026-07-01"
+        "review_by": "2026-10-01"
     },
     {
         "vulnerability_id": "CVE-2026-42499",
         "reason": "Go stdlib CVE in aws-lambda-rie binary (built with Go 1.25.8). Fixed in Go 1.26.3. No new RIE release yet. Will auto-resolve on next RIE release.",
-        "review_by": "2026-07-01"
+        "review_by": "2026-10-01"
     },
     {
         "vulnerability_id": "CVE-2026-42504",
         "reason": "Go stdlib CVE in aws-lambda-rie binary (built with Go 1.25.8). Fixed in Go 1.26.4. No new RIE release yet. Will auto-resolve on next RIE release.",
-        "review_by": "2026-07-01"
+        "review_by": "2026-10-01"
+    },
+    {
+        "vulnerability_id": "CVE-2026-27145",
+        "reason": "Go stdlib CVE in aws-lambda-rie binary (built with Go 1.25.8). Fixed in Go 1.26.4. No new RIE release yet. We download releases/latest so this will auto-resolve on next RIE release.",
+        "review_by": "2026-10-01"
+    },
+    {
+        "vulnerability_id": "CVE-2026-39822",
+        "reason": "Go stdlib CVE in aws-lambda-rie binary (built with Go 1.25.8). Fixed in Go 1.26.5. No new RIE release yet. We download releases/latest so this will auto-resolve on next RIE release.",
+        "review_by": "2026-10-01"
     }
 ]