diff --git a/.github/workflows/codeql-daily.yml b/.github/workflows/codeql-daily.yml
index 358695c84f61c..1badcf748209e 100644
--- a/.github/workflows/codeql-daily.yml
+++ b/.github/workflows/codeql-daily.yml
@@ -26,7 +26,7 @@ jobs:
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@a66b44a48a44d63acf71688c56aa168ac171d4cf # v1
+      uses: github/codeql-action/init@75f07e7ab2ee63cba88752d8c696324e4df67466
       # Override language selection by uncommenting this and choosing your languages
       with:
         languages: cpp
@@ -53,4 +53,4 @@ jobs:
         git clean -xdf
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@a66b44a48a44d63acf71688c56aa168ac171d4cf # v1
+      uses: github/codeql-action/analyze@75f07e7ab2ee63cba88752d8c696324e4df67466
diff --git a/.github/workflows/codeql-push.yml b/.github/workflows/codeql-push.yml
index d79e7a011d347..f3936374311bc 100644
--- a/.github/workflows/codeql-push.yml
+++ b/.github/workflows/codeql-push.yml
@@ -34,7 +34,7 @@ jobs:
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@a66b44a48a44d63acf71688c56aa168ac171d4cf # v1
+      uses: github/codeql-action/init@75f07e7ab2ee63cba88752d8c696324e4df67466
       # Override language selection by uncommenting this and choosing your languages
       with:
         languages: cpp
@@ -64,4 +64,4 @@ jobs:
 
     - name: Perform CodeQL Analysis
       if: env.BUILD_TARGETS != ''
-      uses: github/codeql-action/analyze@a66b44a48a44d63acf71688c56aa168ac171d4cf # v1
+      uses: github/codeql-action/analyze@75f07e7ab2ee63cba88752d8c696324e4df67466
diff --git a/examples/brotli/Dockerfile-service b/examples/brotli/Dockerfile-service
index 4712019f501b6..c9103f91a32a8 100644
--- a/examples/brotli/Dockerfile-service
+++ b/examples/brotli/Dockerfile-service
@@ -1,11 +1,11 @@
 FROM debian:buster-slim
 
 RUN apt-get update \
-    && apt-get install --no-install-recommends -y python3 python3-pip \
+    && apt-get install --no-install-recommends -y python3 python3-pip python3-setuptools \
     && apt-get autoremove -y && apt-get clean \
     && rm -rf /tmp/* /var/tmp/* \
     && rm -rf /var/lib/apt/lists/*
-RUN pip3 install -q flask
+RUN pip3 install -q Flask==2.0.3
 RUN mkdir -p /code/data
 RUN dd if=/dev/zero of="/code/data/file.txt" bs=1024 count=10240 \
     && dd if=/dev/zero of="/code/data/file.json" bs=1024 count=10240
diff --git a/examples/cache/Dockerfile-service b/examples/cache/Dockerfile-service
index a05db06f5e243..6c9a7f939fe8d 100644
--- a/examples/cache/Dockerfile-service
+++ b/examples/cache/Dockerfile-service
@@ -1,7 +1,7 @@
 FROM alpine:latest
 
 RUN apk update && apk add py3-pip
-RUN pip3 install -q Flask==0.11.1 pyyaml
+RUN pip3 install -q Flask==2.0.3 pyyaml
 RUN mkdir /code
 COPY ./service.py /code
 CMD ["python3", "/code/service.py"]
diff --git a/examples/cors/backend/Dockerfile-service b/examples/cors/backend/Dockerfile-service
index 4b98a80704dc7..e5fb609c85395 100644
--- a/examples/cors/backend/Dockerfile-service
+++ b/examples/cors/backend/Dockerfile-service
@@ -1,7 +1,7 @@
 FROM alpine:latest
 
 RUN apk update && apk add py3-pip
-RUN pip3 install -q Flask==0.11.1
+RUN pip3 install -q Flask==2.0.3
 RUN mkdir /code
 ADD ./service.py /code/
 
diff --git a/examples/cors/frontend/Dockerfile-service b/examples/cors/frontend/Dockerfile-service
index 85dba2382f99e..704184b2ac3ae 100644
--- a/examples/cors/frontend/Dockerfile-service
+++ b/examples/cors/frontend/Dockerfile-service
@@ -1,7 +1,7 @@
 FROM alpine:latest
 
 RUN apk update && apk add py3-pip
-RUN pip3 install -q Flask==0.11.1
+RUN pip3 install -q Flask==2.0.3
 RUN mkdir /code
 ADD ./service.py ./index.html /code/
 
diff --git a/examples/csrf/crosssite/Dockerfile-service b/examples/csrf/crosssite/Dockerfile-service
index 873f00e042460..60a57011cf803 100644
--- a/examples/csrf/crosssite/Dockerfile-service
+++ b/examples/csrf/crosssite/Dockerfile-service
@@ -1,7 +1,7 @@
 FROM alpine:latest
 
 RUN apk update && apk add py3-pip
-RUN pip3 install -q Flask==0.11.1
+RUN pip3 install -q Flask==2.0.3
 RUN mkdir /code
 ADD ./crosssite/service.py ./index.html /code/
 CMD ["python3", "/code/service.py"]
diff --git a/examples/csrf/samesite/Dockerfile-service b/examples/csrf/samesite/Dockerfile-service
index 17fd1f51a6dca..bc035fa1e5648 100644
--- a/examples/csrf/samesite/Dockerfile-service
+++ b/examples/csrf/samesite/Dockerfile-service
@@ -1,7 +1,7 @@
 FROM alpine:latest
 
 RUN apk update && apk add py3-pip
-RUN pip3 install -q Flask==0.11.1
+RUN pip3 install -q Flask==2.0.3
 RUN mkdir /code
 ADD ./samesite/service.py ./index.html /code/
 CMD ["python3", "/code/service.py"]
diff --git a/examples/double-proxy/Dockerfile-app b/examples/double-proxy/Dockerfile-app
index f843db1f8a53a..0e6f664dc63e5 100644
--- a/examples/double-proxy/Dockerfile-app
+++ b/examples/double-proxy/Dockerfile-app
@@ -1,7 +1,7 @@
 FROM python:3.8-alpine
 
 RUN apk update && apk add postgresql-dev gcc python3-dev musl-dev
-RUN pip3 install -q Flask==0.11.1 requests==2.18.4 psycopg2-binary
+RUN pip3 install -q Flask==2.0.3 requests==2.18.4 psycopg2-binary
 RUN mkdir /code
 ADD ./service.py /code
 ENTRYPOINT ["python3", "/code/service.py"]
diff --git a/examples/ext_authz/upstream/service/Dockerfile b/examples/ext_authz/upstream/service/Dockerfile
index 5f70f40aca7c6..9cd53e82641de 100644
--- a/examples/ext_authz/upstream/service/Dockerfile
+++ b/examples/ext_authz/upstream/service/Dockerfile
@@ -1,5 +1,5 @@
 FROM python:3-alpine
 
-RUN pip3 install -q Flask==0.11.1
+RUN pip3 install -q Flask==2.0.3
 COPY . ./app
 CMD ["python3", "/app/service/server.py"]
diff --git a/examples/front-proxy/Dockerfile-jaeger-service b/examples/front-proxy/Dockerfile-jaeger-service
index f8bbf13b03e03..4a38c6efff76f 100644
--- a/examples/front-proxy/Dockerfile-jaeger-service
+++ b/examples/front-proxy/Dockerfile-jaeger-service
@@ -1,7 +1,7 @@
-FROM envoyproxy/envoy-alpine-dev:latest
+FROM envoyproxy/envoy-dev:latest
 
-RUN apk update && apk add py3-pip bash curl
-RUN pip3 install -q Flask==0.11.1 requests==2.18.4
+RUN apt-get update && apt-get -q install --no-install-recommends -y python3-pip curl
+RUN pip3 install -q Flask==2.0.3 requests==2.18.4
 RUN mkdir /code
 ADD ./service.py /code
 ADD ./start_service.sh /usr/local/bin/start_service.sh
diff --git a/examples/front-proxy/Dockerfile-service b/examples/front-proxy/Dockerfile-service
index 0c2ae43024fa2..86fdf2b667b4a 100644
--- a/examples/front-proxy/Dockerfile-service
+++ b/examples/front-proxy/Dockerfile-service
@@ -1,7 +1,7 @@
-FROM envoyproxy/envoy-alpine-dev:latest
+FROM envoyproxy/envoy-dev:latest
 
-RUN apk update && apk add py3-pip bash curl
-RUN pip3 install -q Flask==0.11.1 requests==2.18.4
+RUN apt-get update && apt-get -q install --no-install-recommends -y python3-pip curl
+RUN pip3 install -q Flask==2.0.3 requests==2.18.4
 RUN mkdir /code
 ADD ./service.py /code
 ADD ./start_service.sh /usr/local/bin/start_service.sh
diff --git a/examples/gzip/Dockerfile-service b/examples/gzip/Dockerfile-service
index 4712019f501b6..c9103f91a32a8 100644
--- a/examples/gzip/Dockerfile-service
+++ b/examples/gzip/Dockerfile-service
@@ -1,11 +1,11 @@
 FROM debian:buster-slim
 
 RUN apt-get update \
-    && apt-get install --no-install-recommends -y python3 python3-pip \
+    && apt-get install --no-install-recommends -y python3 python3-pip python3-setuptools \
     && apt-get autoremove -y && apt-get clean \
     && rm -rf /tmp/* /var/tmp/* \
     && rm -rf /var/lib/apt/lists/*
-RUN pip3 install -q flask
+RUN pip3 install -q Flask==2.0.3
 RUN mkdir -p /code/data
 RUN dd if=/dev/zero of="/code/data/file.txt" bs=1024 count=10240 \
     && dd if=/dev/zero of="/code/data/file.json" bs=1024 count=10240
diff --git a/examples/load-reporting-service/Dockerfile-http-server b/examples/load-reporting-service/Dockerfile-http-server
index a63927fbd8046..a1dc60c1d81ff 100644
--- a/examples/load-reporting-service/Dockerfile-http-server
+++ b/examples/load-reporting-service/Dockerfile-http-server
@@ -1,7 +1,7 @@
 FROM alpine:latest
 
 RUN apk update && apk add py3-pip
-RUN pip3 install -q Flask==0.11.1
+RUN pip3 install -q Flask==2.0.3
 RUN mkdir /code
 COPY ./service.py ./code
 
diff --git a/examples/win32-front-proxy/Dockerfile-service b/examples/win32-front-proxy/Dockerfile-service
index a347d8c3189fc..925bf95e6c962 100644
--- a/examples/win32-front-proxy/Dockerfile-service
+++ b/examples/win32-front-proxy/Dockerfile-service
@@ -3,7 +3,7 @@ FROM envoyproxy/envoy-windows-dev:latest
 COPY ./setup_python.ps1 /
 
 RUN powershell.exe .\\setup_python.ps1
-RUN pip3 install -q Flask==0.11.1 requests==2.18.4
+RUN pip3 install -q Flask==2.0.3 requests==2.18.4
 
 RUN powershell mkdir code
 ADD ./service.py ./code