diff --git a/integrations/c.Dockerfile b/integrations/c.Dockerfile
index 6aaac1c52..83f900f9f 100644
--- a/integrations/c.Dockerfile
+++ b/integrations/c.Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.18
+FROM alpine:3.22
 
 COPY integrations/https-cert/rootCA.pem /root/integration-test.pem
 
@@ -19,4 +19,3 @@ ADD package.json /src/
 RUN npm install
 
 ADD . /src
-
diff --git a/integrations/csharp.Dockerfile b/integrations/csharp.Dockerfile
index c81b9ced0..249350187 100644
--- a/integrations/csharp.Dockerfile
+++ b/integrations/csharp.Dockerfile
@@ -1,5 +1,5 @@
-FROM node:20-alpine3.18 AS node
-FROM mcr.microsoft.com/dotnet/sdk:7.0-alpine3.18
+FROM node:22-alpine AS node
+FROM mcr.microsoft.com/dotnet/sdk:8.0-alpine3.22
 
 COPY integrations/https-cert/rootCA.pem /root/integration-test.pem
 
@@ -14,8 +14,9 @@ RUN apk --no-cache add ca-certificates && \
 # https://github.com/pyodide/pyodide/blob/1691d347d15a2c211cd49aebe6f15d42dfdf2369/Dockerfile#L105
 COPY --from=node /usr/local/bin/node /usr/local/bin/
 COPY --from=node /usr/local/lib/node_modules /usr/local/lib/node_modules
-RUN ln -s ../lib/node_modules/npm/bin/npm-cli.js /usr/local/bin/npm \
-    && ln -s ../lib/node_modules/npm/bin/npx-cli.js /usr/local/bin/npx
+RUN apk add --no-cache libstdc++ && \
+  ln -s ../lib/node_modules/npm/bin/npm-cli.js /usr/local/bin/npm && \
+  ln -s ../lib/node_modules/npm/bin/npx-cli.js /usr/local/bin/npx
 
 WORKDIR /src
 
@@ -23,7 +24,7 @@ WORKDIR /src
 #   folder with our test fixtures to run them
 # - install RestSharp into that project
 # - make a folder with the appropriate structure to hold the test fixtures
-RUN dotnet new console -o IntTestCsharp -f net7.0 && \
+RUN dotnet new console -o IntTestCsharp -f net8.0 && \
   cd IntTestCsharp && \
   dotnet add package RestSharp && \
   mkdir -p /src/IntTestCsharp/src/fixtures/files
diff --git a/integrations/go.Dockerfile b/integrations/go.Dockerfile
index 721852b9f..fc26e6f1c 100644
--- a/integrations/go.Dockerfile
+++ b/integrations/go.Dockerfile
@@ -1,4 +1,5 @@
-FROM golang:1.20.5-alpine3.18
+FROM node:22-alpine AS node
+FROM golang:1.24-alpine3.22
 
 COPY integrations/https-cert/rootCA.pem /root/integration-test.pem
 
@@ -8,13 +9,20 @@ RUN apk --no-cache add ca-certificates && \
   cp /root/integration-test.pem /usr/local/share/ca-certificates/ && \
   update-ca-certificates
 
-# XXX: do we eventually need to care about getting an exact version of node
-# here? If so, see the csharp container for how to do that
-RUN apk update && \
-  apk add nodejs npm
+COPY --from=node /usr/local/bin/node /usr/local/bin/
+COPY --from=node /usr/local/lib/node_modules /usr/local/lib/node_modules
+RUN apk add --no-cache libstdc++ && \
+  ln -s ../lib/node_modules/npm/bin/npm-cli.js /usr/local/bin/npm && \
+  ln -s ../lib/node_modules/npm/bin/npx-cli.js /usr/local/bin/npx
 
 WORKDIR /src
 
+# Pre-warm the Go build cache so the first integration test doesn't cold-compile
+# the entire stdlib (net/http, io, strings, time, etc.) and hit vitest's 5s timeout.
+RUN printf 'package main\nimport ("fmt";"io";"net/http";"strings";"time")\nfunc main(){_=fmt.Sprint;_=io.Discard;_=http.DefaultClient;_=strings.NewReader;_=time.Second}\n' > /tmp/warmup.go && \
+  go run /tmp/warmup.go && \
+  rm /tmp/warmup.go
+
 # add pacakge.json first so we don't have to `npm install` unless it changes
 ADD package.json /src/
 RUN npm install
diff --git a/integrations/node.Dockerfile b/integrations/node.Dockerfile
index f599f3082..db599478b 100755
--- a/integrations/node.Dockerfile
+++ b/integrations/node.Dockerfile
@@ -1,4 +1,4 @@
-FROM node:18-alpine
+FROM node:22-alpine
 
 COPY integrations/https-cert/rootCA.pem /root/integration-test.pem
 
diff --git a/integrations/php.Dockerfile b/integrations/php.Dockerfile
index 1a90f0605..e876152de 100644
--- a/integrations/php.Dockerfile
+++ b/integrations/php.Dockerfile
@@ -4,7 +4,7 @@ WORKDIR /composer/
 # https://packagist.org/packages/guzzlehttp/guzzle
 RUN composer require guzzlehttp/guzzle
 
-FROM alpine:3.18
+FROM alpine:3.22
 
 COPY integrations/https-cert/rootCA.pem /root/integration-test.pem
 COPY --from=builder /composer/vendor /src/vendor
@@ -16,7 +16,8 @@ RUN apk --no-cache add ca-certificates && \
   update-ca-certificates
 
 RUN apk update && \
-  apk add nodejs npm php81 php81-fpm php81-opcache php81-curl
+  apk add nodejs npm php83 php83-fpm php83-opcache php83-curl && \
+  ln -sf /usr/bin/php83 /usr/bin/php
 
 WORKDIR /src
 
diff --git a/integrations/python.Dockerfile b/integrations/python.Dockerfile
index 864965702..33e12a779 100644
--- a/integrations/python.Dockerfile
+++ b/integrations/python.Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.18
+FROM alpine:3.22
 
 COPY integrations/https-cert/rootCA.pem /root/integration-test.pem
 
@@ -9,8 +9,7 @@ RUN apk --no-cache add ca-certificates && \
   update-ca-certificates
 
 RUN apk update && \
-  apk add nodejs npm python3 py3-pip && \
-  pip install requests
+  apk add nodejs npm python3 py3-requests
 
 WORKDIR /src
 
@@ -20,4 +19,3 @@ ADD package.json /src/
 RUN npm install
 
 ADD . /src
-
diff --git a/integrations/shell.Dockerfile b/integrations/shell.Dockerfile
index 0d6297b96..91e34e59b 100644
--- a/integrations/shell.Dockerfile
+++ b/integrations/shell.Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.18
+FROM alpine:3.22
 
 COPY integrations/https-cert/rootCA.pem /root/integration-test.pem
 
diff --git a/src/fixtures/requests/cookies.cjs b/src/fixtures/requests/cookies.cjs
index 231a46784..be5858bb7 100644
--- a/src/fixtures/requests/cookies.cjs
+++ b/src/fixtures/requests/cookies.cjs
@@ -35,8 +35,10 @@ module.exports = {
             size: -1,
             mimeType: 'application/json',
             text: JSON.stringify({
-              bar: 'baz',
-              foo: 'bar',
+              cookies: {
+                bar: 'baz',
+                foo: 'bar',
+              },
             }),
           },
           headersSize: -1,