diff --git a/packages/safe-chain/src/packagemanager/pip/runPipCommand.spec.js b/packages/safe-chain/src/packagemanager/pip/runPipCommand.spec.js
index b3d7b2e..ecd8e0f 100644
--- a/packages/safe-chain/src/packagemanager/pip/runPipCommand.spec.js
+++ b/packages/safe-chain/src/packagemanager/pip/runPipCommand.spec.js
@@ -29,7 +29,10 @@ describe("runPipCommand environment variable handling", () => {
         mergeSafeChainProxyEnvironmentVariables: (env) => ({
           ...env,
           ...customEnv,
+          // Force deterministic proxy for tests regardless of ambient env
+          GLOBAL_AGENT_HTTP_PROXY: "http://localhost:8080",
           HTTPS_PROXY: "http://localhost:8080",
+          HTTP_PROXY: "",
         }),
       },
     });
diff --git a/test/e2e/DockerTestContainer.js b/test/e2e/DockerTestContainer.js
index 289b451..ec1af3c 100644
--- a/test/e2e/DockerTestContainer.js
+++ b/test/e2e/DockerTestContainer.js
@@ -33,7 +33,7 @@ export class DockerTestContainer {
       ].join(" ");
 
       execSync(
-        `docker build --no-cache -t ${imageName} -f ${dockerFile} ${contextPath} ${buildArgs}`,
+        `docker build -t ${imageName} -f ${dockerFile} ${contextPath} ${buildArgs}`,
         {
           stdio: "ignore",
         }