diff --git a/api/src/job.js b/api/src/job.js
index d46120b..8c3fa79 100644
--- a/api/src/job.js
+++ b/api/src/job.js
@@ -156,7 +156,11 @@ class Job {
                 '-s',
                 '-c',
                 '/box/submission',
-                '-e',
+                '-E',
+                'HOME=/tmp',
+                ...this.runtime.env_vars.flat_map(v => ['-E', v]),
+                '-E',
+                `PISTON_LANGUAGE=${this.runtime.language}`,
                 `--dir=${this.runtime.pkgdir}`,
                 `--dir=/etc:noexec`,
                 `--processes=${this.runtime.max_process_count}`,
@@ -175,10 +179,6 @@ class Job {
                 ...args,
             ],
             {
-                env: {
-                    ...this.runtime.env_vars,
-                    PISTON_LANGUAGE: this.runtime.language,
-                },
                 stdio: 'pipe',
             }
         );
diff --git a/api/src/runtime.js b/api/src/runtime.js
index 9a2adf4..90a2225 100644
--- a/api/src/runtime.js
+++ b/api/src/runtime.js
@@ -178,15 +178,7 @@ class Runtime {
             const env_file = path.join(this.pkgdir, '.env');
             const env_content = fss.read_file_sync(env_file).toString();
 
-            this._env_vars = {};
-
-            env_content
-                .trim()
-                .split('\n')
-                .map(line => line.split('=', 2))
-                .forEach(([key, val]) => {
-                    this._env_vars[key.trim()] = val.trim();
-                });
+            this._env_vars = env_content.trim().split('\n');
         }
 
         return this._env_vars;
diff --git a/cli/package-lock.json b/cli/package-lock.json
index 3a73bbf..5d2ab8c 100644
--- a/cli/package-lock.json
+++ b/cli/package-lock.json
@@ -13,7 +13,7 @@
                 "chalk": "^4.1.0",
                 "minimatch": "^3.0.4",
                 "nocamel": "^1.0.2",
-                "semver": "^7.3.5",
+                "semver": "^7.5.2",
                 "ws": "^7.5.3",
                 "yargs": "^16.2.0"
             }
@@ -194,9 +194,9 @@
             }
         },
         "node_modules/semver": {
-            "version": "7.3.5",
-            "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.5.tgz",
-            "integrity": "sha512-PoeGJYh8HK4BTO/a9Tf6ZG3veo/A7ZVsYrSA6J8ny9nb3B1VrpkuN+z9OE5wfE5p6H4LchYZsegiQgbJD94ZFQ==",
+            "version": "7.5.2",
+            "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.2.tgz",
+            "integrity": "sha512-SoftuTROv/cRjCze/scjGyiDtcUyxw1rgYQSZY7XTmtR5hX+dm76iDbTH8TkLPHCQmlbQVSSbNZCPM2hb0knnQ==",
             "dependencies": {
                 "lru-cache": "^6.0.0"
             },
@@ -444,9 +444,9 @@
             "integrity": "sha1-jGStX9MNqxyXbiNE/+f3kqam30I="
         },
         "semver": {
-            "version": "7.3.5",
-            "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.5.tgz",
-            "integrity": "sha512-PoeGJYh8HK4BTO/a9Tf6ZG3veo/A7ZVsYrSA6J8ny9nb3B1VrpkuN+z9OE5wfE5p6H4LchYZsegiQgbJD94ZFQ==",
+            "version": "7.5.2",
+            "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.2.tgz",
+            "integrity": "sha512-SoftuTROv/cRjCze/scjGyiDtcUyxw1rgYQSZY7XTmtR5hX+dm76iDbTH8TkLPHCQmlbQVSSbNZCPM2hb0knnQ==",
             "requires": {
                 "lru-cache": "^6.0.0"
             }
diff --git a/cli/package.json b/cli/package.json
index ef1103e..3cd8533 100644
--- a/cli/package.json
+++ b/cli/package.json
@@ -9,7 +9,7 @@
         "chalk": "^4.1.0",
         "minimatch": "^3.0.4",
         "nocamel": "^1.0.2",
-        "semver": "^7.3.5",
+        "semver": "^7.5.2",
         "ws": "^7.5.3",
         "yargs": "^16.2.0"
     }