diff --git a/Dockerfile b/Dockerfile
index 0f33fd5..282c7cf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,7 +17,4 @@ COPY . /var/www
 
 RUN npm install && mkdir tmp
 
-# Temporary fix to cryptography warning
-RUN pip install cryptography==2.9.2
-
 ENTRYPOINT ["/usr/bin/nodejs", "/var/www/index.js"]
diff --git a/helpers/odmOptionsToJson.py b/helpers/odmOptionsToJson.py
index a9bf060..ce292c9 100644
--- a/helpers/odmOptionsToJson.py
+++ b/helpers/odmOptionsToJson.py
@@ -21,6 +21,9 @@ import sys
 import imp
 import argparse
 import json
+import os
+
+dest_file = os.environ.get("ODM_OPTIONS_TMP_FILE")
 
 sys.path.append(sys.argv[2])
 
@@ -43,4 +46,9 @@ class ArgumentParserStub(argparse.ArgumentParser):
 
 odm.parser = ArgumentParserStub()
 odm.config()
-print json.dumps(options)
+out = json.dumps(options)
+print(out)
+if dest_file is not None:
+    with open(dest_file, "w") as f:
+        f.write(out)
+
diff --git a/libs/odmRunner.js b/libs/odmRunner.js
index 6b315d5..1ec5462 100644
--- a/libs/odmRunner.js
+++ b/libs/odmRunner.js
@@ -22,7 +22,7 @@ let assert = require('assert');
 let spawn = require('child_process').spawn;
 let config = require('../config.js');
 let logger = require('./logger');
-
+let utils = require('./utils');
 
 module.exports = {
     run: function(options, projectName, done, outputReceived){
@@ -113,24 +113,37 @@ module.exports = {
         }
 
         // Launch
+        const env = utils.clone(process.env);
+        env.ODM_OPTIONS_TMP_FILE = utils.tmpPath(".json");
         let childProcess = spawn("python", [path.join(__dirname, "..", "helpers", "odmOptionsToJson.py"),
-                "--project-path", config.odm_path, "bogusname"]);
-        let output = [];
+                "--project-path", config.odm_path, "bogusname"], { env });
+
+        // Cleanup on done
+        let handleResult = (err, result) => {
+            fs.exists(env.ODM_OPTIONS_TMP_FILE, exists => {
+                if (exists) fs.unlink(env.ODM_OPTIONS_TMP_FILE, err => {
+                    if (err) console.warning(`Cannot cleanup ${env.ODM_OPTIONS_TMP_FILE}`);
+                });
+            });
+
+            // Don't wait
+            done(err, result);
+        };
 
         childProcess
             .on('exit', (code, signal) => {
                 try{
-                    let json = JSON.parse(output.join(""));
-                    done(null, json);
+                    fs.readFile(env.ODM_OPTIONS_TMP_FILE, { encoding: "utf8" }, (err, data) => {
+                        if (err) handleResult(new Error(`Cannot read list of options from ODM (from temporary file). Is ODM installed in ${config.odm_path}?`));
+                        else{
+                            let json = JSON.parse(data);
+                            handleResult(null, json);
+                        }
+                    });
                 }catch(err){
-                    done(new Error(`Could not load list of options from OpenDroneMap. Is OpenDroneMap installed in ${config.odm_path}? Make sure that OpenDroneMap is installed and that --odm_path is set properly: ${err.message}`));
+                    handleResult(new Error(`Could not load list of options from ODM. Is ODM installed in ${config.odm_path}? Make sure that OpenDroneMap is installed and that --odm_path is set properly: ${err.message}`));
                 }
             })
-            .on('error', done);
-
-        let processOutput = chunk => output.push(chunk.toString());
-
-        childProcess.stdout.on('data', processOutput);
-        childProcess.stderr.on('data', processOutput);
+            .on('error', handleResult);
     }
 };
diff --git a/libs/utils.js b/libs/utils.js
index e749c63..afa9bcc 100644
--- a/libs/utils.js
+++ b/libs/utils.js
@@ -1,6 +1,8 @@
 "use strict";
 
 const path = require('path');
+const os = require('os');
+const crypto = require('crypto');
 
 module.exports = {
     get: function(scope, prop, defaultValue){
@@ -48,5 +50,9 @@ module.exports = {
 
     clone: function(json){
         return JSON.parse(JSON.stringify(json));
+    },
+
+    tmpPath: function(extension = ".txt"){
+        return path.join(os.tmpdir(), `nodeodm_${crypto.randomBytes(6).readUIntLE(0,6).toString(36)}${extension}`);
     }
 };
\ No newline at end of file