diff --git a/.travis.yml b/.travis.yml
index 6df4a9d78..98bba93db 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,6 @@ dist: trusty
 sudo: true
 rust:
   - stable
-  - beta
 
 addons:
   apt:
@@ -17,10 +16,10 @@ env:
     - RUST_BACKTRACE="1"
   matrix:
     - TEST_DIR=core
-    - TEST_DIR=p2p
     - TEST_DIR=chain
-    - TEST_DIR=grin
+    - TEST_DIR=p2p
     - TEST_DIR=api
     - TEST_DIR=pool
+    - RUST_TEST_THREADS=1 TEST_DIR=grin
 
 script: cd $TEST_DIR && cargo test --verbose