diff --git a/.travis.yml b/.travis.yml
index ba96dd4e..d315e0a7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,18 @@ language: rust
 
 matrix:
   include:
+    - env: TARGET=x86_64-unknown-linux-gnu
+      rust: beta
+      if: branch != master
+
+    - env: TARGET=thumbv6m-none-eabi
+      rust: beta
+      if: branch != master
+
+    - env: TARGET=thumbv7m-none-eabi
+      rust: beta
+      if: branch != master
+
     - env: TARGET=x86_64-unknown-linux-gnu
       rust: nightly
 
diff --git a/ci/script.sh b/ci/script.sh
index eafda3fd..335da344 100644
--- a/ci/script.sh
+++ b/ci/script.sh
@@ -1,22 +1,28 @@
 set -euxo pipefail
 
 main() {
-    cargo check --target $TARGET
+    cargo check --target $TARGET --no-default-features
+    if [ $TRAVIS_RUST_VERSION = nightly ]; then
+        cargo check --target $TARGET
+    fi
 
     if [ $TARGET = x86_64-unknown-linux-gnu ]; then
-        cargo test --target $TARGET
         cargo test --target $TARGET --no-default-features
-        cargo test --target $TARGET --release
         cargo test --target $TARGET --release --no-default-features
 
-        export RUSTFLAGS="-Z sanitizer=thread"
-        export RUST_TEST_THREADS=1
-        export TSAN_OPTIONS="suppressions=$(pwd)/blacklist.txt"
+        if [ $TRAVIS_RUST_VERSION = nightly ]; then
+            cargo test --target $TARGET
+            cargo test --target $TARGET --release
 
-        cargo test --test tsan --target $TARGET
-        cargo test --test tsan --target $TARGET --no-default-features
-        cargo test --test tsan --target $TARGET --release
-        cargo test --test tsan --target $TARGET --release --no-default-features
+            export RUSTFLAGS="-Z sanitizer=thread"
+            export RUST_TEST_THREADS=1
+            export TSAN_OPTIONS="suppressions=$(pwd)/blacklist.txt"
+
+            cargo test --test tsan --target $TARGET
+            cargo test --test tsan --target $TARGET --no-default-features
+            cargo test --test tsan --target $TARGET --release
+            cargo test --test tsan --target $TARGET --release --no-default-features
+        fi
     fi
 }