diff --git a/.circleci/config.yml b/.circleci/config.yml
index 75c7b4bc5..5fa264a24 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -36,12 +36,13 @@ jobs:
           command: |
             git config --global --unset url."ssh://git@github.com".insteadOf || true
             rustup toolchain install nightly-2019-05-20
-            rustup component add rustfmt --toolchain=nightly-2019-05-20
-            rustup component add clippy --toolchain=nightly-2019-05-20 || cargo +nightly-2019-05-20 install --git https://github.com/rust-lang/rust-clippy/ --force clippy
+            rustup default nightly-2019-05-20
+            rustup component add rustfmt
+            rustup component add clippy || cargo install --git https://github.com/rust-lang/rust-clippy/ --force clippy
       - run:
           name: Execute lints
           command: |
-            cargo +nightly-2019-05-20 fmt --all -- --check
+            cargo fmt --all -- --check
       - save_cache:
           paths:
             - /usr/local/cargo/registry
@@ -50,7 +51,7 @@ jobs:
             - target/debug/deps
           key: v8-lint-{{ arch }}-{{ checksum "Cargo.lock" }}
 
-  test:
+  test-stable:
     docker:
       - image: circleci/rust:latest
     <<: *run_with_build_env_vars
@@ -60,16 +61,15 @@ jobs:
           keys:
             - v8-test-cargo-cache-linux-stable-{{ arch }}-{{ checksum "Cargo.lock" }}
       - <<: *run_install_dependencies
-      - run: rustup default nightly-2019-05-20
       - run:
           name: Tests
           command: make test
-      - run:
-          name: Integration Tests
-          command: make integration-tests
       - run:
           name: Release
           command: make fast-release
+      - run:
+          name: Integration Tests
+          command: make integration-tests
       - save_cache:
           paths:
             - /usr/local/cargo/registry
@@ -78,6 +78,38 @@ jobs:
             - target/debug/deps
           key: v8-test-cargo-cache-linux-stable-{{ arch }}-{{ checksum "Cargo.lock" }}
 
+  test:
+    docker:
+      - image: circleci/rust:latest
+    <<: *run_with_build_env_vars
+    steps:
+      - checkout
+      - restore_cache:
+          keys:
+            - v8-test-cargo-cache-linux-nightly-{{ arch }}-{{ checksum "Cargo.lock" }}
+      - <<: *run_install_dependencies
+      - run: rustup default nightly-2019-05-20
+      - run:
+          name: Tests
+          command: make test
+      - run:
+          name: Debug flag checked
+          command: |
+            cargo check --features "debug" --release
+      - run:
+          name: Release
+          command: make fast-release
+      - run:
+          name: Integration Tests
+          command: make integration-tests
+      - save_cache:
+          paths:
+            - /usr/local/cargo/registry
+            - target/debug/.fingerprint
+            - target/debug/build
+            - target/debug/deps
+          key: v8-test-cargo-cache-linux-nightly-{{ arch }}-{{ checksum "Cargo.lock" }}
+
   test-macos:
     macos:
       xcode: "9.0"
@@ -85,7 +117,7 @@ jobs:
       - checkout
       - restore_cache:
           keys:
-            - v8-cargo-cache-darwin-stable-{{ arch }}-{{ checksum "Cargo.lock" }}
+            - v8-cargo-cache-darwin-nightly-{{ arch }}-{{ checksum "Cargo.lock" }}
       - run:
           name: Install crate dependencies
           command: |
@@ -101,7 +133,7 @@ jobs:
           command: |
             curl -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain nightly-2019-05-20
             export PATH="$HOME/.cargo/bin:$PATH"
-            cargo +nightly --version
+            cargo --version
       - run:
           name: Tests
           command: |
@@ -112,6 +144,11 @@ jobs:
             ulimit -n 8000
             sudo sysctl -w kern.maxfiles=655360 kern.maxfilesperproc=327680
             make test
+      - run:
+          name: Release
+          command: |
+            export PATH="$HOME/.cargo/bin:$PATH"
+            make fast-release
       - run:
           name: Integration Tests
           command: |
@@ -119,18 +156,13 @@ jobs:
             export PATH="`pwd`/cmake-3.4.1-Darwin-x86_64/CMake.app/Contents/bin:$PATH"
             export LLVM_SYS_70_PREFIX="`pwd`/clang+llvm-7.0.0-x86_64-apple-darwin/"
             make integration-tests
-      - run:
-          name: Release
-          command: |
-            export PATH="$HOME/.cargo/bin:$PATH"
-            make fast-release
       - save_cache:
           paths:
             - ~/.cargo/registry/
             - target/release/.fingerprint
             - target/release/build
             - target/release/deps
-          key: v8-cargo-cache-darwin-stable-{{ arch }}-{{ checksum "Cargo.lock" }}
+          key: v8-cargo-cache-darwin-nightly-{{ arch }}-{{ checksum "Cargo.lock" }}
 
   test-and-build:
     docker:
@@ -152,10 +184,6 @@ jobs:
             curl -O https://releases.llvm.org/7.0.0/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz
             tar xf clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz
       - run: rustup default nightly-2019-05-20
-      - run:
-          name: Debug flag checked
-          command: |
-            cargo +nightly check --features "debug" --release
       - run:
           name: Tests
           command: |
@@ -166,7 +194,7 @@ jobs:
           command: |
             export LLVM_SYS_70_PREFIX="`pwd`/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04/"
             make release
-            cargo +nightly build --release --manifest-path wapm-cli/Cargo.toml --features telemetry
+            cargo build --release --manifest-path wapm-cli/Cargo.toml --features telemetry
             mkdir -p artifacts
             VERSION=$(cargo pkgid | cut -d# -f2 | cut -d: -f2)
             # GIT_VERSION=$(git describe --exact-match --tags)
@@ -177,7 +205,7 @@ jobs:
       - run:
           name: Dynamic library
           command: |
-            cargo +nightly build --release --manifest-path lib/runtime-c-api/Cargo.toml
+            cargo build --release --manifest-path lib/runtime-c-api/Cargo.toml
             cp target/release/libwasmer_runtime_c_api.so ./artifacts
       - persist_to_workspace:
           root: .
@@ -222,7 +250,7 @@ jobs:
           command: |
             curl -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain nightly-2019-05-20
             export PATH="$HOME/.cargo/bin:$PATH"
-            cargo +nightly --version
+            cargo --version
       - run:
           name: Tests
           command: |
@@ -241,7 +269,7 @@ jobs:
             export PATH="$HOME/.cargo/bin:$PATH"
             export LLVM_SYS_70_PREFIX="`pwd`/clang+llvm-7.0.0-x86_64-apple-darwin/"
             make release
-            cargo +nightly build --release --manifest-path wapm-cli/Cargo.toml --features telemetry
+            cargo build --release --manifest-path wapm-cli/Cargo.toml --features telemetry
             mkdir -p artifacts
             make build-install
             cp ./wasmer.tar.gz ./artifacts/$(./binary-name.sh)
@@ -251,7 +279,7 @@ jobs:
           name: Generate dynamic library for the runtime C API
           command: |
             export PATH="$HOME/.cargo/bin:$PATH"
-            cargo +nightly build --release --manifest-path lib/runtime-c-api/Cargo.toml
+            cargo build --release --manifest-path lib/runtime-c-api/Cargo.toml
             install_name_tool -id "@rpath/libwasmer_runtime_c_api.dylib" target/release/libwasmer_runtime_c_api.dylib
             cp target/release/libwasmer_runtime_c_api.dylib ./artifacts
       - persist_to_workspace:
@@ -344,6 +372,12 @@ workflows:
               only:
                 - trying
                 - staging
+      - test-stable:
+          filters:
+            branches:
+              only:
+                - trying
+                - staging
       - publish-github-release:
           requires:
             - lint
diff --git a/Makefile b/Makefile
index ba46a8a01..c3bd216f0 100644
--- a/Makefile
+++ b/Makefile
@@ -2,83 +2,83 @@
 
 # Generate files
 generate-spectests:
-	WASMER_RUNTIME_GENERATE_SPECTESTS=1 cargo +nightly build -p wasmer-runtime-core --release
+	WASMER_RUNTIME_GENERATE_SPECTESTS=1 cargo build -p wasmer-runtime-core --release
 
 generate-emtests:
-	WASM_EMSCRIPTEN_GENERATE_EMTESTS=1 cargo +nightly build -p wasmer-emscripten --release
+	WASM_EMSCRIPTEN_GENERATE_EMTESTS=1 cargo build -p wasmer-emscripten --release
 
 generate-wasitests:
-	WASM_WASI_GENERATE_WASITESTS=1 cargo +nightly build -p wasmer-wasi --release
+	WASM_WASI_GENERATE_WASITESTS=1 cargo build -p wasmer-wasi --release
 
 generate: generate-spectests generate-emtests generate-wasitests
 
 
 # Spectests
 spectests-singlepass:
-	cargo +nightly test --manifest-path lib/spectests/Cargo.toml --release --features singlepass
+	cargo test --manifest-path lib/spectests/Cargo.toml --release --features singlepass
 
 spectests-cranelift:
-	cargo +nightly test --manifest-path lib/spectests/Cargo.toml --release --features clif
+	cargo test --manifest-path lib/spectests/Cargo.toml --release --features clif
 
 spectests-llvm:
-	cargo +nightly test --manifest-path lib/spectests/Cargo.toml --release --features llvm
+	cargo test --manifest-path lib/spectests/Cargo.toml --release --features llvm
 
 spectests: spectests-singlepass spectests-cranelift spectests-llvm
 
 
 # Emscripten tests
 emtests-singlepass:
-	cargo +nightly test --manifest-path lib/emscripten/Cargo.toml --release --features singlepass -- --test-threads=1
+	cargo test --manifest-path lib/emscripten/Cargo.toml --release --features singlepass -- --test-threads=1
 
 emtests-cranelift:
-	cargo +nightly test --manifest-path lib/emscripten/Cargo.toml --release --features clif -- --test-threads=1
+	cargo test --manifest-path lib/emscripten/Cargo.toml --release --features clif -- --test-threads=1
 
 emtests-llvm:
-	cargo +nightly test --manifest-path lib/emscripten/Cargo.toml --release --features llvm -- --test-threads=1
+	cargo test --manifest-path lib/emscripten/Cargo.toml --release --features llvm -- --test-threads=1
 
 emtests: emtests-singlepass emtests-cranelift emtests-llvm
 
 
 # Middleware tests
 middleware-singlepass:
-	cargo +nightly test --manifest-path lib/middleware-common/Cargo.toml --release --features singlepass
+	cargo test --manifest-path lib/middleware-common/Cargo.toml --release --features singlepass
 
 middleware-cranelift:
-	cargo +nightly test --manifest-path lib/middleware-common/Cargo.toml --release --features clif
+	cargo test --manifest-path lib/middleware-common/Cargo.toml --release --features clif
 
 middleware-llvm:
-	cargo +nightly test --manifest-path lib/middleware-common/Cargo.toml --release --features llvm
+	cargo test --manifest-path lib/middleware-common/Cargo.toml --release --features llvm
 
 middleware: middleware-singlepass middleware-cranelift middleware-llvm
 
 
 # Wasitests
 wasitests-singlepass:
-	cargo +nightly test --manifest-path lib/wasi/Cargo.toml --release --features singlepass -- --test-threads=1
+	cargo test --manifest-path lib/wasi/Cargo.toml --release --features singlepass -- --test-threads=1
 
 wasitests-cranelift:
-	cargo +nightly test --manifest-path lib/wasi/Cargo.toml --release --features clif -- --test-threads=1
+	cargo test --manifest-path lib/wasi/Cargo.toml --release --features clif -- --test-threads=1
 
 wasitests-llvm:
-	cargo +nightly test --manifest-path lib/wasi/Cargo.toml --release --features llvm -- --test-threads=1
+	cargo test --manifest-path lib/wasi/Cargo.toml --release --features llvm -- --test-threads=1
 
 wasitests: wasitests-singlepass wasitests-cranelift wasitests-llvm
 
 
 # Backends
 singlepass: spectests-singlepass emtests-singlepass middleware-singlepass wasitests-singlepass
-	cargo +nightly test -p wasmer-singlepass-backend --release
+	cargo test -p wasmer-singlepass-backend --release
 
 cranelift: spectests-cranelift emtests-cranelift middleware-cranelift wasitests-cranelift
-	cargo +nightly test -p wasmer-clif-backend --release
+	cargo test -p wasmer-clif-backend --release
 
 llvm: spectests-llvm emtests-llvm middleware-llvm wasitests-llvm
-	cargo +nightly test -p wasmer-llvm-backend --release
+	cargo test -p wasmer-llvm-backend --release
 
 
 # All tests
 test-rest:
-	cargo +nightly test --release --all --exclude wasmer-emscripten --exclude wasmer-spectests --exclude wasmer-wasi --exclude wasmer-middleware-common --exclude wasmer-singlepass-backend --exclude wasmer-clif-backend --exclude wasmer-llvm-backend
+	cargo test --release --all --exclude wasmer-emscripten --exclude wasmer-spectests --exclude wasmer-wasi --exclude wasmer-middleware-common --exclude wasmer-singlepass-backend --exclude wasmer-clif-backend --exclude wasmer-llvm-backend
 
 circleci-clean:
 	@if [ ! -z "${CIRCLE_JOB}" ]; then rm -f /home/circleci/project/target/debug/deps/libcranelift_wasm* && rm -f /Users/distiller/project/target/debug/deps/libcranelift_wasm*; fi;
@@ -96,27 +96,27 @@ integration-tests: release
 
 # Utils
 lint:
-	cargo +nightly fmt --all -- --check
+	cargo fmt --all -- --check
 
 precommit: lint test
 
 build:
-	cargo +nightly build --release --features debug
+	cargo build --release --features debug
 
 install:
-	cargo +nightly install --release --path .
+	cargo install --release --path .
 
 release:
-	cargo +nightly build --release --features backend:singlepass,backend:llvm,loader:kernel
+	cargo build --release --features backend:singlepass,backend:llvm,loader:kernel
 
 # Only one backend (cranelift)
 release-fast:
 	# If you are in OS-X, you will need mingw-w64 for cross compiling to windows
 	# brew install mingw-w64
-	cargo +nightly build --release
+	cargo build --release
 
 bench:
-	cargo +nightly bench --all
+	cargo bench --all
 
 
 # Build utils
diff --git a/README.md b/README.md
index d4bf6b2b8..a851b3a45 100644
--- a/README.md
+++ b/README.md
@@ -153,6 +153,12 @@ nginx and Lua do not work on Windows. See [this issue](https://github.com/wasmer
 
 Wasmer is built with [Cargo](https://crates.io/), the Rust package manager.
 
+Set Rust Nightly:
+```
+rustup default nightly
+```
+
+And install Wasmer
 ```sh
 # checkout code
 git clone https://github.com/wasmerio/wasmer.git
@@ -170,6 +176,7 @@ Thanks to [spec tests](https://github.com/wasmerio/wasmer/tree/master/lib/specte
 You can run all the tests with:
 
 ```sh
+rustup default nightly
 make test
 ```
 
diff --git a/bors.toml b/bors.toml
index 3ccbdc008..c29be2c9f 100644
--- a/bors.toml
+++ b/bors.toml
@@ -2,7 +2,7 @@ status = [
     "ci/circleci: lint",
     "ci/circleci: test",
     "ci/circleci: test-macos",
-    "ci/circleci: test-rust-nightly",
+    "ci/circleci: test-stable",
     "continuous-integration/appveyor/branch"
 ]
 required_approvals = 1