diff --git a/.cirrus.yml b/.cirrus.yml
index e78c2d015d2..bcf2c2a9da2 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -13,7 +13,7 @@ task:
     - pkg install -y curl
     - curl https://sh.rustup.rs -sSf --output rustup.sh
     # TODO: switch back to nightly
-    - sh rustup.sh -y --default-toolchain nightly-2019-07-17
+    - sh rustup.sh -y --default-toolchain nightly-2019-08-07
     - . $HOME/.cargo/env
     - rustup target add i686-unknown-freebsd
     - |
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 22cd40e1380..11ed02f2435 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -2,7 +2,7 @@ trigger: ["master", "std-future"]
 pr: ["master", "std-future"]
 
 variables:
-  nightly: nightly-2019-07-17
+  nightly: nightly-2019-08-07
 
 jobs:
 # Check formatting
diff --git a/rust-toolchain b/rust-toolchain
index fead76e739c..b7758e8c4a6 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2019-07-17
\ No newline at end of file
+nightly-2019-08-07