diff --git a/.cirrus.yml b/.cirrus.yml
index 0929f1d1d..43b0b51fd 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-2019-07-09
+    - sh rustup.sh -y --default-toolchain nightly-2019-07-17
     - . $HOME/.cargo/env
     - rustup target add i686-unknown-freebsd
     - |
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 7f53d44d6..210b9767f 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -2,7 +2,7 @@ trigger: ["master", "std-future"]
 pr: ["master", "std-future"]
 
 variables:
-  nightly: nightly-2019-07-09
+  nightly: nightly-2019-07-17
 
 jobs:
 # Check formatting