diff --git a/Dockerfile b/Dockerfile
index 73507be300e..5aa9207cb5b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM circleci/rust:1.38.0-stretch as wasmer-build-env
+FROM circleci/rust:1.39.0-stretch as wasmer-build-env
 RUN sudo apt-get update && \
   sudo apt-get install -y --no-install-recommends \
   cmake \
diff --git a/README.md b/README.md
index 0391bbd9b97..53d339317c1 100644
--- a/README.md
+++ b/README.md
@@ -168,7 +168,7 @@ nginx and Lua do not work on Windows - you can track the progress on [this issue
 
 ## Building
 
-[![Rustc Version 1.38+](https://img.shields.io/badge/rustc-1.37+-red.svg?style=flat-square)](https://blog.rust-lang.org/2019/09/26/Rust-1.38.0.html)
+[![Rustc Version 1.39+](https://img.shields.io/badge/rustc-1.39+-red.svg?style=flat-square)](https://blog.rust-lang.org/2019/11/07/Rust-1.39.0.html)
 
 Wasmer is built with [Cargo](https://crates.io/), the Rust package manager.
 
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 6308d422bc6..505d2f4b9ef 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -22,24 +22,24 @@ jobs:
       - script: cargo fmt --all -- --check
         displayName: Lint
     variables:
-      rust_toolchain: '1.38.0'
+      rust_toolchain: '1.39.0'
 
   - job: Test
     strategy:
       matrix:
         linux:
           imageName: "ubuntu-16.04"
-          rust_toolchain: nightly-2019-08-15
+          rust_toolchain: nightly-2019-12-19
         mac:
           imageName: "macos-10.14"
-          rust_toolchain: nightly-2019-08-15
+          rust_toolchain: nightly-2019-12-19
           # By default schannel checks revocation of certificates unlike some other SSL
           # backends, but we've historically had problems on CI where a revocation
           # server goes down presumably. See #43333 for more info
           CARGO_HTTP_CHECK_REVOKE: false
         windows:
           imageName: "vs2017-win2016"
-          rust_toolchain: '1.38.0'
+          rust_toolchain: '1.39.0'
     pool:
       vmImage: $(imageName)
     condition: in(variables['Build.SourceBranch'], 'refs/heads/master', 'refs/heads/staging', 'refs/heads/trying')
@@ -75,7 +75,7 @@ jobs:
     pool:
       vmImage: "ubuntu-16.04"
     variables:
-      rust_toolchain: nightly-2019-08-15
+      rust_toolchain: nightly-2019-12-19
     condition: in(variables['Build.SourceBranch'], 'refs/heads/master', 'refs/heads/staging', 'refs/heads/trying')
     steps:
       - checkout: self
@@ -93,14 +93,14 @@ jobs:
       matrix:
         linux:
           imageName: "ubuntu-16.04"
-          rust_toolchain: nightly-2019-08-15
+          rust_toolchain: nightly-2019-12-19
         mac:
           imageName: "macos-10.14"
-          rust_toolchain: nightly-2019-08-15
+          rust_toolchain: nightly-2019-12-19
           MACOSX_DEPLOYMENT_TARGET: 10.10
         windows:
           imageName: "vs2017-win2016"
-          rust_toolchain: '1.38.0'
+          rust_toolchain: '1.39.0'
           # RUSTFLAGS: -Ctarget-feature=+crt-static
     pool:
       vmImage: $(imageName)
@@ -160,14 +160,14 @@ jobs:
       matrix:
         linux:
           imageName: "ubuntu-16.04"
-          rust_toolchain: nightly-2019-08-15
+          rust_toolchain: nightly-2019-12-19
         mac:
           imageName: "macos-10.14"
-          rust_toolchain: nightly-2019-08-15
+          rust_toolchain: nightly-2019-12-19
           MACOSX_DEPLOYMENT_TARGET: 10.10
         windows:
           imageName: "vs2017-win2016"
-          rust_toolchain: '1.38.0'
+          rust_toolchain: '1.39.0'
           # RUSTFLAGS: -Ctarget-feature=+crt-static
     pool:
       vmImage: $(imageName)
@@ -248,7 +248,7 @@ jobs:
     pool:
       vmImage: "ubuntu-16.04"
     variables:
-      rust_toolchain: nightly-2019-08-15
+      rust_toolchain: nightly-2019-12-19
     steps:
       - checkout: self
         submodules: true