diff --git a/.github/workflows/build-rust-aarch64-apple-darwin-self-hosted-dispatch.yaml b/.github/workflows/build-rust-aarch64-apple-darwin-self-hosted-dispatch.yaml
index 2c66506d..fc170d92 100644
--- a/.github/workflows/build-rust-aarch64-apple-darwin-self-hosted-dispatch.yaml
+++ b/.github/workflows/build-rust-aarch64-apple-darwin-self-hosted-dispatch.yaml
@@ -14,7 +14,7 @@ on:
       release_version:
         description: "Release Version for generation"
         required: true
-        default: '1.65.0.1'
+        default: '1.66.0.0'
       rust_version:
         description: "Version of esp rust to use"
         required: true
diff --git a/.github/workflows/build-rust-aarch64-unknown-linux-gnu-self-hosted-dispatch.yaml b/.github/workflows/build-rust-aarch64-unknown-linux-gnu-self-hosted-dispatch.yaml
index 8cccc727..7b78b8ae 100644
--- a/.github/workflows/build-rust-aarch64-unknown-linux-gnu-self-hosted-dispatch.yaml
+++ b/.github/workflows/build-rust-aarch64-unknown-linux-gnu-self-hosted-dispatch.yaml
@@ -14,7 +14,7 @@ on:
       release_version:
         description: "Release Version for generation"
         required: true
-        default: '1.65.0.1'
+        default: '1.66.0.0'
       rust_version:
         description: "Version of esp rust to use"
         required: true
diff --git a/.github/workflows/build-rust-src-dispatch.yaml b/.github/workflows/build-rust-src-dispatch.yaml
index f8b870e4..b3c8c835 100644
--- a/.github/workflows/build-rust-src-dispatch.yaml
+++ b/.github/workflows/build-rust-src-dispatch.yaml
@@ -14,7 +14,7 @@ on:
       release_version:
         description: "Release Version for generation"
         required: true
-        default: '1.65.0.1'
+        default: '1.66.0.0'
       rust_version:
         description: "Version of esp rust to use"
         required: true
diff --git a/.github/workflows/build-rust-x86_64-apple-darwin-self-hosted-dispatch.yaml b/.github/workflows/build-rust-x86_64-apple-darwin-self-hosted-dispatch.yaml
index a19ea0f9..a4185a22 100644
--- a/.github/workflows/build-rust-x86_64-apple-darwin-self-hosted-dispatch.yaml
+++ b/.github/workflows/build-rust-x86_64-apple-darwin-self-hosted-dispatch.yaml
@@ -14,7 +14,7 @@ on:
       release_version:
         description: "Release Version for generation"
         required: true
-        default: '1.65.0.1'
+        default: '1.66.0.0'
       rust_version:
         description: "Version of esp rust to use"
         required: true
diff --git a/.github/workflows/build-rust-x86_64-pc-windows-gnu-self-hosted-dispatch.yaml b/.github/workflows/build-rust-x86_64-pc-windows-gnu-self-hosted-dispatch.yaml
index 8a90aca3..6220bce1 100644
--- a/.github/workflows/build-rust-x86_64-pc-windows-gnu-self-hosted-dispatch.yaml
+++ b/.github/workflows/build-rust-x86_64-pc-windows-gnu-self-hosted-dispatch.yaml
@@ -14,7 +14,7 @@ on:
       release_version:
         description: "Release Version for generation"
         required: true
-        default: '1.65.0.1'
+        default: '1.66.0.0'
       rust_version:
         description: "Version of esp rust to use"
         required: true
diff --git a/.github/workflows/build-rust-x86_64-pc-windows-msvc-self-hosted-dispatch.yaml b/.github/workflows/build-rust-x86_64-pc-windows-msvc-self-hosted-dispatch.yaml
index ad26a21f..4c9baa6b 100644
--- a/.github/workflows/build-rust-x86_64-pc-windows-msvc-self-hosted-dispatch.yaml
+++ b/.github/workflows/build-rust-x86_64-pc-windows-msvc-self-hosted-dispatch.yaml
@@ -14,7 +14,7 @@ on:
       release_version:
         description: "Release Version for generation"
         required: true
-        default: '1.65.0.1'
+        default: '1.66.0.0'
       rust_version:
         description: "Version of esp rust to use"
         required: true
diff --git a/.github/workflows/build-rust-x86_64-unknown-linux-gnu-self-hosted-dispatch.yaml b/.github/workflows/build-rust-x86_64-unknown-linux-gnu-self-hosted-dispatch.yaml
index 65508da2..e61e22c7 100644
--- a/.github/workflows/build-rust-x86_64-unknown-linux-gnu-self-hosted-dispatch.yaml
+++ b/.github/workflows/build-rust-x86_64-unknown-linux-gnu-self-hosted-dispatch.yaml
@@ -14,7 +14,7 @@ on:
       release_version:
         description: "Release Version for generation"
         required: true
-        default: "1.65.0.1"
+        default: "1.66.0.0"
       rust_version:
         description: "Version of esp rust to use"
         required: true
diff --git a/.github/workflows/installer-check.yaml b/.github/workflows/installer-check.yaml
index 778c79aa..83ea4d8e 100644
--- a/.github/workflows/installer-check.yaml
+++ b/.github/workflows/installer-check.yaml
@@ -1,7 +1,7 @@
 name: Test installer by building template projects
 
 env:
-  xtensa-toolchain-version: "1.65.0.1"
+  xtensa-toolchain-version: "1.66.0.0"
 
 on:
   push:
diff --git a/.github/workflows/publish-idf-rust-examples-image.yml b/.github/workflows/publish-idf-rust-examples-image.yml
index 2ece4e0d..77d53c4f 100644
--- a/.github/workflows/publish-idf-rust-examples-image.yml
+++ b/.github/workflows/publish-idf-rust-examples-image.yml
@@ -10,11 +10,11 @@ on:
       release_version:
         description: "Release version - long 4 places for tag"
         required: true
-        default: "1.65.0.1"
+        default: "1.66.0.0"
       rust_patch_version:
         description: "Release patch version for generation - 3 places for tag"
         required: true
-        default: "1.65.0"
+        default: "1.66.0"
       rust_minor_version:
         description: "Release minor version - 2 places for tag"
         required: true
diff --git a/.github/workflows/publish-idf-rust-image.yml b/.github/workflows/publish-idf-rust-image.yml
index 8e555a8d..8b5e9f9c 100644
--- a/.github/workflows/publish-idf-rust-image.yml
+++ b/.github/workflows/publish-idf-rust-image.yml
@@ -10,11 +10,11 @@ on:
       release_version:
         description: "Release version - long 4 places for tag"
         required: true
-        default: "1.65.0.1"
+        default: "1.66.0.0"
       rust_patch_version:
         description: "Release patch version for generation - 3 places for tag"
         required: true
-        default: "1.65.0"
+        default: "1.66.0"
       rust_minor_version:
         description: "Release minor version - 2 places for tag"
         required: true
diff --git a/.github/workflows/publish-idf-rust-tags.yml b/.github/workflows/publish-idf-rust-tags.yml
index 9c06ad26..3e4ebac5 100644
--- a/.github/workflows/publish-idf-rust-tags.yml
+++ b/.github/workflows/publish-idf-rust-tags.yml
@@ -10,7 +10,7 @@ on:
       toolchain-version:
         description: "Version of Rust toolchain"
         required: true
-        default: "1.65.0.1"
+        default: "1.66.0.0"
 
 jobs:
   esp-idf:
diff --git a/.github/workflows/release-installer-dispatch.yaml b/.github/workflows/release-installer-dispatch.yaml
index e524d859..56c75c54 100644
--- a/.github/workflows/release-installer-dispatch.yaml
+++ b/.github/workflows/release-installer-dispatch.yaml
@@ -10,11 +10,11 @@ on:
       release_version:
         description: "Release Version for generation"
         required: true
-        default: "1.65.0.1"
+        default: "1.66.0.0"
       rust_version:
         description: "Version of esp rust to use"
         required: true
-        default: "1.65.0"
+        default: "1.66.0"
 
 # We Break this down into individual jobs to avoid disk space issues
 jobs:
diff --git a/.github/workflows/test-rust-aarch64-apple-darwin-dispatch.yaml b/.github/workflows/test-rust-aarch64-apple-darwin-dispatch.yaml
index d2bc6824..591b4904 100644
--- a/.github/workflows/test-rust-aarch64-apple-darwin-dispatch.yaml
+++ b/.github/workflows/test-rust-aarch64-apple-darwin-dispatch.yaml
@@ -10,7 +10,7 @@ on:
       toolchain_version:
         description: "Version of Rust IDF toolchain"
         required: true
-        default: "1.65.0.1"
+        default: "1.66.0.0"
       target:
         description: "Target to build (e.g. xtensa-esp32-espidf)"
         required: true
diff --git a/.github/workflows/test-rust-x86_64-apple-darwin-dispatch.yaml b/.github/workflows/test-rust-x86_64-apple-darwin-dispatch.yaml
index 651ead1d..0f853192 100644
--- a/.github/workflows/test-rust-x86_64-apple-darwin-dispatch.yaml
+++ b/.github/workflows/test-rust-x86_64-apple-darwin-dispatch.yaml
@@ -10,7 +10,7 @@ on:
       toolchain_version:
         description: "Version of Rust IDF toolchain"
         required: true
-        default: "1.65.0.1"
+        default: "1.66.0.0"
 
 jobs:
   build-idf-rust-examples:
diff --git a/.github/workflows/test-rust-x86_64-pc-windows-msvc-dispatch.yaml b/.github/workflows/test-rust-x86_64-pc-windows-msvc-dispatch.yaml
index 2da95383..95d96545 100644
--- a/.github/workflows/test-rust-x86_64-pc-windows-msvc-dispatch.yaml
+++ b/.github/workflows/test-rust-x86_64-pc-windows-msvc-dispatch.yaml
@@ -10,7 +10,7 @@ on:
       toolchain_version:
         description: "Version of Rust IDF toolchain"
         required: true
-        default: "1.65.0.1"
+        default: "1.66.0.0"
 
 jobs:
   build-idf-rust-examples:
diff --git a/.github/workflows/test-rust-x86_64-pc-windows-msvc-self-hosted-dispatch.yaml b/.github/workflows/test-rust-x86_64-pc-windows-msvc-self-hosted-dispatch.yaml
index df95ea73..3080fb84 100644
--- a/.github/workflows/test-rust-x86_64-pc-windows-msvc-self-hosted-dispatch.yaml
+++ b/.github/workflows/test-rust-x86_64-pc-windows-msvc-self-hosted-dispatch.yaml
@@ -20,7 +20,7 @@ jobs:
             ARCH: ""
             TARGET: win-x64
             ASSET_PATH: "build/dist/esp.zip"
-            ASSET_NAME: "rust-1.65.0.1-x86_64-pc-windows-msvc.zip"
+            ASSET_NAME: "rust-1.66.0.0-x86_64-pc-windows-msvc.zip"
             ASSET_CONTENT_TYPE: "application/zip"
             LLVM_ROOT_OPTION: "--llvm-root=C:/llvm-project"
     steps:
diff --git a/.github/workflows/test-rust-x86_64-unknown-linux-gnu-dispatch.yaml b/.github/workflows/test-rust-x86_64-unknown-linux-gnu-dispatch.yaml
index 5ba70e7f..5d9087f3 100644
--- a/.github/workflows/test-rust-x86_64-unknown-linux-gnu-dispatch.yaml
+++ b/.github/workflows/test-rust-x86_64-unknown-linux-gnu-dispatch.yaml
@@ -10,7 +10,7 @@ on:
       toolchain_version:
         description: "Version of Rust IDF toolchain"
         required: true
-        default: "1.65.0.1"
+        default: "1.66.0.0"
       esp_idf_version:
         description: "Version of ESP-IDF for the build"
         required: true
diff --git a/Install-RustToolchain.ps1 b/Install-RustToolchain.ps1
index 3889a13e..0df62883 100644
--- a/Install-RustToolchain.ps1
+++ b/Install-RustToolchain.ps1
@@ -7,7 +7,7 @@ param (
     [String]
     $ExportFile = 'Export-EspRust.ps1',
     [String]
-    $ToolchainVersion = '1.65.0.1',
+    $ToolchainVersion = '1.66.0.0',
     [String]
     $ToolchainDestination = "${HOME}/.rustup/toolchains/esp",
     [String]
diff --git a/README.md b/README.md
index 44caef4d..3b6426b0 100644
--- a/README.md
+++ b/README.md
@@ -50,14 +50,14 @@ Download the installer from the [Release section](https://github.com/esp-rs/rust
 #### Download installer in Bash
 
 ```bash
-curl -LO https://github.com/esp-rs/rust-build/releases/download/v1.65.0.1/install-rust-toolchain.sh
+curl -LO https://github.com/esp-rs/rust-build/releases/download/v1.66.0.0/install-rust-toolchain.sh
 chmod a+x install-rust-toolchain.sh
 ```
 
 #### Download installer in PowerShell
 
 ```powershell
-Invoke-WebRequest 'https://github.com/esp-rs/rust-build/releases/download/v1.65.0.1/Install-RustToolchain.ps1' -OutFile .\Install-RustToolchain.ps1
+Invoke-WebRequest 'https://github.com/esp-rs/rust-build/releases/download/v1.66.0.0/Install-RustToolchain.ps1' -OutFile .\Install-RustToolchain.ps1
 ```
 
 ### Linux and macOS
@@ -91,7 +91,7 @@ Run `./install-rust-toolchain.sh --help` for more information about arguments.
 Installation of different version of the toolchain:
 
 ```
-./install-rust-toolchain.sh --toolchain-version 1.65.0.1
+./install-rust-toolchain.sh --toolchain-version 1.66.0.0
 . ./export-esp.sh
 ```
 
@@ -209,7 +209,7 @@ Export variables are displayed at the end of the output from the script.
 Installation of different versions of toolchain:
 
 ```sh
-./Install-RustToolchain.ps1 -ToolchainVersion 1.65.0.1
+./Install-RustToolchain.ps1 -ToolchainVersion 1.66.0.0
 . ./Export-EspRust.ps1
 ```
 
diff --git a/Test-RustToolchain.ps1 b/Test-RustToolchain.ps1
index f4e0538d..4ec4ee69 100644
--- a/Test-RustToolchain.ps1
+++ b/Test-RustToolchain.ps1
@@ -5,7 +5,7 @@ param (
     [ValidateSet("x86_64-pc-windows-msvc", "x86_64-pc-windows-gnu")]
     $DefaultHost = "x86_64-pc-windows-msvc",
     [String]
-    $ToolchainVersion = '1.65.0.1',
+    $ToolchainVersion = '1.66.0.0',
     [String]
     [ValidateSet("xtensa-esp32-espidf", "xtensa-esp32s2-espidf", "xtensa-esp32s3-espidf", "riscv32imc-esp-espidf")]
     $Target = "xtensa-esp32-espidf",
diff --git a/idf-rust.Containerfile b/idf-rust.Containerfile
index d1ae909b..f5b8840a 100644
--- a/idf-rust.Containerfile
+++ b/idf-rust.Containerfile
@@ -8,7 +8,7 @@ ENV LANG=C.UTF-8
 ARG CONTAINER_USER=esp
 ARG CONTAINER_GROUP=esp
 ARG NIGHTLY_TOOLCHAIN_VERSION=nightly
-ARG XTENSA_TOOLCHAIN_VERSION=1.65.0.1
+ARG XTENSA_TOOLCHAIN_VERSION=1.66.0.0
 ARG ESP_IDF_VERSION=""
 ARG ESP_BOARD=esp32,esp32s2,esp32s3
 ARG INSTALL_RUST_TOOLCHAIN=install-rust-toolchain.sh
diff --git a/install-rust-toolchain.sh b/install-rust-toolchain.sh
index 6804ff24..0c2394bb 100755
--- a/install-rust-toolchain.sh
+++ b/install-rust-toolchain.sh
@@ -4,7 +4,7 @@ set -eu
 #set -v
 
 # Default values
-TOOLCHAIN_VERSION="1.65.0.1"
+TOOLCHAIN_VERSION="1.66.0.0"
 RUSTUP_HOME="${RUSTUP_HOME:-${HOME}/.rustup}"
 CARGO_HOME="${CARGO_HOME:-${HOME}/.cargo}"
 TOOLCHAIN_DESTINATION_DIR="${RUSTUP_HOME}/toolchains/esp"
diff --git a/support/rust-build/Repackage-RustRelease.ps1 b/support/rust-build/Repackage-RustRelease.ps1
index 63a03603..a5731b4f 100644
--- a/support/rust-build/Repackage-RustRelease.ps1
+++ b/support/rust-build/Repackage-RustRelease.ps1
@@ -11,7 +11,7 @@ param (
 $ErrorActionPreference = "Stop"
 
 $RustVersion="nightly"
-$ReleaseVersion="1.65.0.1"
+$ReleaseVersion="1.66.0.0"
 
 if (Test-Path -Path esp -PathType Container) {
     Remove-Item -Recurse -Force -Path esp
diff --git a/support/rust-build/rename-rust-release.sh b/support/rust-build/rename-rust-release.sh
index e6b56fb9..9dfecc7d 100755
--- a/support/rust-build/rename-rust-release.sh
+++ b/support/rust-build/rename-rust-release.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
-for I in *1.65.0-dev*; do
-     NEW_NAME=`echo $I | sed -e 's/1.65.0-dev/1.65.0.1/g'`
+for I in *1.66.0-dev*; do
+     NEW_NAME=`echo $I | sed -e 's/1.66.0-dev/1.66.0.0/g'`
      mv $I $NEW_NAME
 done
 
diff --git a/test-rust-toolchain.sh b/test-rust-toolchain.sh
index 00b5465f..2f0939cb 100755
--- a/test-rust-toolchain.sh
+++ b/test-rust-toolchain.sh
@@ -3,7 +3,7 @@
 set -e
 
 # Default values
-TOOLCHAIN_VERSION="1.65.0.1"
+TOOLCHAIN_VERSION="1.66.0.0"
 if [ -z "${RUSTUP_HOME}" ]; then
   RUSTUP_HOME="${HOME}/.rustup"
 fi