diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a55ef071..1e79e9d6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -83,7 +83,7 @@ jobs:
   # MANDATORY TESTING USING LOWEST SUPPORTED TOOLCHAIN
   lowest_supported:
     env:
-      TOOLCHAIN: 1.62.1  # LOWEST SUPPORTED RUST TOOLCHAIN
+      TOOLCHAIN: 1.66.1  # LOWEST SUPPORTED RUST TOOLCHAIN
     strategy:
       matrix:
         include:
@@ -109,7 +109,7 @@ jobs:
   fedora:
     env:
       # Lowest supported
-      TOOLCHAIN: 1.62.1  # LOWEST SUPPORTED RUST TOOLCHAIN
+      TOOLCHAIN: 1.66.1  # LOWEST SUPPORTED RUST TOOLCHAIN
     strategy:
       matrix:
         include:
diff --git a/Cargo.toml b/Cargo.toml
index 3f289ad1..abe7ab03 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,7 @@ name = "libcryptsetup-rs"
 version = "0.6.0"
 authors = ["John Baublitz <jbaublitz@redhat.com>"]
 edition = "2021"
-rust-version = "1.62.1"  # LOWEST SUPPORTED RUST TOOLCHAIN
+rust-version = "1.66.1"  # LOWEST SUPPORTED RUST TOOLCHAIN
 description = "High level Rust bindings for libcryptsetup"
 license = "MPL-2.0"
 documentation = "https://docs.rs/libcryptsetup-rs"
diff --git a/libcryptsetup-rs-sys/Cargo.toml b/libcryptsetup-rs-sys/Cargo.toml
index 9b644a04..1956d42f 100644
--- a/libcryptsetup-rs-sys/Cargo.toml
+++ b/libcryptsetup-rs-sys/Cargo.toml
@@ -3,7 +3,7 @@ name = "libcryptsetup-rs-sys"
 version = "0.2.1"
 authors = ["John Baublitz <jbaublitz@redhat.com>"]
 edition = "2021"
-rust-version = "1.62.1"  # LOWEST SUPPORTED RUST TOOLCHAIN
+rust-version = "1.66.1"  # LOWEST SUPPORTED RUST TOOLCHAIN
 description = "Low level bindings for libcryptsetup"
 license = "MPL-2.0"
 documentation = "https://docs.rs/libcryptsetup-rs-sys"