diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index d6adb32..59799a4 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -10,7 +10,7 @@ jobs:
       matrix:
         rust:
           - stable
-          - 1.53.0
+          - 1.63.0
           - nightly
     steps:
       - uses: actions/checkout@v2
@@ -21,6 +21,9 @@ jobs:
           override: true
       - name: Cargo update
         run: cargo update
+      - name: Cargo update (fix for MSRV)
+        run: cargo update -p time --precise 0.3.20
+        if: matrix.rust == '1.63.0'
       - uses: actions-rs/cargo@v1
         with:
           command: check
diff --git a/README.md b/README.md
index 80fa4f6..a1a3a7b 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 [![crates.io](https://img.shields.io/crates/v/asn1-rs.svg)](https://crates.io/crates/asn1-rs)
 [![Download numbers](https://img.shields.io/crates/d/asn1-rs.svg)](https://crates.io/crates/asn1-rs)
 [![Github CI](https://github.com/rusticata/asn1-rs/workflows/Continuous%20integration/badge.svg)](https://github.com/rusticata/asn1-rs/actions)
-[![Minimum rustc version](https://img.shields.io/badge/rustc-1.53.0+-lightgray.svg)](#rust-version-requirements)
+[![Minimum rustc version](https://img.shields.io/badge/rustc-1.63.0+-lightgray.svg)](#rust-version-requirements)
 
 # BER/DER Parsers/Encoders
 
@@ -44,9 +44,7 @@ of `nom::IResult`. This means that most `nom` combinators (`map`, `many0`, etc.)
 combination to objects and methods from this crate. Reading the nom documentation may
 help understanding how to write and combine parsers and use the output.
 
-**Minimum Supported Rust Version**: 1.53.0
-
-Note: if the `bits` feature is enabled, MSRV is 1.56.0 (due to `bitvec` 1.0)
+**Minimum Supported Rust Version**: 1.63.0
 
 # Recipes
 
diff --git a/src/lib.rs b/src/lib.rs
index c1275f3..4b6e250 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,7 +4,7 @@
 //! [![crates.io](https://img.shields.io/crates/v/asn1-rs.svg)](https://crates.io/crates/asn1-rs)
 //! [![Download numbers](https://img.shields.io/crates/d/asn1-rs.svg)](https://crates.io/crates/asn1-rs)
 //! [![Github CI](https://github.com/rusticata/asn1-rs/workflows/Continuous%20integration/badge.svg)](https://github.com/rusticata/asn1-rs/actions)
-//! [![Minimum rustc version](https://img.shields.io/badge/rustc-1.53.0+-lightgray.svg)](#rust-version-requirements)
+//! [![Minimum rustc version](https://img.shields.io/badge/rustc-1.63.0+-lightgray.svg)](#rust-version-requirements)
 //!
 //! # BER/DER Parsers/Encoders
 //!
@@ -42,9 +42,7 @@
 //! combination to objects and methods from this crate. Reading the nom documentation may
 //! help understanding how to write and combine parsers and use the output.
 //!
-//! **Minimum Supported Rust Version**: 1.53.0
-//!
-//! Note: if the `bits` feature is enabled, MSRV is 1.56.0 (due to `bitvec` 1.0)
+//! **Minimum Supported Rust Version**: 1.63.0
 //!
 //! # Recipes
 //!