diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index aefdfaa..8f1c534 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,7 @@ jobs:
   build:
     strategy:
       matrix:
-        rust-version: ["1.70.0", "1.74.0", "1.78.0", "1.83.0", "1.87.0"]
+        rust-version: ["1.78.0", "1.83.0", "1.87.0", "1.99.0"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -25,7 +25,7 @@ jobs:
   build-no_std:
     strategy:
       matrix:
-        rust-version: ["1.70.0", "1.74.0", "1.78.0", "1.83.0", "1.87.0"]
+        rust-version: ["1.78.0", "1.83.0", "1.87.0", "1.99.0"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -38,7 +38,7 @@ jobs:
   test:
     strategy:
       matrix:
-        rust-version: ["1.70.0", "1.74.0", "1.78.0", "1.83.0", "1.87.0"]
+        rust-version: ["1.78.0", "1.83.0", "1.87.0", "1.99.0"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -50,7 +50,7 @@ jobs:
   test-no_std:
     strategy:
       matrix:
-        rust-version: ["1.70.0", "1.74.0", "1.78.0", "1.83.0", "1.87.0"]
+        rust-version: ["1.78.0", "1.83.0", "1.87.0", "1.99.0"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -62,7 +62,7 @@ jobs:
   clippy:
     strategy:
       matrix:
-        rust-version: ["1.70.0", "1.74.0", "1.78.0", "1.83.0", "1.87.0"]
+        rust-version: ["1.78.0", "1.83.0", "1.87.0", "1.99.0"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
diff --git a/Cargo.lock b/Cargo.lock
index 0b16df7..ad21228 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "anybuf"
diff --git a/Cargo.toml b/Cargo.toml
index 2ed64d5..14da738 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,6 +2,7 @@
 name = "anybuf"
 version = "1.0.0"
 edition = "2021"
+rust-version = "1.78"
 license = "Apache-2.0"
 description = "A minimal, zero dependency proto3 encoder to encode/decode anything. No schemas needed."
 keywords = ["protobuf3", "protobuf", "proto3", "proto", "encoding"]
diff --git a/src/bufany.rs b/src/bufany.rs
index 3c14411..9459027 100644
--- a/src/bufany.rs
+++ b/src/bufany.rs
@@ -846,7 +846,7 @@ impl<'a> Bufany<'a> {
 
     /// Gets the value of the given field number. This returns None if
     /// the field number does not exist
-    pub fn value(&self, field_number: u32) -> Option<Value> {
+    pub fn value(&self, field_number: u32) -> Option<Value<'_>> {
         self.value_ref(field_number).cloned()
     }
 
@@ -866,6 +866,10 @@ impl<'a> Bufany<'a> {
 }
 
 /// A deserialized value
+///
+/// The lifetime `'a` is the lifetime of the serialized input: variable length values
+/// (i.e. bytes and strings) borrow their bytes from it instead of copying them (zero-copy).
+/// When `Value<'a>` is cloned, the clone still borrows the original data.
 #[derive(Debug, PartialEq, Clone)]
 pub enum Value<'a> {
     /// Unknown varint (wire type = 0).