diff --git a/lexical-core/Cargo.toml b/lexical-core/Cargo.toml
index c69043a7..e47732b8 100644
--- a/lexical-core/Cargo.toml
+++ b/lexical-core/Cargo.toml
@@ -10,6 +10,7 @@ name = "lexical-core"
 readme = "README.md"
 repository = "https://github.com/Alexhuszagh/rust-lexical"
 version = "1.0.2"
+rust-version = "1.63.0"
 exclude = [
     "assets/*",
     "docs/*",
diff --git a/lexical-parse-float/Cargo.toml b/lexical-parse-float/Cargo.toml
index 8ad2e2fe..2d76c215 100644
--- a/lexical-parse-float/Cargo.toml
+++ b/lexical-parse-float/Cargo.toml
@@ -10,6 +10,7 @@ name = "lexical-parse-float"
 readme = "README.md"
 repository = "https://github.com/Alexhuszagh/rust-lexical"
 version = "1.0.2"
+rust-version = "1.63.0"
 exclude = [
     "assets/*",
     "docs/*",
diff --git a/lexical-parse-integer/Cargo.toml b/lexical-parse-integer/Cargo.toml
index 5fb69a88..ed0ee3c6 100644
--- a/lexical-parse-integer/Cargo.toml
+++ b/lexical-parse-integer/Cargo.toml
@@ -10,6 +10,7 @@ name = "lexical-parse-integer"
 readme = "README.md"
 repository = "https://github.com/Alexhuszagh/rust-lexical"
 version = "1.0.2"
+rust-version = "1.63.0"
 exclude = [
     "assets/*",
     "docs/*",
diff --git a/lexical-util/Cargo.toml b/lexical-util/Cargo.toml
index 9873035e..78cca873 100644
--- a/lexical-util/Cargo.toml
+++ b/lexical-util/Cargo.toml
@@ -10,6 +10,7 @@ name = "lexical-util"
 readme = "README.md"
 repository = "https://github.com/Alexhuszagh/rust-lexical"
 version = "1.0.3"
+rust-version = "1.63.0"
 exclude = [
     "assets/*",
     "docs/*",
diff --git a/lexical-write-float/Cargo.toml b/lexical-write-float/Cargo.toml
index 5e336b35..77182501 100644
--- a/lexical-write-float/Cargo.toml
+++ b/lexical-write-float/Cargo.toml
@@ -10,6 +10,7 @@ name = "lexical-write-float"
 readme = "README.md"
 repository = "https://github.com/Alexhuszagh/rust-lexical"
 version = "1.0.2"
+rust-version = "1.63.0"
 exclude = [
     "assets/*",
     "docs/*",
diff --git a/lexical-write-integer/Cargo.toml b/lexical-write-integer/Cargo.toml
index ad546906..eb9c9f1f 100644
--- a/lexical-write-integer/Cargo.toml
+++ b/lexical-write-integer/Cargo.toml
@@ -10,6 +10,7 @@ name = "lexical-write-integer"
 readme = "README.md"
 repository = "https://github.com/Alexhuszagh/rust-lexical"
 version = "1.0.2"
+rust-version = "1.63.0"
 exclude = [
     "assets/*",
     "docs/*",
diff --git a/lexical/Cargo.toml b/lexical/Cargo.toml
index 5f0bf258..9576e66e 100644
--- a/lexical/Cargo.toml
+++ b/lexical/Cargo.toml
@@ -10,6 +10,7 @@ name = "lexical"
 readme = "README.md"
 repository = "https://github.com/Alexhuszagh/rust-lexical"
 version = "7.0.2"
+rust-version = "1.63.0"
 exclude = [
     "assets/*",
     "docs/*",