diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c19bf1e..390c802 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -40,7 +40,7 @@ jobs:
         - { name: macOS, os: macos-latest, triple: x86_64-apple-darwin }
         - { name: Windows, os: windows-2022, triple: x86_64-pc-windows-msvc }
         version:
-        - 1.64.0 # MSRV
+        - 1.70.0 # MSRV
         - stable
     steps:
       - uses: actions/checkout@v2
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9f3e794..a051db4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 0.12.0 (2023-xx-xx)
+
+- Fix to ensure freq is capitalized in the string representation
+- MSRV is bumped to `v1.70.0` from `v1.64.0`
+
 ## 0.11.0 (2023-07-18)
 
 ### Changed
diff --git a/Cargo.toml b/Cargo.toml
index d7a69c6..88b6c33 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,13 +1,14 @@
 [workspace.package]
 license = "MIT OR Apache-2.0"
 edition = "2021"
-rust-version = "1.64.0"
+rust-version = "1.70.0"
 
 [workspace]
 members = [
     "rrule",
     "rrule-debugger",
 ]
+resolver = "2"
 
 # These are the 2 packages to mainly work on.
 # So `cargo test` and `cargo run` both work.
diff --git a/rrule/src/core/rrule.rs b/rrule/src/core/rrule.rs
index d7cfd2a..b3fadde 100644
--- a/rrule/src/core/rrule.rs
+++ b/rrule/src/core/rrule.rs
@@ -43,13 +43,13 @@ pub enum Frequency {
 impl Display for Frequency {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         let name = match self {
-            Self::Yearly => "yearly",
-            Self::Monthly => "monthly",
-            Self::Weekly => "weekly",
-            Self::Daily => "daily",
-            Self::Hourly => "hourly",
-            Self::Minutely => "minutely",
-            Self::Secondly => "secondly",
+            Self::Yearly => "YEARLY",
+            Self::Monthly => "MONTHLY",
+            Self::Weekly => "WEEKLY",
+            Self::Daily => "DAILY",
+            Self::Hourly => "HOURLY",
+            Self::Minutely => "MINUTELY",
+            Self::Secondly => "SECONDLY",
         };
         write!(f, "{}", name)
     }
@@ -111,7 +111,7 @@ fn n_weekday_cmp(val1: NWeekday, val2: NWeekday) -> Ordering {
 
 impl PartialOrd for NWeekday {
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        Some(n_weekday_cmp(*self, *other))
+        Some(self.cmp(other))
     }
 }
 
diff --git a/rrule/src/tests/regression.rs b/rrule/src/tests/regression.rs
index 95ebc32..debfbc2 100644
--- a/rrule/src/tests/regression.rs
+++ b/rrule/src/tests/regression.rs
@@ -1,5 +1,7 @@
+use chrono::Month;
+
 use crate::tests::common;
-use crate::RRuleSet;
+use crate::{Frequency, RRule, RRuleSet};
 
 #[test]
 fn issue_34() {
@@ -45,3 +47,16 @@ fn issue_61() {
     let res = rrule_set.all(10).dates;
     assert_eq!(res.len(), 10);
 }
+
+// Frequency should be capitalized
+#[test]
+fn issue_97() {
+    let rrule = RRule::new(Frequency::Yearly)
+        .by_month_day((24..=26).collect())
+        .by_month(&[Month::December]);
+
+    assert_eq!(
+        rrule.to_string(),
+        "FREQ=YEARLY;BYMONTH=12;BYMONTHDAY=24,25,26"
+    );
+}