diff --git a/packages/datetime/package.json b/packages/datetime/package.json
index 58967d54c6..8cec740563 100644
--- a/packages/datetime/package.json
+++ b/packages/datetime/package.json
@@ -46,7 +46,6 @@
         "classnames": "^2.3.1",
         "date-fns": "^2.28.0",
         "date-fns-tz": "^2.0.0",
-        "lodash": "^4.17.21",
         "react-day-picker": "7.4.9",
         "tslib": "~2.6.2"
     },
@@ -65,7 +64,6 @@
         "@blueprintjs/karma-build-scripts": "workspace:^",
         "@blueprintjs/node-build-scripts": "workspace:^",
         "@blueprintjs/test-commons": "workspace:^",
-        "@types/lodash": "~4.14.202",
         "enzyme": "^3.11.0",
         "karma": "^6.4.2",
         "mocha": "^10.2.0",
diff --git a/packages/datetime/src/common/getTimezone.ts b/packages/datetime/src/common/getTimezone.ts
index bc92995d12..b628b59475 100644
--- a/packages/datetime/src/common/getTimezone.ts
+++ b/packages/datetime/src/common/getTimezone.ts
@@ -14,22 +14,23 @@
  * limitations under the License.
  */
 
-import memoize from "lodash/memoize";
-
 import { UTC_TIME } from "./timezoneItems";
 
 /**
- * Gets the users current time zone, for example "Europe/Oslo".
- * This is currently backed by the browser or computer's locale setting.
+ * Keep the returned timezone constant for a page load.
  */
-export const getCurrentTimezone: () => string = memoize(guessTimezone);
+let memoizedTimezone: string | null = null;
 
 /**
- * Unsupported in IE, which newer Blueprint components do not support.
- * In the unlikely case that the browser API returns undefined, we default to UTC.
- *
- * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/resolvedOptions
+ * Gets the users current time zone, for example "Europe/Oslo".
+ * This is currently backed by the browser or computer's locale setting.
  */
-function guessTimezone(): string {
-    return Intl.DateTimeFormat().resolvedOptions().timeZone ?? UTC_TIME.ianaCode;
+export function getCurrentTimezone(): string {
+    if (memoizedTimezone === null) {
+        // Unsupported in IE, which newer Blueprint components do not support.
+        // In the unlikely case that the browser API returns undefined, we default to UTC.
+        // @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/resolvedOptions
+        memoizedTimezone = Intl.DateTimeFormat().resolvedOptions().timeZone ?? UTC_TIME.ianaCode;
+    }
+    return memoizedTimezone;
 }
diff --git a/packages/datetime/src/common/timezoneUtils.ts b/packages/datetime/src/common/timezoneUtils.ts
index b221923fc9..d75bbb4a83 100644
--- a/packages/datetime/src/common/timezoneUtils.ts
+++ b/packages/datetime/src/common/timezoneUtils.ts
@@ -15,7 +15,6 @@
  */
 
 import { formatInTimeZone, utcToZonedTime, zonedTimeToUtc } from "date-fns-tz";
-import isEmpty from "lodash/isEmpty";
 
 import { getCurrentTimezone } from "./getTimezone";
 import { TimePrecision } from "./timePrecision";
@@ -69,7 +68,9 @@ export function getDateObjectFromIsoString(
     if (value === undefined) {
         return undefined;
     }
-    if (value === null || isEmpty(value)) {
+    // This function previously used lodash.isEmpty to check for empty values, which returns true for e.g. numbers and Dates.
+    // Be extra defensive and avoid breakage in case a consumer is incorrectly passing in such a value.
+    if (value === null || value === "" || typeof value !== "string") {
         return null;
     }
     const date = new Date(value);
diff --git a/packages/datetime2/package.json b/packages/datetime2/package.json
index 9b061cabb5..1a39bf6fbd 100644
--- a/packages/datetime2/package.json
+++ b/packages/datetime2/package.json
@@ -61,7 +61,6 @@
         "@blueprintjs/karma-build-scripts": "workspace:^",
         "@blueprintjs/node-build-scripts": "workspace:^",
         "@blueprintjs/test-commons": "workspace:^",
-        "@types/lodash": "~4.14.202",
         "enzyme": "^3.11.0",
         "karma": "^6.4.2",
         "mocha": "^10.2.0",
diff --git a/yarn.lock b/yarn.lock
index aa55fab869..b622691cc1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -496,7 +496,6 @@ __metadata:
     "@blueprintjs/karma-build-scripts": "workspace:^"
     "@blueprintjs/node-build-scripts": "workspace:^"
     "@blueprintjs/test-commons": "workspace:^"
-    "@types/lodash": "npm:~4.14.202"
     classnames: "npm:^2.3.1"
     date-fns: "npm:^2.28.0"
     enzyme: "npm:^3.11.0"
@@ -531,13 +530,11 @@ __metadata:
     "@blueprintjs/node-build-scripts": "workspace:^"
     "@blueprintjs/select": "workspace:^"
     "@blueprintjs/test-commons": "workspace:^"
-    "@types/lodash": "npm:~4.14.202"
     classnames: "npm:^2.3.1"
     date-fns: "npm:^2.28.0"
     date-fns-tz: "npm:^2.0.0"
     enzyme: "npm:^3.11.0"
     karma: "npm:^6.4.2"
-    lodash: "npm:^4.17.21"
     mocha: "npm:^10.2.0"
     npm-run-all: "npm:^4.1.5"
     react: "npm:^16.14.0"