diff --git a/package-lock.json b/package-lock.json
index 42d89721..77013ed8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "moment-of-symmetry": "^0.4.2",
-        "xen-dev-utils": "^0.6.1"
+        "xen-dev-utils": "^0.7.0"
       },
       "bin": {
         "sonic-weave": "bin/sonic-weave.js"
@@ -4444,9 +4444,9 @@
       }
     },
     "node_modules/xen-dev-utils": {
-      "version": "0.6.1",
-      "resolved": "https://registry.npmjs.org/xen-dev-utils/-/xen-dev-utils-0.6.1.tgz",
-      "integrity": "sha512-smdLvCIYnAuwGiVdj67kW8kS37gwtUFBF253ukTa4V7BfVglt7HYR9r1EQTCB8FC1J8rdNY++M8TRID+YNsH4A==",
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/xen-dev-utils/-/xen-dev-utils-0.7.0.tgz",
+      "integrity": "sha512-KECBCnnHD9sh4lY0Q6+KcgKVwMBWUOGjEJ/7S8sER2L3BKciy9kLhPFB+LR3z1oQiNS/OI7lv3L4rtPEX5SPUQ==",
       "engines": {
         "node": ">=10.6.0"
       },
diff --git a/package.json b/package.json
index 7a70294d..d0ef101c 100644
--- a/package.json
+++ b/package.json
@@ -68,7 +68,7 @@
   },
   "dependencies": {
     "moment-of-symmetry": "^0.4.2",
-    "xen-dev-utils": "^0.6.1"
+    "xen-dev-utils": "^0.7.0"
   },
   "engines": {
     "node": ">=12.0.0"
diff --git a/src/monzo.ts b/src/monzo.ts
index a642c512..b59b81c1 100644
--- a/src/monzo.ts
+++ b/src/monzo.ts
@@ -1568,7 +1568,7 @@ export class TimeMonzo {
    * @returns The pitch-space half of the time monzo.
    */
   sqrt() {
-    const residual = this.residual.pow(HALF);
+    const residual = this.residual.sqrt();
     if (!residual) {
       return new TimeReal(this.timeExponent.valueOf(), this.valueOf()).sqrt();
     }