diff --git a/csfieldguide/static/interactives/algorithm-timer/package-lock.json b/csfieldguide/static/interactives/algorithm-timer/package-lock.json
index 0cd62ed21..0de7f4f98 100644
--- a/csfieldguide/static/interactives/algorithm-timer/package-lock.json
+++ b/csfieldguide/static/interactives/algorithm-timer/package-lock.json
@@ -8,13 +8,13 @@
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@@ -109,9 +109,9 @@
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@@ -142,15 +142,15 @@
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                 "escape-latex": "^1.2.0",
-                "fraction.js": "4.3.4",
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diff --git a/csfieldguide/static/interactives/algorithm-timer/package.json b/csfieldguide/static/interactives/algorithm-timer/package.json
index 694e197e0..e1e3c2a13 100644
--- a/csfieldguide/static/interactives/algorithm-timer/package.json
+++ b/csfieldguide/static/interactives/algorithm-timer/package.json
@@ -3,6 +3,6 @@
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     "private": true,
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+        "mathjs": "13.0.0"
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