diff --git a/packages/squiggle-lang/package.json b/packages/squiggle-lang/package.json
index 2ba09ab6..d912f208 100644
--- a/packages/squiggle-lang/package.json
+++ b/packages/squiggle-lang/package.json
@@ -37,6 +37,7 @@
     "pdfast": "^0.2.0",
     "rationale": "0.2.0",
     "rescript": "^9.1.4",
+    "rescript-fast-check": "^1.1.1",
     "@glennsl/rescript-jest": "^0.9.0",
     "@istanbuljs/nyc-config-typescript": "^1.0.2",
     "@types/jest": "^27.4.0",
diff --git a/yarn.lock b/yarn.lock
index 9ed487a8..b4c753b5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -8479,6 +8479,13 @@ fast-check@2.24.0:
   dependencies:
     pure-rand "^5.0.1"
 
+fast-check@^2.17.0:
+  version "2.25.0"
+  resolved "https://registry.yarnpkg.com/fast-check/-/fast-check-2.25.0.tgz#5146601851bf3be0953bd17eb2b7d547936c6561"
+  integrity sha512-wRUT2KD2lAmT75WNIJIHECawoUUMHM0I5jrlLXGtGeqmPL8jl/EldUDjY1VCp6fDY8yflyfUeIOsOBrIbIiArg==
+  dependencies:
+    pure-rand "^5.0.1"
+
 fast-deep-equal@^3.1.1, fast-deep-equal@^3.1.3, fast-deep-equal@~3.1.3:
   version "3.1.3"
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz#3a7d56b559d6cbc3eb512325244e619a65c6c525"
@@ -14970,6 +14977,13 @@ requires-port@^1.0.0:
   resolved "https://registry.yarnpkg.com/requires-port/-/requires-port-1.0.0.tgz#925d2601d39ac485e091cf0da5c6e694dc3dcaff"
   integrity sha1-kl0mAdOaxIXgkc8NpcbmlNw9yv8=
 
+rescript-fast-check@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/rescript-fast-check/-/rescript-fast-check-1.1.1.tgz#ef153cb01254b2f01a738faf85b73327d423d5e1"
+  integrity sha512-wxeW0TsL/prkRvEYGbhEiLaLKmYJaECyDcKEWh65hDqP2i76lARzVW3QmYujSYK4OnjAC70dln3X6UC/2m2Huw==
+  dependencies:
+    fast-check "^2.17.0"
+
 rescript@^9.1.4:
   version "9.1.4"
   resolved "https://registry.yarnpkg.com/rescript/-/rescript-9.1.4.tgz#1eb126f98d6c16942c0bf0df67c050198e580515"