diff --git a/package-lock.json b/package-lock.json
index e736af0c1..baa91a605 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14137,9 +14137,9 @@
             }
         },
         "node_modules/true-myth": {
-            "version": "8.5.0",
-            "resolved": "https://registry.npmjs.org/true-myth/-/true-myth-8.5.0.tgz",
-            "integrity": "sha512-EkMeamfavFmcWk7K5daj9V90uQM3A4RVSiWqvhAKvdNqjsagXnTuR3+h4x8NZlo2APBqLSLxt2K7/mktP789MA==",
+            "version": "9.0.0",
+            "resolved": "https://registry.npmjs.org/true-myth/-/true-myth-9.0.0.tgz",
+            "integrity": "sha512-BxSf496poTeHyzNXqogoAjf2mjgw3VqZeIi3wzqu/c0hkKUKLOd4AeS+9Zn1XbzBCOb2OH2en/AtkD6l9/wZlQ==",
             "license": "MIT",
             "engines": {
                 "node": "18.* || >= 20.*"
@@ -15086,7 +15086,7 @@
                 "commander": "^13.1.0",
                 "glob": "^11.0.1",
                 "langium": "^3.3.1",
-                "true-myth": "^8.5.0"
+                "true-myth": "^9.0.0"
             },
             "bin": {
                 "safe-ds": "bin/cli.js"
@@ -15132,7 +15132,7 @@
                 "@types/node": "^18.19.62",
                 "@types/ws": "^8.18.1",
                 "langium-cli": "^3.5.0",
-                "true-myth": "^8.5.0"
+                "true-myth": "^9.0.0"
             },
             "engines": {
                 "node": ">=18.0.0"
diff --git a/packages/safe-ds-cli/package.json b/packages/safe-ds-cli/package.json
index e0d8338d1..441c5beb5 100644
--- a/packages/safe-ds-cli/package.json
+++ b/packages/safe-ds-cli/package.json
@@ -45,7 +45,7 @@
         "commander": "^13.1.0",
         "glob": "^11.0.1",
         "langium": "^3.3.1",
-        "true-myth": "^8.5.0"
+        "true-myth": "^9.0.0"
     },
     "devDependencies": {
         "@types/node": "^18.19.62",
diff --git a/packages/safe-ds-lang/package.json b/packages/safe-ds-lang/package.json
index 7cd1fad55..135c58d50 100644
--- a/packages/safe-ds-lang/package.json
+++ b/packages/safe-ds-lang/package.json
@@ -57,7 +57,7 @@
         "@types/node": "^18.19.62",
         "@types/ws": "^8.18.1",
         "langium-cli": "^3.5.0",
-        "true-myth": "^8.5.0"
+        "true-myth": "^9.0.0"
     },
     "engines": {
         "node": ">=18.0.0"