diff --git a/.github/workflows/nim_test.yml b/.github/workflows/nim_test.yml
index 4718657..ed16ec3 100644
--- a/.github/workflows/nim_test.yml
+++ b/.github/workflows/nim_test.yml
@@ -20,7 +20,7 @@ jobs:
           - macos-latest
           - windows-latest
         nim-version:
-          - '2.0.8'
+          - '2.2.2'
 
     steps:
       - uses: actions/checkout@v4
diff --git a/maths/modular_inverse.nim b/maths/modular_inverse.nim
index 234cb2a..170c1dd 100644
--- a/maths/modular_inverse.nim
+++ b/maths/modular_inverse.nim
@@ -56,15 +56,15 @@ when isMainModule:
         check modularInverse(tc.a, tc.modulus).get() == tc.inv
 
     test "No inverse when modulus is 1":
-      check modularInverse(0, 1).is_none()
-      check modularInverse(1, 1).is_none()
-      check modularInverse(-1, 1).is_none()
+      check modularInverse(0, 1).isNone()
+      check modularInverse(1, 1).isNone()
+      check modularInverse(-1, 1).isNone()
 
     test "No inverse when inputs are not co-prime":
-      check modularInverse(2, 4).is_none()
-      check modularInverse(-5, 25).is_none()
-      check modularInverse(0, 17).is_none()
-      check modularInverse(17, 17).is_none()
+      check modularInverse(2, 4).isNone()
+      check modularInverse(-5, 25).isNone()
+      check modularInverse(0, 17).isNone()
+      check modularInverse(17, 17).isNone()
 
     randomize()
     const randomTestSize = 10