diff --git a/.github/workflows/run_tests.yml b/.github/workflows/run_tests.yml
index 0addcf1..5f39b26 100644
--- a/.github/workflows/run_tests.yml
+++ b/.github/workflows/run_tests.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false # show all errors for each platform (vs. cancel jobs on error)
       matrix:
-        os: [ubuntu-latest] #, macos-latest] # TODO: bring back Windows
+        os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
 #      - name: Install Linux Deps
diff --git a/test/src/tanh_approx_test.cpp b/test/src/tanh_approx_test.cpp
index f4d1ddb..dcf51e4 100644
--- a/test/src/tanh_approx_test.cpp
+++ b/test/src/tanh_approx_test.cpp
@@ -33,9 +33,9 @@ TEST_CASE ("Tanh Approx Test")
     {
         test_approx ([] (auto x)
                      { return math_approx::tanh<11> (x); },
-                     2.0e-7f,
-                     3.5e-7f,
-                     5);
+                     2.5e-7f,
+                     4.0e-7f,
+                     7);
     }
     SECTION ("9th-Order")
     {
@@ -43,7 +43,7 @@ TEST_CASE ("Tanh Approx Test")
                      { return math_approx::tanh<9> (x); },
                      1.5e-6f,
                      1.5e-6f,
-                     18);
+                     20);
     }
     SECTION ("7th-Order")
     {
@@ -51,7 +51,7 @@ TEST_CASE ("Tanh Approx Test")
                      { return math_approx::tanh<7> (x); },
                      1.5e-5f,
                      1.5e-5f,
-                     226);
+                     230);
     }
     SECTION ("5th-Order")
     {