diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8fb7174..e2e0527 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,8 +13,8 @@ jobs:
         os: [ubuntu-latest]
         python-version: [3.9]
     steps:
-      - uses: actions/checkout@v3
-      - uses: conda-incubator/setup-miniconda@v2
+      - uses: actions/checkout@v4
+      - uses: conda-incubator/setup-miniconda@v3
         with:
           python-version: ${{ matrix.python-version }}
           mamba-version: "*"
diff --git a/.github/workflows/pypi_upload.yml b/.github/workflows/pypi_upload.yml
index 46edc42..b358b08 100644
--- a/.github/workflows/pypi_upload.yml
+++ b/.github/workflows/pypi_upload.yml
@@ -11,13 +11,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - name: Set up Python 3.7
+      - name: Set up Python 3.9
         uses: actions/setup-python@v1
         with:
-          python-version: 3.7
+          python-version: 3.9
       - name: Install pypa/build
         run: >-
           python -m
diff --git a/pyemittance/emittance_calc.py b/pyemittance/emittance_calc.py
index 98ba5a5..1e67890 100644
--- a/pyemittance/emittance_calc.py
+++ b/pyemittance/emittance_calc.py
@@ -146,7 +146,7 @@ def get_emit(self):
 
             q = np.array(self.quad_vals[dim])
             # quad vals are passed in machine units
-            kL = kL_from_machine_value(q, self.energy)
+            kL = kL_from_machine_value(q, self.energy, self.quad_len)
 
             bs = self.beam_vals[dim]
             bs_err = self.beam_vals_err[dim]
diff --git a/pyemittance/optics.py b/pyemittance/optics.py
index dcc8456..6f87a81 100644
--- a/pyemittance/optics.py
+++ b/pyemittance/optics.py
@@ -12,7 +12,7 @@
 logger = logging.getLogger(__name__)
 
 
-def kL_from_machine_value(quad_val, energy):
+def kL_from_machine_value(quad_val, energy, quad_len):
     """
     Calculates quadrupole strength from machine value.
 
@@ -33,9 +33,9 @@ def kL_from_machine_value(quad_val, energy):
     gamma = energy / mec2
     beta = np.sqrt(1 - 1 / gamma**2)
 
-    return c_light*quad_val * 0.1 / (beta * energy) # 1/m^2
+    return c_light*quad_val * quad_len / (beta * energy) # 1/m^2
 
-def machine_value_from_kL(kL, energy):
+def machine_value_from_kL(kL, energy, quad_len):
     """
     Calculates machine value from quadrupole strength.
 
@@ -55,7 +55,7 @@ def machine_value_from_kL(kL, energy):
     """
     gamma = energy / mec2
     beta = np.sqrt(1 - 1 / gamma**2)
-    return kL * beta * energy / c_light * 10 # 1/m -> kG
+    return kL * beta * energy / c_light / quad_len # 1/m -> kG
 
 
 
diff --git a/pyemittance/simulation.py b/pyemittance/simulation.py
index 619fb11..87009a3 100644
--- a/pyemittance/simulation.py
+++ b/pyemittance/simulation.py
@@ -222,7 +222,7 @@ def initial_sigma_matrix2(self, dim=''):
         return sigma_from_twiss(emit, beta, alpha)
     
     def screen_sigma(self, dim='x'):
-        kL = kL_from_machine_value(self.quad_value, self.energy)
+        kL = kL_from_machine_value(self.quad_value, self.energy, self.Lquad)
         sigma0 = self.initial_sigma_matrix2(dim)
         if dim == 'x':
             sign = 1