diff --git a/CHANGELOG.md b/CHANGELOG.md
index a6e13e46..703e0f92 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # History of changes
 
+## Version 2.2.3 (in development)
+
+### Bug fixes
+
+* [Issue 274](https://github.com/MassimoCimmino/pygfunction/issues/274) - Fixed scalar assignment from ndim-1 array. It is deprecated as of `numpy` version `1.25`. Only ndim-0 arrays can be treated as scalars.
+
 ## Version 2.2.2 (2023-01-09)
 
 ### Enhancements
diff --git a/pygfunction/pipes.py b/pygfunction/pipes.py
index d6476346..5a93d086 100644
--- a/pygfunction/pipes.py
+++ b/pygfunction/pipes.py
@@ -2259,7 +2259,7 @@ def update_thermal_resistances(self, R_ff, R_fp):
         # Outer pipe to borehole wall thermal resistance
         R_fg = thermal_resistances(
             self.pos, self.r_out[self._iOuter], self.b.r_b, self.k_s, self.k_g,
-            R_fp, J=self.J)[1][0]
+            R_fp, J=self.J)[1][0,0]
         # Delta-circuit thermal resistances
         self._Rd = np.zeros((2*self.nPipes, 2*self.nPipes))
         self._Rd[self._iInner, self._iInner] = np.inf