diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ada2439..af0017d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,13 +18,14 @@ env:
 jobs:
 
   build:
-    name: Build
+    name: Build (${{ matrix.platform }}, Go ${{ matrix.go-version }}, Python ${{ matrix.python-version }})
     strategy:
       fail-fast: false
       matrix:
         # TODO: Consider official support matrix (OS and Go versions) and adjust this matrix accordingly
         go-version: [1.25.x, 1.24.x, 1.23.x, 1.22.x]
         platform: [ubuntu-latest, windows-latest, macos-15]
+        python-version: ['3.11', '3.12']
     runs-on: ${{ matrix.platform }}
     steps:
     - name: Checkout code
@@ -33,7 +34,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: '3.11'
+        python-version: ${{ matrix.python-version }}
 
     - name: Install Go
       uses: actions/setup-go@v5
diff --git a/bind/gen.go b/bind/gen.go
index f6d8604..fe96bd6 100644
--- a/bind/gen.go
+++ b/bind/gen.go
@@ -194,7 +194,10 @@ func boolPyToGo(b C.char) bool {
 }
 
 func complex64GoToPy(c complex64) *C.PyObject {
-	return C.PyComplex_FromDoubles(C.double(real(c)), C.double(imag(c)))
+	gstate := C.PyGILState_Ensure()
+	obj := C.PyComplex_FromDoubles(C.double(real(c)), C.double(imag(c)))
+	C.PyGILState_Release(gstate)
+	return obj
 }
 
 func complex64PyToGo(o *C.PyObject) complex64 {
@@ -203,7 +206,10 @@ func complex64PyToGo(o *C.PyObject) complex64 {
 }
 
 func complex128GoToPy(c complex128) *C.PyObject {
-	return C.PyComplex_FromDoubles(C.double(real(c)), C.double(imag(c)))
+	gstate := C.PyGILState_Ensure()
+	obj := C.PyComplex_FromDoubles(C.double(real(c)), C.double(imag(c)))
+	C.PyGILState_Release(gstate)
+	return obj
 }
 
 func complex128PyToGo(o *C.PyObject) complex128 {