diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f92ffec..b277f848 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,9 @@ will consitute of a breaking change warranting a new major release:
 
 # [unreleased]
 
+## Changed
+- STR quaternions are now used by the `MEKF` by default
+
 # [v8.1.1] 2024-06-05
 
 ## Added
diff --git a/mission/controller/acs/AcsParameters.h b/mission/controller/acs/AcsParameters.h
index 4ed80e83..eab708e5 100644
--- a/mission/controller/acs/AcsParameters.h
+++ b/mission/controller/acs/AcsParameters.h
@@ -949,7 +949,7 @@ class AcsParameters : public HasParametersIF {
     double sensorNoiseGyrArw = 3. * 0.0043 / sqrt(10) * DEG2RAD;  // Angular Random Walk
     double sensorNoiseGyrBs = 3. / 3600. * DEG2RAD;               // Bias Stability
 
-    uint8_t allowStr = false;
+    uint8_t allowStr = true;
   } kalmanFilterParameters;
 
   struct MagnetorquerParameter {