diff --git a/opus b/opus
index f6f8487..82ac57d 160000
--- a/opus
+++ b/opus
@@ -1 +1 @@
-Subproject commit f6f8487b76f234437e7d4c2831e630d9d06cb074
+Subproject commit 82ac57d9f1aaf575800cf17373348e45b7ce6c0d
diff --git a/opus.mk b/opus.mk
index ca928ce..5b2b620 100644
--- a/opus.mk
+++ b/opus.mk
@@ -55,6 +55,7 @@ OPUS_SOURCE := \
     $(OPUS_DIR)/silk/lin2log.c \
     $(OPUS_DIR)/silk/log2lin.c \
     $(OPUS_DIR)/silk/LPC_analysis_filter.c \
+    $(OPUS_DIR)/silk/LPC_fit.c \
     $(OPUS_DIR)/silk/LPC_inv_pred_gain.c \
     $(OPUS_DIR)/silk/LP_variable_cutoff.c \
     $(OPUS_DIR)/silk/NLSF2A.c \
@@ -114,14 +115,12 @@ OPUS_SOURCE := \
     $(OPUS_DIR)/silk/fixed/LTP_scale_ctrl_FIX.c \
     $(OPUS_DIR)/silk/fixed/noise_shape_analysis_FIX.c \
     $(OPUS_DIR)/silk/fixed/pitch_analysis_core_FIX.c \
-    $(OPUS_DIR)/silk/fixed/prefilter_FIX.c \
     $(OPUS_DIR)/silk/fixed/process_gains_FIX.c \
     $(OPUS_DIR)/silk/fixed/regularize_correlations_FIX.c \
     $(OPUS_DIR)/silk/fixed/residual_energy16_FIX.c \
     $(OPUS_DIR)/silk/fixed/residual_energy_FIX.c \
     $(OPUS_DIR)/silk/fixed/schur64_FIX.c \
     $(OPUS_DIR)/silk/fixed/schur_FIX.c \
-    $(OPUS_DIR)/silk/fixed/solve_LS_FIX.c \
     $(OPUS_DIR)/silk/fixed/vector_ops_FIX.c \
     $(OPUS_DIR)/silk/fixed/warped_autocorrelation_FIX.c \
     $(OPUS_DIR)/src/analysis.c \