diff --git a/README-airt.md b/README-airt.md
index 9df192c5..9786ec87 100644
--- a/README-airt.md
+++ b/README-airt.md
@@ -85,7 +85,7 @@ install gr-iqtlabs
 $ git clone https://github.com/google/flatbuffers -b v23.5.26
 $ git clone https://github.com/nlohmann/json -b v3.11.2
 $ git clone https://github.com/deepsig/libsigmf -b v1.0.2
-$ git clone https://github.com/iqtlabs/gr-iqtlabs -b 1.0.37
+$ git clone https://github.com/iqtlabs/gr-iqtlabs -b 1.0.39
 $ mkdir -p flatbuffers/build && cd flatbuffers/build && cmake -DCMAKE_INSTALL_PREFIX=~/.conda/envs/$CONDA_DEFAULT_ENV .. && make -j $(nproc) && make install && cd ../..
 $ mkdir -p json/build && cd json/build && cmake -DCMAKE_INSTALL_PREFIX=~/.conda/envs/$CONDA_DEFAULT_ENV .. && make -j $(nproc) && make install && cd ../..
 $ mkdir -p libsigmf/build && cd libsigmf/build && cmake -DUSE_SYSTEM_JSON=ON -DUSE_SYSTEM_FLATBUFFERS=ON -DCMAKE_INSTALL_PREFIX=~/.conda/envs/$CONDA_DEFAULT_ENV -DCMAKE_CXX_FLAGS="-I $HOME/.conda/envs/$CONDA_DEFAULT_ENV/include" .. && make -j $(nproc) && make install && cd ../..
@@ -110,7 +110,7 @@ $ pip3 install .
 run gamutrf (may need to change sample rate depending on SDR - e.g. 125e6 or 100e6).
 
 ```
-$ LD_PRELOAD=$HOME/.conda/envs/$CONDA_DEFAULT_ENV/lib/libgomp.so.1 gamutrf-scan --sdr=SoapyAIRT --freq-start=300e6 --freq-end=6e9 --tune-step-fft 1024 --samp-rate=100e6 --nfft 256
+$ LD_PRELOAD=$HOME/.conda/envs/$CONDA_DEFAULT_ENV/lib/libgomp.so.1 gamutrf-scan --sdr=SoapyAIRT --freq-start=300e6 --freq-end=6e9 --tune-step-fft 256 --samp-rate=100e6 --nfft 256
 ```
 
 gamutrf-scan will repeatedly print
diff --git a/docker/Dockerfile.base b/docker/Dockerfile.base
index f3f4531b..e652eed5 100644
--- a/docker/Dockerfile.base
+++ b/docker/Dockerfile.base
@@ -81,7 +81,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   libvulkan-dev \
   python3-numpy
 WORKDIR /root
-RUN git clone https://github.com/iqtlabs/gr-iqtlabs -b 1.0.38
+RUN git clone https://github.com/iqtlabs/gr-iqtlabs -b 1.0.39
 COPY --from=iqtlabs/gamutrf-vkfft:latest /root /root/gr-iqtlabs
 WORKDIR /root/gr-iqtlabs/build
 COPY --from=sigmf-builder /usr/local /usr/local