diff --git a/.github/workflows/chipyard-full-flow.yml b/.github/workflows/chipyard-full-flow.yml
index 128fa1637a..57f26b761e 100644
--- a/.github/workflows/chipyard-full-flow.yml
+++ b/.github/workflows/chipyard-full-flow.yml
@@ -98,6 +98,7 @@ jobs:
           source env.sh
           cd sims/verilator
           make verilog
+
       - name: VLSI test
         run: |
           cd ${{ env.REMOTE_WORK_DIR }}
@@ -106,20 +107,23 @@ jobs:
 
           cd vlsi
 
+          # remove extra channels if put in by default (avoid clashing deps)
+          conda config --remove channels litex-hub || true
+          conda config --remove channels defaults || true
+
           # NOTE: most conda installs are in separate conda envs because they mess up
           #   each other's versions (for no apparent reason) and we need the latest versions
-          conda config --add channels defaults
-          conda config --add channels litex-hub
 
           # installs for example-sky130.yml
-          conda create -y --prefix ./.conda-sky130 open_pdks.sky130a=1.0.457_0_g32e8f23
+          conda create -y --prefix ./.conda-sky130   -c defaults -c litex-hub open_pdks.sky130a=1.0.457_0_g32e8f23
           git clone https://github.com/rahulk29/sram22_sky130_macros.git
+          git -C sram22_sky130_macros checkout 1f20d16
 
           # installs for example-openroad.yml
-          conda create -y --prefix ./.conda-yosys yosys=0.27_4_gb58664d44
-          conda create -y --prefix ./.conda-openroad openroad=2.0_7070_g0264023b6
-          conda create -y --prefix ./.conda-klayout klayout=0.28.5_98_g87e2def28
-          conda create -y --prefix ./.conda-signoff magic=8.3.376_0_g5e5879c netgen=1.5.250_0_g178b172
+          conda create -y --prefix ./.conda-yosys    -c defaults -c litex-hub yosys=0.27_4_gb58664d44
+          conda create -y --prefix ./.conda-openroad -c defaults -c litex-hub openroad=2.0_7070_g0264023b6
+          conda create -y --prefix ./.conda-klayout  -c defaults -c litex-hub klayout=0.28.5_98_g87e2def28
+          conda create -y --prefix ./.conda-signoff  -c defaults -c litex-hub magic=8.3.376_0_g5e5879c netgen=1.5.250_0_g178b172
 
           echo "# Tutorial configs" > tutorial.yml
           echo "# pdk" > tutorial.yml
@@ -138,9 +142,6 @@ jobs:
           echo "par.openroad.timing_driven: false" >> tutorial.yml
           echo "par.openroad.write_reports: false" >> tutorial.yml
 
-          conda config --remove channels litex-hub
-          conda config --remove channels defaults
-
           export tutorial=sky130-openroad
           export EXTRA_CONFS=tutorial.yml
           export VLSI_TOP=RocketTile