diff --git a/Makefile b/Makefile
index e1034c495..539202cf7 100644
--- a/Makefile
+++ b/Makefile
@@ -63,7 +63,8 @@ install-sf:
 	wget -qO- https://storage.googleapis.com/symbiflow-arch-defs/artifacts/prod/foss-fpga-tools/symbiflow-arch-defs/continuous/install/${F4PGA_TIMESTAMP}/symbiflow-arch-defs-install-xc7-${F4PGA_HASH}.tar.xz | tar -xJC $(SF_INSTALL)/xc7/install
 	wget -qO- https://storage.googleapis.com/symbiflow-arch-defs/artifacts/prod/foss-fpga-tools/symbiflow-arch-defs/continuous/install/${F4PGA_TIMESTAMP}/symbiflow-arch-defs-xc7a50t_test-${F4PGA_HASH}.tar.xz | tar -xJC $(SF_INSTALL)/xc7/install
 	wget -qO- https://storage.googleapis.com/symbiflow-arch-defs/artifacts/prod/foss-fpga-tools/symbiflow-arch-defs/continuous/install/${F4PGA_TIMESTAMP}/symbiflow-arch-defs-xc7a100t_test-${F4PGA_HASH}.tar.xz | tar -xJC $(SF_INSTALL)/xc7/install
-	wget -qO- https://storage.googleapis.com/symbiflow-arch-defs/artifacts/prod/foss-fpga-tools/symbiflow-arch-defs/continuous/install/${F4PGA_TIMESTAMP}/symbiflow-arch-defs-xc7a200t_test-${F4PGA_HASH}.tar.xz | tar -xJC $(SF_INSTALL)/xc7/install
+# Uncomment the following line to enable xc7a200t
+#	wget -qO- https://storage.googleapis.com/symbiflow-arch-defs/artifacts/prod/foss-fpga-tools/symbiflow-arch-defs/continuous/install/${F4PGA_TIMESTAMP}/symbiflow-arch-defs-xc7a200t_test-${F4PGA_HASH}.tar.xz | tar -xJC $(SF_INSTALL)/xc7/install
 	$(MAKE) USE_SYMBIFLOW=1 env
 	@echo
 	@echo "Done installing SymbiFlow.  To enter the environment, type 'make enter-sf', which creates a new subshell, and 'exit' when done."
diff --git a/conf/environment-symbiflow.yml b/conf/environment-symbiflow.yml
index 43ee6b615..ca2f3b706 100644
--- a/conf/environment-symbiflow.yml
+++ b/conf/environment-symbiflow.yml
@@ -12,7 +12,8 @@ dependencies:
   - litex-hub::nextpnr-nexus
   - litex-hub::nextpnr-ecp5
   - litex-hub::nextpnr-ice40
-  - litex-hub::yosys
+# Temporarily pin Yosys until symbiflow-yosys-plugins catches up
+  - litex-hub::yosys=0.33_11_g31ee566ec=20230724_080446_py37
   - litex-hub::iceprog
   - litex-hub::prjxray-tools
   - litex-hub::prjxray-db
diff --git a/conf/environment.yml b/conf/environment.yml
index f916b75d7..b725ed6a6 100644
--- a/conf/environment.yml
+++ b/conf/environment.yml
@@ -12,7 +12,8 @@ dependencies:
   - litex-hub::nextpnr-ecp5
   - litex-hub::nextpnr-ice40
   - litex-hub::iceprog
-  - litex-hub::yosys
+# Temporarily pin Yosys until symbiflow-yosys-plugins catches up
+  - litex-hub::yosys=0.33_11_g31ee566ec=20230724_080446_py37
   - litex-hub::symbiflow-yosys-plugins
   - libevent
   - json-c